{"id":11146,"date":"2026-06-02T01:47:14","date_gmt":"2026-06-02T01:47:14","guid":{"rendered":"https:\/\/nylonplastic.com\/delrin-vs-acetal-comparison-guide\/"},"modified":"2026-06-03T02:48:33","modified_gmt":"2026-06-03T02:48:33","slug":"delrin-vs-acetal-comparison-guide","status":"publish","type":"post","link":"https:\/\/nylonplastic.com\/ar\/delrin-vs-acetal-comparison-guide\/","title":{"rendered":"Delrin vs Acetal: Complete Comparison Guide for Precision Parts"},"content":{"rendered":"<figure style=\"margin:0 0 2rem 0;text-align:center;\">\n  <img decoding=\"async\" src=\"https:\/\/nylonplastic.com\/wp-content\/uploads\/2026\/06\/delrin-vs-acetal-hero.png\" \n       alt=\"CNC machined Delrin gear next to injection molded acetal valve body \u2014 side-by-side engineering comparison\" \n       style=\"width:100%;max-width:1200px;height:auto;border-radius:8px;\" title=\"Delrin vs Acetal: Complete Comparison Guide for Precision Parts\"><figcaption style=\"font-size:0.9em;color:#666;margin-top:0.5rem;\">\n    CNC machined precision gear (left) vs injection molded valve body (right) \u2014 two common outcomes of the Delrin vs acetal material decision.<br \/>\n  <\/figcaption><\/figure>\n<p><strong>Quick answer for engineers and procurement teams:<\/strong> Delrin is DuPont&#8217;s registered brand name for acetal homopolymer (POM-H). When a drawing specifies &#8220;acetal&#8221; without qualification, suppliers may supply either homopolymer or copolymer (POM-C) \u2014 and the two behave differently enough to cause field failures. For tight-tolerance CNC gears, high-cycle fatigue applications, and parts requiring the best surface finish out of the machine \u2014 choose Delrin homopolymer. For applications involving hot water, acidic environments, or large-diameter turned parts where centerline porosity would be a problem \u2014 choose acetal copolymer.<\/p>\n<p>This guide is written for engineers who need to <strong>specify the right material on the PO<\/strong>, not just understand the chemistry. We draw on machining data from over 500 industrial acetal parts produced at our facility, across both grades and three manufacturing processes.<\/p>\n<figure style=\"margin:2rem 0;text-align:center;\">\n  <img decoding=\"async\" src=\"https:\/\/nylonplastic.com\/wp-content\/uploads\/2026\/06\/delrin-vs-acetal-properties-chart.png\" \n       alt=\"Mechanical properties comparison chart for Delrin homopolymer vs acetal copolymer\" \n       style=\"width:100%;max-width:800px;border-radius:8px;\" title=\"Delrin vs Acetal: Complete Comparison Guide for Precision Parts\"><figcaption style=\"font-size:0.9em;color:#666;margin-top:0.5rem;\">\n    Key mechanical property differences visualized \u2014 note the ~20% gap in fatigue endurance.<br \/>\n  <\/figcaption><\/figure>\n<h2>Material Basics: Homopolymer vs Copolymer \u2014 What Changes on the Shop Floor<\/h2>\n<p>Both grades belong to the polyoxymethylene (POM) family, but their molecular structure differs at a level that affects every downstream process:<\/p>\n<ul>\n<li><strong>Delrin (POM-H):<\/strong> Uniform repeating -CH2O- units. Higher crystallinity (~75-85%) means harder, stiffer, better fatigue resistance \u2014 but also higher residual stress after machining.<\/li>\n<li><strong>Acetal Copolymer (POM-C):<\/strong> Contains occasional -CH2CH2O- co-monomer units that interrupt crystallinity. This reduces stiffness slightly but dramatically improves chemical resistance and dimensional stability after machining.<\/li>\n<\/ul>\n<h3>Head-to-Head Property Comparison<\/h3>\n<table style=\"width:100%;border-collapse:collapse;margin:1.5rem 0;\">\n<thead>\n<tr style=\"background:#2c6fbb;color:#fff;\">\n<th style=\"padding:10px;border:1px solid #ddd;\">\u0627\u0644\u0645\u0645\u062a\u0644\u0643\u0627\u062a<\/th>\n<th style=\"padding:10px;border:1px solid #ddd;\">Delrin (POM-H)<\/th>\n<th style=\"padding:10px;border:1px solid #ddd;\">Acetal Copolymer (POM-C)<\/th>\n<th style=\"padding:10px;border:1px solid #ddd;\">Why It Matters<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">\u0642\u0648\u0629 \u0627\u0644\u0634\u062f (\u0645\u064a\u062c\u0627 \u0628\u0627\u0633\u0643\u0627\u0644)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">70-83<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">60-69<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Delrin handles ~20% higher static load before yield<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">\u0645\u0639\u0627\u0645\u0644 \u0627\u0644\u0627\u0646\u062b\u0646\u0627\u0621 (\u062c\u064a\u062c\u0627 \u0628\u0627\u0633\u0643\u0627\u0644)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">2.8-3.1<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">2.4-2.8<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Stiffer feel \u2014 critical for snap-fit retention force<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Fatigue Endurance @10&#038;sup6; cycles (MPa)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">35<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">28<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\"><strong>Key differentiator for gears and springs<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Izod Impact, Notched (J\/m @23&deg;C)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">69-122<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">53-163<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Copolymer has wider range; grade selection matters<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Water Absorption, 24h (%)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">0.25<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">0.22<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Similar at room temp; diverges above 60&deg;C<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Continuous Service Temp, Max (&deg;C)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">90-100<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">100-110<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Copolymer wins for hot environments<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Creep Strain after 1000h @23&deg;C, 10MPa (%)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">~0.5<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">~0.8<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Delrin holds dimension better under constant load<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Coefficient of Friction (dry vs steel)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">0.2-0.35<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">0.25-0.40<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Delrin is slightly more slippery \u2014 better for bearings<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Design Rules for Delrin and Acetal Parts<\/h2>\n<p>These rules come directly from our CNC machining cell and apply equally to prototype quantities and production runs. Adapt them for molding by adding draft angles (1-2&deg; minimum for both materials).<\/p>\n<div style=\"background:#f8f9fa;border-left:4px solid #2c6fbb;padding:1.2rem 1.5rem;margin:1.8rem 0;border-radius:6px;\">\n<h3 style=\"margin-top:0;color:#1a5276;\">Design Rules for Acetal Parts (from the Shop Floor)<\/h3>\n<p>Based on machining data from 500+ industrial acetal parts produced at our facility (Q1 2026). Apply these directly in your CAD drawings.<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:1rem 0;font-size:0.95em;\">\n<thead>\n<tr style=\"background:#2c6fbb;color:#fff;\">\n<th style=\"padding:10px;border:1px solid #ddd;\">\u0627\u0644\u0645\u0639\u0644\u0645\u0629<\/th>\n<th style=\"padding:10px;border:1px solid #ddd;\">Delrin (POM-H)<\/th>\n<th style=\"padding:10px;border:1px solid #ddd;\">Acetal Copolymer (POM-C)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Minimum wall thickness<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">1.0 \u0645\u0645<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">0.8 mm<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Recommended corner radius<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">R &ge; 0.5 mm<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">R &ge; 0.3 mm<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Hole diameter tolerance (CNC)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">&plusmn;0.025 mm<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">&plusmn;0.05 mm<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Maximum aspect ratio (depth\/dia)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">6:1<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">5:1<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Surface finish as-machined (Ra)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">0.8 &mu;m<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">1.2 &mu;m<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Post-machining warpage risk<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Moderate (stress relief recommended)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Low (better dimensional stability)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"margin:0.8rem 0 0 0;font-size:0.9em;color:#666;\">These values assume standard machining conditions at 20&deg;C, sharp carbide tooling, and dry cutting. For injection molding design rules, refer to our <a href=\"\/ar\/contact-us\/\">engineering team consultation<\/a>.<\/p>\n<\/div>\n<h3>Why Centerline Porosity Changes Part Design<\/h3>\n<p>One of the least-discussed differences between the two materials is centerline porosity in Delrin extruded rod. As the rod diameter increases beyond 40 mm, POM-H extrusion typically develops a porous center core (0.5-2 mm diameter) due to shrinkage during cooling. If your part design places a critical sealing surface or tight-tolerance bore on the rod centerline, this porosity causes leaks or out-of-spec bores. Copolymer does not have this problem \u2014 the co-monomer disrupts crystallization enough to eliminate centerline voids.<\/p>\n<p><strong>Practical rule:<\/strong> If your part has a through-hole or sealing surface passing through the rod center and the rod diameter exceeds 40 mm, specify acetal copolymer. One customer saved 18% on a returned batch for a water valve component by making this single material switch.<\/p>\n<figure style=\"margin:2rem 0;text-align:center;\">\n  <img decoding=\"async\" src=\"https:\/\/nylonplastic.com\/wp-content\/uploads\/2026\/06\/delrin-cnc-machining-setup-1.webp\" \n       alt=\"CNC machining setup for Delrin gear blank with carbide tooling\" \n       style=\"width:100%;max-width:800px;border-radius:8px;\" title=\"Delrin vs Acetal: Complete Comparison Guide for Precision Parts\"><figcaption style=\"font-size:0.9em;color:#666;margin-top:0.5rem;\">\n    CNC machining a Delrin gear blank. Sharp carbide tooling at 5,000-8,000 RPM produces the best surface finish without melting.<br \/>\n  <\/figcaption><\/figure>\n<h2>Industry Applications: Where Each Grade Wins<\/h2>\n<table style=\"width:100%;border-collapse:collapse;margin:1.5rem 0;\">\n<thead>\n<tr style=\"background:#2c6fbb;color:#fff;\">\n<th style=\"padding:10px;border:1px solid #ddd;\">\u0627\u0644\u0635\u0646\u0627\u0639\u0629<\/th>\n<th style=\"padding:10px;border:1px solid #ddd;\">Typical Parts<\/th>\n<th style=\"padding:10px;border:1px solid #ddd;\">Preferred Grade<\/th>\n<th style=\"padding:10px;border:1px solid #ddd;\">Selection Rationale<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">\u0627\u0644\u0633\u064a\u0627\u0631\u0627\u062a<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Fuel system valves, seat belt components, window regulator gears<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Delrin (POM-H)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Higher fatigue strength for 100k+ cycle durability; low fuel permeability<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">\u0627\u0644\u0623\u062c\u0647\u0632\u0629 \u0627\u0644\u0637\u0628\u064a\u0629<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Inhaler mechanisms, insulin pen bodies, surgical instrument handles<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Acetal Copolymer (POM-C)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Better resistance to sterilization chemicals; lower extractables<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">\u0627\u0644\u0622\u0644\u0627\u062a \u0627\u0644\u0635\u0646\u0627\u0639\u064a\u0629<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Conveyor rollers, bearing cages, pump impellers, wear strips<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Delrin (POM-H)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Superior wear resistance and low friction (self-lubricating); higher hardness<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">\u0627\u0644\u0625\u0644\u0643\u062a\u0631\u0648\u0646\u064a\u0627\u062a \u0627\u0644\u0627\u0633\u062a\u0647\u0644\u0627\u0643\u064a\u0629<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Keyboard mechanisms, printer gears, camera lens barrels<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Acetal Copolymer (POM-C)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Better hot water resistance for dishwasher-safe applications; lower creep under constant spring load<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Plumbing &#038; Fluid Handling<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Valve seats, shower mixer components, water meter internals<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Acetal Copolymer (POM-C)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Lower hot water swelling; avoids centerline porosity issues that can cause leaks in POM-H<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Food Processing<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Filling nozzles, conveyor guides, cutting board liners<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Both (FDA-compliant grades)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Use homopolymer for dry-contact apps; copolymer for wet\/hot-contact per NSF 51<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The pattern is clear: Delrin dominates in dynamic mechanical applications (gears, bearings, springs) where fatigue life and low friction are primary requirements. Acetal copolymer dominates in applications involving fluids, chemicals, or sterilization \u2014 and anywhere the part geometry makes centerline porosity risky.<\/p>\n<h2>Tolerance Comparison by Manufacturing Process<\/h2>\n<p>The achievable tolerance depends as much on the manufacturing process as the material choice. Below is a practical reference for engineers writing drawing callouts.<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:1.5rem 0;\">\n<thead>\n<tr style=\"background:#2c6fbb;color:#fff;\">\n<th style=\"padding:10px;border:1px solid #ddd;\">\u0639\u0645\u0644\u064a\u0629 \u0627\u0644\u062a\u0635\u0646\u064a\u0639<\/th>\n<th style=\"padding:10px;border:1px solid #ddd;\">Delrin (POM-H) Tolerance<\/th>\n<th style=\"padding:10px;border:1px solid #ddd;\">Acetal Copolymer (POM-C) Tolerance<\/th>\n<th style=\"padding:10px;border:1px solid #ddd;\">\u0627\u0644\u0623\u0641\u0636\u0644 \u0644\u0640<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">\u0627\u0644\u062a\u0635\u0646\u064a\u0639 \u0627\u0644\u0622\u0644\u064a \u0628\u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0627\u0644\u062d\u0627\u0633\u0628 \u0627\u0644\u0622\u0644\u064a<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">&plusmn;0.025 mm<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">&plusmn;0.05 mm<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Prototypes, low-mid volume (&lt;1,000 pcs), tight-tolerance parts<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">\u0627\u0644\u0642\u0648\u0644\u0628\u0629 \u0628\u0627\u0644\u062d\u0642\u0646<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">&plusmn;0.10 mm<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">&plusmn;0.08 mm<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">High volume (&gt;5,000 pcs); copolymer molds more consistently<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">3D Printing (FDM)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">&plusmn;0.20 mm<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">&plusmn;0.15 mm<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Rapid prototypes only; not recommended for functional testing<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"font-size:0.9em;color:#666;margin-top:0.5rem;\">Tolerances are achievable under standard shop conditions. Tighter tolerances available on request with additional process controls.<\/p>\n<p>Note that copolymer&#8217;s lower post-machining stress relaxation gives it a slight tolerance advantage in injection molding \u2014 the part comes out of the mold closer to its final dimensions and drifts less over the first 72 hours.<\/p>\n<h2>Cost Decision Framework: When to Pay for Delrin<\/h2>\n<div style=\"background:#fffbe8;border:1px solid #e6d88a;padding:1.2rem 1.5rem;margin:1.5rem 0;border-radius:6px;\">\n<h3 style=\"margin-top:0;color:#8a6d00;\">Cost Decision Framework: Delrin vs Acetal Copolymer<\/h3>\n<p>Material cost is only ~15-20% of total part cost for machined components. The real difference is in process efficiency and rejection rate:<\/p>\n<ul style=\"margin:0.8rem 0;\">\n<li><strong>Raw material price:<\/strong> Delrin rod is typically 10-15% more expensive than generic acetal copolymer rod at the same diameter.<\/li>\n<li><strong>Machining time:<\/strong> Delrin cuts cleaner and faster &mdash; expect 8-12% shorter cycle time per part vs. copolymer at equivalent tolerance.<\/li>\n<li><strong>Rejection rate (internal data):<\/strong> Copolymer parts have higher visual defects (center porosity streaks) &mdash; 3-5% rejection vs. ~1% for Delrin in CNC turning operations.<\/li>\n<li><strong>Break-even point:<\/strong> If your annual volume exceeds 2,000 parts, the reduced rejection rate of Delrin offsets the raw material premium. Below 2,000, generic copolymer is more cost-effective.<\/li>\n<li><strong>Hidden cost:<\/strong> Copolymer proposed for dimensional-critical assemblies may accumulate 1-2% scrap from dimensional drift post-machining due to residual stress release over the first 72 hours.<\/li>\n<\/ul>\n<\/div>\n<p>The cost decision often comes down to a simple question: &#8220;What happens if this part fails?&#8221; For non-critical cosmetic or spacing components, copolymer saves money. For load-bearing, safety-critical, or high-cycle components, the Delrin premium pays for itself in reduced field returns.<\/p>\n<figure style=\"margin:2rem 0;text-align:center;\">\n  <img decoding=\"async\" src=\"https:\/\/nylonplastic.com\/wp-content\/uploads\/2026\/06\/delrin-vs-acetal-finish-comparison-1.webp\" \n       alt=\"Surface finish comparison of machined Delrin homopolymer vs acetal copolymer\" \n       style=\"width:100%;max-width:800px;border-radius:8px;\" title=\"Delrin vs Acetal: Complete Comparison Guide for Precision Parts\"><figcaption style=\"font-size:0.9em;color:#666;margin-top:0.5rem;\">\n    Surface finish comparison: Delrin (left) typically achieves Ra 0.8 &mu;m as-machined; copolymer (right) around Ra 1.2 &mu;m.<br \/>\n  <\/figcaption><\/figure>\n<h2>Common Defects and How to Fix Them<\/h2>\n<p>When an acetal part fails or is rejected at incoming QC, the root cause is often a material mismatch. Here are the four most frequent issues we see when customers bring parts to us for rework:<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:1.5rem 0;\">\n<thead>\n<tr style=\"background:#2c6fbb;color:#fff;\">\n<th style=\"padding:10px;border:1px solid #ddd;\">Problem<\/th>\n<th style=\"padding:10px;border:1px solid #ddd;\">Likely Material Cause<\/th>\n<th style=\"padding:10px;border:1px solid #ddd;\">Fix<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Gear tooth wear after &lt; 50k cycles<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Copolymer used where homopolymer needed (28 MPa vs 35 MPa fatigue limit)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Switch to Delrin 100 or 150 grade for gears; add PTFE-filled grade (Delrin 500AF) if unlubricated<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Surface cracking after 6+ months in service<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Environmental stress cracking from acidic environment (common in POM-H)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Switch to POM-C; verify chemical compatibility with your process fluid<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Dimensional growth in hot water application<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">POM-H absorbs more water at elevated temperature (~0.8% at 80&deg;C)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Use POM-C (0.6% absorption); pre-condition parts by soaking in 60&deg;C water for 24h before final QC<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd;\">Porosity visible on turned surfaces<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Centerline porosity &mdash; inherent to POM-H extrusion process<\/td>\n<td style=\"padding:10px;border:1px solid #ddd;\">Specify POM-C for parts with large turned diameters (&gt;50 mm); request &#8220;low-porosity&#8221; grade from supplier<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Specifying Acetal Correctly on Your Purchase Order<\/h2>\n<p>Avoid the most common procurement mistake: writing &#8220;Acetal&#8221; on the PO without specifying the grade. A correctly specified PO should include:<\/p>\n<ol>\n<li>Material family and type: &#8220;Acetal Homopolymer (Delrin 150)&#8221; or &#8220;Acetal Copolymer (equivalent to Celcon M90)&#8221;<\/li>\n<li>Form: &#8220;Extruded rod, diameter 50 mm&#8221; or &#8220;Injection molding pellets&#8221;<\/li>\n<li>Tolerance requirement: &#8220;Per ISO 2768-m&#8221; or specific callout<\/li>\n<li>Any special grade requirements: &#8220;FDA-compliant,&#8221; &#8220;UV-stabilized (Delrin 527),&#8221; &#8220;PTFE-filled (Delrin 500AF)&#8221;<\/li>\n<\/ol>\n<p>This level of specificity prevents the supplier from substituting copolymer for homopolymer when the drawing only says &#8220;acetal&#8221; \u2014 a practice that is more common than most engineers realize.<\/p>\n<h2>Conclusion and Recommendations<\/h2>\n<p>The Delrin vs acetal decision is not about which material is &#8220;better&#8221; \u2014 it is about matching the right grade to the right application. Use Delrin homopolymer for dynamic mechanical parts where fatigue life, surface finish, and low friction are critical. Use acetal copolymer for fluid-contact applications, hot or chemically aggressive environments, and large-diameter turned parts where centerline porosity is a risk.<\/p>\n<p>Still unsure which grade fits your design? Our engineering team reviews material selection as part of every quote. Send your drawing or 3D file and we will recommend the optimal grade for your application at no charge.<\/p>\n<div style=\"display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;margin:2rem 0;text-align:center;\">\n<div style=\"padding:1rem;background:#f8f9fa;border-radius:8px;\">\n<div style=\"font-size:2rem;margin-bottom:0.5rem;\">&#9881;<\/div>\n<h4 style=\"margin:0.3rem 0;font-size:0.95em;\">Precision Manufacturing<\/h4>\n<p style=\"font-size:0.85em;color:#666;margin:0;\">CNC tolerance &plusmn;0.01mm across 50+ engineering plastics<\/p>\n<\/div>\n<div style=\"padding:1rem;background:#f8f9fa;border-radius:8px;\">\n<div style=\"font-size:2rem;margin-bottom:0.5rem;\">&#x1F4CB;<\/div>\n<h4 style=\"margin:0.3rem 0;font-size:0.95em;\">ISO 9001 Certified<\/h4>\n<p style=\"font-size:0.85em;color:#666;margin:0;\">Full QC with CMM reports per order<\/p>\n<\/div>\n<div style=\"padding:1rem;background:#f8f9fa;border-radius:8px;\">\n<div style=\"font-size:2rem;margin-bottom:0.5rem;\">&#x1F4E6;<\/div>\n<h4 style=\"margin:0.3rem 0;font-size:0.95em;\">15-25 Day Delivery<\/h4>\n<p style=\"font-size:0.85em;color:#666;margin:0;\">Prototype to production, global shipping<\/p>\n<\/div>\n<div style=\"padding:1rem;background:#f8f9fa;border-radius:8px;\">\n<div style=\"font-size:2rem;margin-bottom:0.5rem;\">&#x1F30D;<\/div>\n<h4 style=\"margin:0.3rem 0;font-size:0.95em;\">Global Shipping<\/h4>\n<p style=\"font-size:0.85em;color:#666;margin:0;\">DDP available to US, EU, Asia-Pacific<\/p>\n<\/div>\n<\/div>\n<div style=\"background:#eaf2fb;border:2px solid #2c6fbb;padding:1.5rem;margin:2rem 0;border-radius:8px;text-align:center;\">\n<h3 style=\"margin-top:0;color:#2c6fbb;\">Get the Complete Engineering Plastics Machining Handbook (PDF)<\/h3>\n<p style=\"margin:0.8rem 0;\">Covers design rules, tolerance tables, and material selection guides for Delrin, Nylon, PEEK, ABS, PTFE, and 8 more engineering plastics. Based on 15+ years of machining data from our factory floor.<\/p>\n<p><a href=\"\/ar\/contact-us\/\" style=\"display:inline-block;background:#2c6fbb;color:#fff;padding:12px 32px;border-radius:6px;text-decoration:none;font-weight:600;margin-top:0.5rem;\">Download Free PDF<\/a><\/p>\n<p style=\"font-size:0.85em;color:#666;margin-top:0.8rem;\">No registration required. Updated Q1 2026.<\/p>\n<\/div>\n<div style=\"margin:2rem 0;\">\n<h3 style=\"border-left:4px solid #2c6fbb;padding-left:0.8rem;\">\u0645\u0642\u0627\u0644\u0627\u062a \u0630\u0627\u062a \u0635\u0644\u0629<\/h3>\n<ul style=\"list-style:none;padding:0;display:grid;grid-template-columns:repeat(2,1fr);gap:0.8rem;\">\n<li style=\"padding:0.5rem 0;\"><a href=\"https:\/\/nylonplastic.com\/ar\/nylon-6-vs-nylon-66-injection-molding-guide\/\" style=\"color:#2c6fbb;text-decoration:none;\">Nylon 6 vs Nylon 66: Injection Molding Selection Guide<\/a><\/li>\n<li style=\"padding:0.5rem 0;\"><a href=\"https:\/\/nylonplastic.com\/ar\/insert-molding-complete-guide\/\" style=\"color:#2c6fbb;text-decoration:none;\">Insert Molding: Complete Engineering Guide for Metal-Plastic Hybrid Parts<\/a><\/li>\n<li style=\"padding:0.5rem 0;\"><a href=\"https:\/\/nylonplastic.com\/ar\/spi-surface-finish-standards-plastic-injection-molding\/\" style=\"color:#2c6fbb;text-decoration:none;\">SPI Surface Finish Standards for Plastic Injection Molding<\/a><\/li>\n<li style=\"padding:0.5rem 0;\"><a href=\"https:\/\/nylonplastic.com\/ar\/snap-fit-design-injection-molding-guide\/\" style=\"color:#2c6fbb;text-decoration:none;\">Snap-Fit Design for Injection Molding: Complete Guide<\/a><\/li>\n<\/ul>\n<\/div>\n<h2>\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0634\u0627\u0626\u0639\u0629<\/h2>\n<details>\n<summary><strong>Can I substitute acetal copolymer for Delrin in an existing gear design without changing dimensions?<\/strong><\/summary>\n<p>Yes, with caveats. Copolymer has approximately 20% lower fatigue endurance (28 MPa vs 35 MPa at 10&#038;sup6; cycles) and slightly higher creep under constant load. For static-load gears operating under moderate torque and thin walls, direct substitution works. For high-cycle dynamic-load gears or non-lubricated bearing sleeves, expect up to 30 microns of additional radial play after the first month of operation. Dimensionally, identical tooling can be used \u2014 but if switching from homopolymer to copolymer, consider increasing wall thickness by 8-10% to compensate for lower stiffness.<\/p>\n<\/details>\n<details>\n<summary><strong>Why does my CNC machined Delrin part warp after sitting on the shelf for a week?<\/strong><\/summary>\n<p>This is residual stress release \u2014 a known characteristic of acetal homopolymer. During extrusion, the outer surface of the rod cools faster than the core, creating a stress gradient. When you machine away material asymmetrically, the stress imbalance causes warpage within 24-72 hours. Three solutions: (1) rough-machine first, let the part rest for 24 hours, then finish-machine; (2) anneal the rod at 160&deg;C for 1 hour per 25 mm of thickness before machining; (3) switch to acetal copolymer for parts with significant asymmetric material removal. We typically recommend annealing for any Delrin part where flatness or cylindricity must stay within 0.05 mm.<\/p>\n<\/details>\n<details>\n<summary><strong>Which grade performs better in hot water or steam environments?<\/strong><\/summary>\n<p>Acetal copolymer (POM-C) outperforms Delrin (POM-H) in hot water above 60&deg;C. Copolymer absorbs less water at elevated temperature (~0.6% vs ~0.8% at 80&deg;C), swells less, and is significantly more resistant to hydrolysis \u2014 the chemical breakdown of the polymer chain by water. For applications like shower mixer components, dishwasher parts, or coffee machine internals, copolymer is the standard choice. If the application also requires FDA compliance, specify a food-grade copolymer such as Celcon M25 or equivalent.<\/p>\n<\/details>\n<details>\n<summary><strong>What surface finishes are available for Delrin and acetal copolymer parts?<\/strong><\/summary>\n<p>As-machined Delrin achieves the best natural finish (Ra 0.8 &mu;m with sharp carbide tooling at 5,000-8,000 RPM). Acetal copolymer as-machined is typically Ra 1.0-1.2 &mu;m. Neither material accepts paint or plating well due to low surface energy. Bead blasting produces a uniform matte finish on both (Ra 2.0-3.0 &mu;m) and is the most common secondary finish. For a glossy appearance, flame polishing works on both grades but requires careful temperature control to avoid surface melting. 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\/><\/svg>\t\t<\/span>\n\t\t<span class=\"srfm-error-content\">\u062d\u062f\u062b \u062e\u0637\u0623 \u0623\u062b\u0646\u0627\u0621 \u0645\u062d\u0627\u0648\u0644\u0629 \u0625\u0631\u0633\u0627\u0644 \u0627\u0644\u0646\u0645\u0648\u0630\u062c \u0627\u0644\u062e\u0627\u0635 \u0628\u0643. \u064a\u0631\u062c\u0649 \u0627\u0644\u0645\u062d\u0627\u0648\u0644\u0629 \u0645\u0631\u0629 \u0623\u062e\u0631\u0649.<\/span><\/p>\n\t\t\t\t\t\t<div data-block-id=\"7fa370fa\" class=\"wp-block-uagb-advanced-heading uagb-block uagb-block-7fa370fa\" >\n\t\t\t\t\t<h2 class=\"uagb-heading-text\">\u062f\u0639\u0646\u0627 \u0646\u0635\u0645\u0645 \u0644\u0643 \u0627\u0644\u062d\u0644 \u0627\u0644\u0645\u062e\u0635\u0635 \u0644\u0643<\/h2>\t\t\t\t<\/div>\n\t\t\t\n\n\t\t\t<div data-block-id=\"bb2839a9\" class=\"srfm-block-single srfm-block srfm-input-block srf-input-bb2839a9-block  srfm-block-width-50 srfm-slug-text-field\" >\n\t\t\t\t\t\t\t\t<label id=\"srfm-label-bb2839a9-lbl-Rmlyc3QgTmFtZQ\" for=\"srfm-input-bb2839a9-lbl-Rmlyc3QgTmFtZQ\" class=\"srfm-block-label\">\n\t\t\t\t\t\t\u0627\u0644\u0627\u0633\u0645 \u0627\u0644\u0623\u0648\u0644\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"srfm-required\" aria-hidden=\"true\"> *<\/span>\n\t\t\t\t\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"srfm-block-wrap\">\n\t\t\t\t<input class=\"srfm-input-common srfm-input-input\" type=\"text\" name=\"srfm-input-bb2839a9-lbl-Rmlyc3QgTmFtZQ-text-field\" id=\"srfm-input-bb2839a9-lbl-Rmlyc3QgTmFtZQ\"\n\t\t\t\t\taria-describedby='srfm-error-bb2839a9'\t\t\t\t\tdata-required=\"true\" aria-required=\"true\" data-unique=\"false\" maxlength=\"100\" value=\"\"  data-srfm-mask=\"none\"   \/>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"srfm-error-wrap\">\n\t\t\t\t\t\t\t\t\t\t<div class=\"srfm-error-message\" data-srfm-id=\"srfm-error-bb2839a9\" data-error-msg=\"This field is required.\" data-unique-msg=\"Value needs to be unique.\">\n\t\t\t\t\t\t\u0647\u0630\u0627 \u0627\u0644\u062d\u0642\u0644 \u0645\u0637\u0644\u0648\u0628.\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\n\n\t\t\t<div data-block-id=\"dbaa04c6\" class=\"srfm-block-single srfm-block srfm-input-block srf-input-dbaa04c6-block  srfm-block-width-50 srfm-slug-last-name\" >\n\t\t\t\t\t\t\t\t<label id=\"srfm-label-dbaa04c6-lbl-TGFzdCBOYW1l\" for=\"srfm-input-dbaa04c6-lbl-TGFzdCBOYW1l\" class=\"srfm-block-label\">\n\t\t\t\t\t\t\u0627\u0644\u0627\u0633\u0645 \u0627\u0644\u0639\u0627\u0626\u0644\u064a\t\t\t\t\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"srfm-block-wrap\">\n\t\t\t\t<input class=\"srfm-input-common srfm-input-input\" type=\"text\" name=\"srfm-input-dbaa04c6-lbl-TGFzdCBOYW1l-last-name\" id=\"srfm-input-dbaa04c6-lbl-TGFzdCBOYW1l\"\n\t\t\t\t\taria-describedby='srfm-error-dbaa04c6'\t\t\t\t\tdata-required=\"false\" aria-required=\"false\" data-unique=\"false\" maxlength=\"100\" value=\"\"  data-srfm-mask=\"none\"   \/>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"srfm-error-wrap\">\n\t\t\t\t\t\t\t\t\t\t<div class=\"srfm-error-message\" data-srfm-id=\"srfm-error-dbaa04c6\" data-error-msg=\"This field is required.\" data-unique-msg=\"Value needs to be unique.\">\n\t\t\t\t\t\t\u0647\u0630\u0627 \u0627\u0644\u062d\u0642\u0644 \u0645\u0637\u0644\u0648\u0628.\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\n\n\t\t\t<div data-block-id=\"80af9bb9\" class=\"srfm-block-single srfm-block srfm-email-block srf-email-80af9bb9-block  srfm-block-width-50 srfm-slug-email srfm-email-block-wrap\">\n\t\t\t\t<div class=\"srfm-email-block srf-email-80af9bb9-block\">\n\t\t\t\t\t\t\t\t\t\t<label id=\"srfm-label-80af9bb9-lbl-RW1haWw\" for=\"srfm-email-80af9bb9-lbl-RW1haWw\" class=\"srfm-block-label\">\n\t\t\t\t\t\t\u0627\u0644\u0628\u0631\u064a\u062f \u0627\u0644\u0625\u0644\u0643\u062a\u0631\u0648\u0646\u064a\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"srfm-required\" aria-hidden=\"true\"> *<\/span>\n\t\t\t\t\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"srfm-block-wrap\">\n\t\t\t\t\t\t<input class=\"srfm-input-common srfm-input-email\" type=\"email\" name=\"srfm-email-80af9bb9-lbl-RW1haWw-email\" id=\"srfm-email-80af9bb9-lbl-RW1haWw\"\n\t\t\t\t\t\taria-describedby='srfm-error-80af9bb9'\t\t\t\t\t\tdata-required=\"true\" aria-required=\"true\" data-unique=\"false\" value=\"\"   \/>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"srfm-error-wrap\">\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"srfm-error-message\" data-srfm-id=\"srfm-error-80af9bb9\" data-error-msg=\"This field is required.\" data-unique-msg=\"Value needs to be unique.\">\n\t\t\t\t\t\t\u0647\u0630\u0627 \u0627\u0644\u062d\u0642\u0644 \u0645\u0637\u0644\u0648\u0628.\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\n\n\t\t<div data-block-id=\"0c6821ab\" class=\"srfm-block-single srfm-block srfm-phone-block srf-phone-0c6821ab-block 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data-srfm-id=\"srfm-error-0c6821ab\" data-error-msg=\"This field is required.\" data-unique-msg=\"Value needs to be unique.\">\n\t\t\t\t\t\t\u0647\u0630\u0627 \u0627\u0644\u062d\u0642\u0644 \u0645\u0637\u0644\u0648\u0628.\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\n\n\t\t<div data-block-id=\"fabb13d5\" class=\"srfm-block-single srfm-block srfm-textarea-block srf-textarea-fabb13d5-block  srfm-block-width-100\">\n\t\t\t\t\t\t\t\t<label id=\"srfm-label-fabb13d5-lbl-WW91ciBNZXNzYWdl-2827\" for=\"srfm-textarea-fabb13d5-lbl-WW91ciBNZXNzYWdl-2827\" class=\"srfm-block-label\">\n\t\t\t\t\t\t\u0631\u0633\u0627\u0644\u062a\u0643\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"srfm-required\" aria-hidden=\"true\"> *<\/span>\n\t\t\t\t\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"srfm-block-wrap\">\n\t\t\t\t<textarea\n\t\t\t\t\tclass=\"srfm-input-common 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stroke-linecap=\"round\" stroke-linejoin=\"round\" \/><path d=\"M10 13.334H10.0083\" stroke=\"currentColor\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" \/><\/svg>\t\t<\/span>\n\t\t<span class=\"srfm-error-content\">\u062d\u062f\u062b \u062e\u0637\u0623 \u0623\u062b\u0646\u0627\u0621 \u0645\u062d\u0627\u0648\u0644\u0629 \u0625\u0631\u0633\u0627\u0644 \u0627\u0644\u0646\u0645\u0648\u0630\u062c \u0627\u0644\u062e\u0627\u0635 \u0628\u0643. \u064a\u0631\u062c\u0649 \u0627\u0644\u0645\u062d\u0627\u0648\u0644\u0629 \u0645\u0631\u0629 \u0623\u062e\u0631\u0649.<\/span><\/p>\n\t\t\t\t\t<input type=\"hidden\" name=\"trp-form-language\" value=\"ar\"\/><\/form>\n\t\t\t<div class=\"srfm-single-form srfm-success-box in-page\">\n\t\t\t\t<div aria-live=\"polite\" aria-atomic=\"true\" role=\"alert\" id=\"srfm-success-message-page-305\" class=\"srfm-success-box-description\"><\/div>\n\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>CNC machined precision gear (left) vs injection molded valve body (right) \u2014 two common outcomes of the Delrin vs acetal [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":11444,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":{"facebook_846085238273622_899381133262461":""},"rop_publish_now_history":[],"rop_publish_now_status":"pending","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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