{"id":4218,"date":"2026-04-24T01:03:04","date_gmt":"2026-04-24T01:03:04","guid":{"rendered":"https:\/\/nylonplastic.com\/?p=4218"},"modified":"2026-06-17T09:08:08","modified_gmt":"2026-06-17T09:08:08","slug":"nylon-chemical-resistance-acids-bases-solvents-technical","status":"publish","type":"post","link":"https:\/\/nylonplastic.com\/fr\/nylon-chemical-resistance-acids-bases-solvents-technical\/","title":{"rendered":"R\u00e9sistance chimique du nylon : Acides, bases, solvants et autres"},"content":{"rendered":"
\"Nylon
Nylon Chemical Resistance Guide \u2014 Nylon Plastic<\/figcaption><\/figure>\n

Nylon Chemical Resistance: Acids, Bases, Solvents, Automotive Fluids, and Food Contact<\/h2>\n

Chemical resistance is the single most misunderstood property of nylon in engineering procurement. Most engineers treat “nylon” as a single material when assessing chemical compatibility, then are surprised when PA6 and PA12 behave dramatically differently in the same environment.<\/p>\n

This guide provides systematic chemical resistance data for PA6, PA66, and PA12 across all major chemical classes, with clear guidance on when nylon is appropriate and when alternative materials should be specified.<\/p>\n

\"Chemical
Chemical resistance testing laboratory \u2014 Nylon Plastic<\/figcaption><\/figure>\n

Understanding Nylon Chemical Resistance Mechanisms<\/h2>\n

Nylon resistance to chemicals operates through three distinct mechanisms. Understanding which mechanism applies to your environment determines whether the material will perform reliably.<\/p>\n

Physical resistance<\/strong>: The polymer matrix physically blocks chemical penetration. This is the dominant mechanism for non-polar solvents like gasoline and oils \u2014 nylon has excellent resistance because hydrocarbon molecules cannot penetrate the crystalline domains.<\/p>\n

Chemical resistance<\/strong>: The polymer chain does not react with the chemical. This is why nylon is attacked by strong acids and bases \u2014 they hydrolyze the amide bonds in the polyamide chain.<\/p>\n

Plasticization and swelling<\/strong>: Water and polar solvents penetrate the amorphous regions, swelling the polymer without breaking chemical bonds. This increases flexibility but reduces stiffness and dimensional accuracy.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Chemical Class<\/th>\nPA6<\/th>\nPA66<\/th>\nPA12<\/th>\nPrimary Mechanism<\/th>\nApplication Notes<\/th>\n<\/tr>\n<\/thead>\n
Motor oils (mineral)<\/td>\nExcellent<\/td>\nExcellent<\/td>\nExcellent<\/td>\nPhysical barrier<\/td>\nUnder-hood auto applications<\/td>\n<\/tr>\n
Motor oils (synthetic)<\/td>\nExcellent<\/td>\nExcellent<\/td>\nExcellent<\/td>\nPhysical barrier<\/td>\nATS, DCT fluids<\/td>\n<\/tr>\n
Gasoline (aromatic)<\/td>\nGood (60\u00b0C)<\/td>\nGood (100\u00b0C)<\/td>\nExcellent<\/td>\nPhysical barrier<\/td>\nFuel rails: PA66-GF30<\/td>\n<\/tr>\n
Ethanol blends (E85)<\/td>\nLimited<\/td>\nLimited (80\u00b0C)<\/td>\nExcellent<\/td>\nPhysical + swelling<\/td>\nFuel lines: PA12 preferred<\/td>\n<\/tr>\n
Diesel, Biodiesel<\/td>\nBon<\/td>\nBon<\/td>\nExcellent<\/td>\nPhysical barrier<\/td>\nFuel system components<\/td>\n<\/tr>\n
ATF \/ Transmission fluid<\/td>\nGood (120\u00b0C)<\/td>\nExcellent (150\u00b0C)<\/td>\nBon<\/td>\nPhysical barrier<\/td>\nTransmission oil pans<\/td>\n<\/tr>\n
Glycol coolant (50\/50)<\/td>\nGood (100\u00b0C)<\/td>\nGood (130\u00b0C)<\/td>\nExcellent<\/td>\nSwelling (limited)<\/td>\nCoolant reservoirs<\/td>\n<\/tr>\n
Brake fluids (DOT 3\/4\/5)<\/td>\nPauvre<\/td>\nPauvre<\/td>\nBon<\/td>\nChemical attack<\/td>\nUse PA12 for brake components<\/td>\n<\/tr>\n
Weak acids (<10%)<\/td>\nLimited (elev T)<\/td>\nLimited (elev T)<\/td>\nBon<\/td>\nChemical hydrolysis<\/td>\nPA12 or PP for acid contact<\/td>\n<\/tr>\n
Strong acids (>10%)<\/td>\nNot recommended<\/td>\nNot recommended<\/td>\nLimited<\/td>\nRapid hydrolysis<\/td>\nPVDF or PTFE for acid<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Water Absorption and Its Effect on Chemical Resistance<\/h2>\n

Moisture absorption fundamentally changes nylon’s chemical resistance profile. Dry nylon is more chemically resistant to polar solvents (the plasticized, wet state actually resists further polar penetration) but is more susceptible to oxidative degradation. This creates a critical design consideration: parts in wet service should be tested in the conditioned (wet) state, not dry-as-molded.<\/p>\n

\n\n\n\n\n\n\n\n\n
Conditioning State<\/th>\nPA6 Tensile Strength<\/th>\nPA6 Modulus<\/th>\nChemical Resistance to Water<\/th>\nChemical Resistance to Acids<\/th>\n<\/tr>\n<\/thead>\n
Dry as molded (0%)<\/td>\n85 MPa<\/td>\n3,200 MPa<\/td>\nN\/A<\/td>\nPoor (brittle failure)<\/td>\n<\/tr>\n
Conditioned 50% RH (2.5%)<\/td>\n65 MPa<\/td>\n2,000 MPa<\/td>\nModerate<\/td>\nModerate (ductile)<\/td>\n<\/tr>\n
Saturated (9.0%)<\/td>\n45-50 MPa<\/td>\n1,200 MPa<\/td>\nSwells significantly<\/td>\nModerate (ductile)<\/td>\n<\/tr>\n
After drying (0.1%)<\/td>\n80+ MPa<\/td>\n3,000 MPa<\/td>\nExcellent<\/td>\nPoor (brittle failure)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Industrial and Laboratory Chemical Environments<\/h2>\n

For chemical processing and industrial equipment, verify compatibility under actual operating conditions with immersion testing. The following table provides baseline guidance for common industrial chemicals.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Chemical<\/th>\nPA6<\/th>\nPA66<\/th>\nPA12<\/th>\nMax Service Temp (\u00b0C)<\/th>\nAlternative Material<\/th>\n<\/tr>\n<\/thead>\n
Sulfuric acid (10%)<\/td>\nLimited<\/td>\nNot recommended<\/td>\nLimited<\/td>\n40\u00b0C<\/td>\nPVDF, HDPE<\/td>\n<\/tr>\n
Hydrochloric acid (10%)<\/td>\nNot recommended<\/td>\nNot recommended<\/td>\nLimited<\/td>\n40\u00b0C<\/td>\nPVDF, PTFE<\/td>\n<\/tr>\n
Sodium hydroxide (50%)<\/td>\nLimited (>60\u00b0C)<\/td>\nNot recommended<\/td>\nBon<\/td>\n80\u00b0C<\/td>\nPP, HDPE<\/td>\n<\/tr>\n
Acetone<\/td>\nLimited<\/td>\nNot recommended<\/td>\nBon<\/td>\n60\u00b0C<\/td>\nPTFE<\/td>\n<\/tr>\n
Ethanol<\/td>\nBon<\/td>\nBon<\/td>\nExcellent<\/td>\n100\u00b0C<\/td>\nPA12 de pr\u00e9f\u00e9rence<\/td>\n<\/tr>\n
Phenol (5%)<\/td>\nNot recommended<\/td>\nNot recommended<\/td>\nNot recommended<\/td>\nN\/A<\/td>\nPTFE only<\/td>\n<\/tr>\n
Formic acid (10%)<\/td>\nNot recommended<\/td>\nNot recommended<\/td>\nLimited<\/td>\n40\u00b0C<\/td>\nPTFE, PVDF<\/td>\n<\/tr>\n
Calcium chloride<\/td>\nLimited<\/td>\nLimited<\/td>\nBon<\/td>\n80\u00b0C<\/td>\nPA12 for salt contact<\/td>\n<\/tr>\n
Steam (continuous)<\/td>\nNot recommended<\/td>\nNot recommended<\/td>\nLimited<\/td>\n120\u00b0C<\/td>\nPPS, PTFE<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Automotive Fluids: The Most Common Real-World Exposure<\/h2>\n

Automotive under-hood applications define the largest volume of nylon use globally. The following data reflects ASTM D543 immersion testing results at specified temperatures and exposure durations (typically 1,000 hours = approximately 6 weeks of continuous exposure).<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
Fluide<\/th>\nPA6<\/th>\nPA66<\/th>\nPA12<\/th>\nWeight Change<\/th>\nTensile Retention<\/th>\nApplication Confidence<\/th>\n<\/tr>\n<\/thead>\n
Engine oil SAE 5W-30 (150\u00b0C)<\/td>\nExcellent<\/td>\nExcellent<\/td>\nExcellent<\/td>\n<1%<\/td>\n>95%<\/td>\nFull production use<\/td>\n<\/tr>\n
Transmission fluid ATF (130\u00b0C)<\/td>\nBon<\/td>\nExcellent<\/td>\nBon<\/td>\n<2%<\/td>\n>90%<\/td>\nFull production use<\/td>\n<\/tr>\n
Power steering fluid (120\u00b0C)<\/td>\nBon<\/td>\nBon<\/td>\nExcellent<\/td>\n<2%<\/td>\n>90%<\/td>\nFull production use<\/td>\n<\/tr>\n
Coolant 50\/50 EG (130\u00b0C)<\/td>\nBon<\/td>\nBon<\/td>\nExcellent<\/td>\n<3%<\/td>\n>85%<\/td>\nFull production use<\/td>\n<\/tr>\n
Brake fluid DOT 4 (120\u00b0C)<\/td>\nPauvre<\/td>\nPauvre<\/td>\nBon<\/td>\n>10%<\/td>\n<60%<\/td>\nPA12 only<\/td>\n<\/tr>\n
Windshield washer (60\u00b0C)<\/td>\nExcellent<\/td>\nExcellent<\/td>\nExcellent<\/td>\n<0.5%<\/td>\n>99%<\/td>\nFull production use<\/td>\n<\/tr>\n
Battery acid (25\u00b0C)<\/td>\nNot recommended<\/td>\nNot recommended<\/td>\nNot recommended<\/td>\nN\/A<\/td>\nN\/A<\/td>\nPP or PE only<\/td>\n<\/tr>\n
AdBlue \/ DEF (urea)<\/td>\nBon<\/td>\nBon<\/td>\nExcellent<\/td>\n<1%<\/td>\n>95%<\/td>\nSCR system components<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\n

FAQ<\/h2>\n
\"R\u00e9sistance
R\u00e9sistance chimique du nylon : Acides, bases, solvants et autres<\/figcaption><\/figure>\n
\nComment savoir si la r\u00e9sistance chimique du nylon : Acides, Bases, Solvants, et autres, correspond \u00e0 un besoin ?<\/summary>\n
\n

R\u00e9sistance chimique du nylon : Acides, bases, solvants et autres convient \u00e0 une pi\u00e8ce lorsque sa capacit\u00e9 de charge, sa plage de temp\u00e9ratures, son exposition \u00e0 l'humidit\u00e9, son comportement \u00e0 l'usure et sa m\u00e9thode de traitement correspondent aux conditions de service r\u00e9elles.<\/p>\n<\/div>\n<\/details>\n

\nQuelles sont les propri\u00e9t\u00e9s \u00e0 v\u00e9rifier pour la r\u00e9sistance chimique du nylon : Acides, bases, solvants et autres ?<\/summary>\n
\n

V\u00e9rifier la r\u00e9sistance, la rigidit\u00e9, la r\u00e9sistance aux chocs, la r\u00e9sistance \u00e0 la chaleur, l'absorption d'humidit\u00e9, la stabilit\u00e9 dimensionnelle, le frottement, l'usure et la compatibilit\u00e9 chimique.<\/p>\n<\/div>\n<\/details>\n

\nQuel est le plus grand risque de s\u00e9lection pour Nylon Chemical Resistance : Acides, bases, solvants et autres ?<\/summary>\n
\n

Le plus grand risque est de choisir \u00e0 partir d'une fiche technique sans tenir compte de l'environnement r\u00e9el, de la m\u00e9thode de traitement, de la g\u00e9om\u00e9trie de la pi\u00e8ce et de l'utilisation \u00e0 long terme.<\/p>\n<\/div>\n<\/details>\n

\nQuand faut-il tester la r\u00e9sistance chimique du nylon : Acides, bases, solvants et autres doit-il \u00eatre test\u00e9 avant la production ?<\/summary>\n
\n

Les essais sont recommand\u00e9s lorsque la pi\u00e8ce est soumise \u00e0 une charge, \u00e0 la chaleur, \u00e0 des produits chimiques, \u00e0 l'humidit\u00e9, \u00e0 des tol\u00e9rances serr\u00e9es, \u00e0 des exigences r\u00e9glementaires ou \u00e0 un nouvel environnement de travail.<\/p>\n<\/div>\n<\/details>\n<\/div>\n\t\t\t

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