{"id":3911,"date":"2026-04-22T06:17:19","date_gmt":"2026-04-22T06:17:19","guid":{"rendered":"https:\/\/nylonplastic.com\/nylon-6-vs-nylon-66-engineering-plastic-selection-guide-2\/"},"modified":"2026-06-11T03:57:09","modified_gmt":"2026-06-11T03:57:09","slug":"nylon-6-vs-nylon-66-comparison-overview","status":"publish","type":"post","link":"https:\/\/nylonplastic.com\/fr\/nylon-6-vs-nylon-66-comparison-overview\/","title":{"rendered":"Nylon 6 vs Nylon 66 - Guide de s\u00e9lection des plastiques techniques"},"content":{"rendered":"
\"nylon<\/figure>\n
\"Nylon
Nylon 6 vs Nylon 66 - Guide de s\u00e9lection des plastiques techniques<\/figcaption><\/figure>\n
\"Nylon
Nylon 6 vs Nylon 66 - Guide de s\u00e9lection des plastiques techniques<\/figcaption><\/figure>\n
Nylon 6 vs Nylon 66 - Guide de s\u00e9lection des plastiques techniques<\/figcaption><\/figure>\n
\"Nylon
Nylon 6 vs Nylon 66 - Guide de s\u00e9lection des plastiques techniques<\/figcaption><\/figure>\n

Chemical Structure Differences<\/h2>\n

The fundamental difference between PA6 (Nylon 6)<\/strong> et PA66 (Nylon 66)<\/strong> lies in their molecular structure:<\/p>\n

    \n
  • Nylon 6:<\/strong> Made from caprolactam, has 6 carbon atoms in each repeating unit. Less crystalline structure.<\/li>\n
  • Nylon 66:<\/strong> Made from hexamethylenediamine and adipic acid, has two 6-carbon chains. More crystalline structure.<\/li>\n<\/ul>\n

    Mechanical Properties Comparison<\/h2>\n\n\n\n\n\n\n\n\n
    Propri\u00e9t\u00e9<\/th>\nPA6<\/th>\nPA66<\/th>\n<\/tr>\n
    R\u00e9sistance \u00e0 la traction<\/td>\n70-85 MPa<\/td>\n80-100 MPa<\/td>\n<\/tr>\n
    Module de flexion<\/td>\n2.5-3.0 GPa<\/td>\n2.8-3.5 GPa<\/td>\n<\/tr>\n
    Allongement \u00e0 la rupture<\/td>\n30-100%<\/td>\n15-60%<\/td>\n<\/tr>\n
    Notched Izod Impact<\/td>\n50-100 J\/m<\/td>\n40-80 J\/m<\/td>\n<\/tr>\n
    Point de fusion<\/td>\n220\u00b0C<\/td>\n260\u00b0C<\/td>\n<\/tr>\n
    HDT at 1.8 MPa<\/td>\n70\u00b0C<\/td>\n90\u00b0C<\/td>\n<\/tr>\n<\/table>\n

    Absorption de l'humidit\u00e9<\/h2>\n

    Moisture absorption is critical for nylon applications:<\/p>\n\n\n\n\n
    Condition<\/th>\nPA6<\/th>\nPA66<\/th>\n<\/tr>\n
    At 50% RH<\/td>\n2.5-3.0%<\/td>\n2.0-2.5%<\/td>\n<\/tr>\n
    Saturation<\/td>\n8-10%<\/td>\n6-8%<\/td>\n<\/tr>\n<\/table>\n

    Processing Characteristics<\/h2>\n

    Nylon 6 Processing<\/h3>\n
      \n
    • Melting Point:<\/strong> 220\u00b0C<\/li>\n
    • Processing Range:<\/strong> 240-280\u00b0C<\/li>\n
    • Temp\u00e9rature du moule :<\/strong> 40-80\u00b0C<\/li>\n<\/ul>\n

      Nylon 66 Processing<\/h3>\n
        \n
      • Melting Point:<\/strong> 260\u00b0C<\/li>\n
      • Processing Range:<\/strong> 280-320\u00b0C<\/li>\n
      • Temp\u00e9rature du moule :<\/strong> 60-90\u00b0C<\/li>\n<\/ul>\n

        Applications by Material<\/h2>\n

        Nylon 6 Applications<\/h3>\n
          \n
        • Gears and sprockets<\/li>\n
        • Industrial monofilament<\/li>\n
        • Film and packaging<\/li>\n
        • Consumer products<\/li>\n<\/ul>\n

          Nylon 66 Applications<\/h3>\n
            \n
          • Automotive under-hood components<\/li>\n
          • Electrical connectors<\/li>\n
          • High-temperature bearings<\/li>\n
          • Precision mechanical components<\/li>\n<\/ul>\n

            Reinforced Grades<\/h2>\n

            Both materials are commonly reinforced with glass fiber:<\/p>\n\n\n\n\n\n
            Grade<\/th>\nPA6 + GF30<\/th>\nPA66 + GF30<\/th>\n<\/tr>\n
            R\u00e9sistance \u00e0 la traction<\/td>\n140-160 MPa<\/td>\n170-200 MPa<\/td>\n<\/tr>\n
            HDT (1.8 MPa)<\/td>\n205\u00b0C+<\/td>\n250\u00b0C+<\/td>\n<\/tr>\n
            Absorption de l'humidit\u00e9<\/td>\n1.0-1.5%<\/td>\n0.8-1.2%<\/td>\n<\/tr>\n<\/table>\n

            Selection Summary<\/h2>\n

            Choose Nylon 6 when:<\/strong><\/p>\n

              \n
            • Impact resistance is critical<\/li>\n
            • Cost sensitivity is high<\/li>\n
            • Operating temperatures are moderate<\/li>\n<\/ul>\n

              Choose Nylon 66 when:<\/strong><\/p>\n

                \n
              • Higher mechanical strength is required<\/li>\n
              • Elevated temperatures are expected<\/li>\n
              • Dimensional stability is critical<\/li>\n<\/ul>\n
                \n

                FAQ<\/h2>\n
                \nWhen is Nylon 6 vs Nylon 66 \u2014 Engineering Plastic Selection Guide a good option?<\/summary>\n
                \n

                Nylon 6 vs Nylon 66 \u2014 Engineering Plastic Selection Guide is a good option when fast iteration, complex geometry, low tooling cost, or low-volume production is more important than molded-part unit cost.<\/p>\n<\/div>\n<\/details>\n

                \nWhat should be checked before choosing Nylon 6 vs Nylon 66 \u2014 Engineering Plastic Selection Guide?<\/summary>\n
                \n

                V\u00e9rifier la taille de la pi\u00e8ce, les propri\u00e9t\u00e9s du mat\u00e9riau, l'\u00e9tat de surface, la tol\u00e9rance dimensionnelle, l'exposition \u00e0 la chaleur, la direction de la charge et la n\u00e9cessit\u00e9 d'un post-traitement.<\/p>\n<\/div>\n<\/details>\n

                \nHow does Nylon 6 vs Nylon 66 \u2014 Engineering Plastic Selection Guide compare with CNC machining?<\/summary>\n
                \n

                L'impression 3D permet de cr\u00e9er rapidement des formes complexes, tandis que l'usinage CNC est souvent plus performant pour les surfaces pr\u00e9cises, les tol\u00e9rances plus \u00e9troites et les mat\u00e9riaux de qualit\u00e9.<\/p>\n<\/div>\n<\/details>\n

                \nWhat affects the cost of Nylon 6 vs Nylon 66 \u2014 Engineering Plastic Selection Guide?<\/summary>\n
                \n

                Le co\u00fbt d\u00e9pend du mat\u00e9riau, du volume de construction, du temps d'impression, de la hauteur des couches, de l'enl\u00e8vement du support, de la finition, de l'inspection et du nombre de pi\u00e8ces dans la construction.<\/p>\n<\/div>\n<\/details>\n<\/div>\n\t\t\t

                \n\t\t\t