{"id":5573,"date":"2026-05-08T05:46:47","date_gmt":"2026-05-08T05:46:47","guid":{"rendered":"https:\/\/nylonplastic.com\/nylon-vs-pbt-engineering-thermoplastic-comparison\/"},"modified":"2026-06-17T09:09:55","modified_gmt":"2026-06-17T09:09:55","slug":"nylon-vs-pbt-engineering-thermoplastic-comparison","status":"publish","type":"post","link":"https:\/\/nylonplastic.com\/fr\/nylon-vs-pbt-engineering-thermoplastic-comparison\/","title":{"rendered":"Nylon vs PBT : Comparaison compl\u00e8te des thermoplastiques d'ing\u00e9nierie"},"content":{"rendered":"
\n \"nylon-vs-pbt-engineering-thermoplastic-comparison\"
nylon vs pbt engineering thermoplastic comparison<\/figcaption><\/figure>\n

Two Engineering Plastics, Two Different Worlds<\/h2>\n

Nylon (polyamide, PA) and PBT (polybutylene terephthalate) are both semi-crystalline engineering thermoplastics widely used in automotive, electrical, and industrial applications. They often compete for the same applications\u2014connectors, housings, structural brackets\u2014but their performance profiles are fundamentally different. Choosing between them requires understanding not just the datasheet numbers, but how each material behaves in the real world under heat, moisture, chemicals, and mechanical load over thousands of hours and millions of cycles.<\/p>\n

The critical distinction that drives most material selection decisions: nylon absorbs moisture and PBT doesn’t.<\/strong> From this single chemical difference flows a cascade of property variations that define where each material excels\u2014and fails.<\/p>\n

Property Head-to-Head<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Propri\u00e9t\u00e9<\/th>\nPA6 GF30<\/th>\nPBT GF30<\/th>\nWinner<\/th>\n<\/tr>\n<\/thead>\n
Tensile Strength (dry, MPa)<\/td>\n160\u2013180<\/td>\n130\u2013150<\/td>\nPA<\/td>\n<\/tr>\n
Tensile Strength (conditioned, MPa)<\/td>\n100\u2013120<\/td>\n125\u2013145<\/td>\nPBT<\/td>\n<\/tr>\n
Module de flexion (GPa)<\/td>\n9\u201310<\/td>\n8\u20139<\/td>\nPA (dry)<\/td>\n<\/tr>\n
Izod entaill\u00e9 (kJ\/m\u00b2)<\/td>\n10\u201315<\/td>\n8\u201312<\/td>\nPA<\/td>\n<\/tr>\n
HDT @ 1.82 MPa (\u00b0C)<\/td>\n195\u2013205<\/td>\n200\u2013215<\/td>\nPBT<\/td>\n<\/tr>\n
Moisture absorption (24h, %)<\/td>\n1.2-1.8<\/td>\n0.05\u20130.10<\/td>\nPBT (dramatically)<\/td>\n<\/tr>\n
Mold shrinkage (%)<\/td>\n0.3\u20130.7<\/td>\n0.2\u20130.5<\/td>\nPBT<\/td>\n<\/tr>\n
Dielectric strength (kV\/mm)<\/td>\n20\u201325<\/td>\n25\u201330<\/td>\nPBT<\/td>\n<\/tr>\n
Chemical resistance (acids)<\/td>\nPauvre<\/td>\nGood\u2013Excellent<\/td>\nPBT<\/td>\n<\/tr>\n
Chemical resistance (bases)<\/td>\nExcellent<\/td>\nPauvre<\/td>\nPA<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\"Illustration<\/figure>\n

The Moisture Factor: Nylon’s Defining Characteristic<\/h2>\n

Nylon’s amide groups form hydrogen bonds with water molecules, absorbing 1\u20133% moisture at equilibrium (50% RH). This absorbed water acts as a plasticizer: strength and stiffness drop 20\u201340% while impact resistance increases 3\u20135\u00d7 compared to the dry-as-molded state. This means:<\/p>\n