{"id":5383,"date":"2026-05-07T03:46:38","date_gmt":"2026-05-07T03:46:38","guid":{"rendered":"https:\/\/nylonplastic.com\/nylon-water-absorption\/"},"modified":"2026-06-17T09:09:35","modified_gmt":"2026-06-17T09:09:35","slug":"nylon-water-absorption","status":"publish","type":"post","link":"https:\/\/nylonplastic.com\/fr\/nylon-water-absorption\/","title":{"rendered":"Comprendre l'absorption de l'eau par le nylon : Impact sur la stabilit\u00e9 dimensionnelle et les performances"},"content":{"rendered":"
\"Nylon
Water absorption is nylon’s most critical design consideration<\/figcaption><\/figure>\n

Nylon’s tendency to absorb moisture is perhaps the most important characteristic to understand when designing with this material. Proper design can turn this characteristic from a challenge into a manageable variable.<\/p>\n

Why Does Nylon Absorb Water?<\/h2>\n

Nylon’s molecular structure contains polar amide groups (-CONH-) that form hydrogen bonds with water molecules, causing the material to absorb moisture from humid air or liquid water.<\/p>\n

Moisture Absorption by Nylon Grade<\/h2>\n\n\n\n\n\n\n\n\n\n
Nylon Grade<\/th>\nMoisture at 50% RH<\/th>\nSaturation in Water<\/th>\nDimensional Change<\/th>\n<\/tr>\n<\/thead>\n
PA6<\/td>\n2.5-3.0%<\/td>\n9.5%<\/td>\n0.5-1.0%<\/td>\n<\/tr>\n
PA66<\/td>\n2.0-2.5%<\/td>\n8.0%<\/td>\n0.4-0.8%<\/td>\n<\/tr>\n
PA11<\/td>\n0.8%<\/td>\n1.9%<\/td>\n0.1-0.3%<\/td>\n<\/tr>\n
PA12<\/td>\n0.7%<\/td>\n1.5%<\/td>\n0.1-0.3%<\/td>\n<\/tr>\n
PA6 GF30<\/td>\n1.7-2.1%<\/td>\n6.5%<\/td>\n0.2-0.4%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\"Moisture
PA11 and PA12 absorb dramatically less moisture than PA6 and PA66<\/figcaption><\/figure>\n

How Moisture Affects Mechanical Properties<\/h2>\n

Water acts as a plasticizer within the nylon matrix. A PA6 part at 50% RH can lose 20-40% of dry tensile strength and 30-50% of dry flexural modulus.<\/p>\n

Impact Resistance Increases<\/h3>\n
\"Impact
Moisture-conditioned nylon can have 2-3x the impact resistance of dry nylon<\/figcaption><\/figure>\n

Moisture conditioning improves impact resistance by 2-3x. This is why nylon parts are frequently conditioned before use in impact-critical applications.<\/p>\n

Design Strategies for Dimensional Control<\/h2>\n
    \n
  • Use glass-filled grades:<\/strong> GF30 absorbs ~30% less moisture<\/li>\n
  • Select low-moisture grades:<\/strong> PA11\/PA12 for critical applications<\/li>\n
  • Design clearances:<\/strong> Account for swelling in tolerance calculations<\/li>\n
  • Pre-condition parts:<\/strong> Condition before final machining<\/li>\n
  • Use symmetrical designs:<\/strong> Symmetrical parts swell more uniformly<\/li>\n<\/ul>\n
    \"Design
    Smart design can accommodate nylon’s dimensional changes<\/figcaption><\/figure>\n

    Processing Implications<\/h2>\n

    Before processing, nylon must be dried to <0.2% moisture. Insufficient drying results in splay marks, reduced mechanical properties, and inconsistent dimensions.<\/p>\n

    Drying Recommendations<\/h3>\n\n\n\n\n\n\n\n
    Grade<\/th>\nDrying Temp<\/th>\nTime<\/th>\nTarget Moisture<\/th>\n<\/tr>\n<\/thead>\n
    PA6<\/td>\n80\u00b0C<\/td>\n4-8 hrs<\/td>\n< 0.10%<\/td>\n<\/tr>\n
    PA66<\/td>\n80\u00b0C<\/td>\n4-8 hrs<\/td>\n< 0.10%<\/td>\n<\/tr>\n
    PA12<\/td>\n80\u00b0C<\/td>\n3-4 hrs<\/td>\n< 0.05%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Our Capabilities<\/h2>\n

    With over 300 CNC machines<\/strong>, we produce more than 10,000 pieces daily<\/strong> with tolerances as tight as \u00b10.005mm<\/strong>. We accept MOQ from 1 piece<\/strong>, with delivery times ranging from 24 hours to 15 days<\/strong>. We understand nylon’s moisture behavior and design accordingly. Get a quote within 24 hours.<\/strong><\/p>\n

    \n

    FAQ<\/h2>\n
    \nHow do you know whether Understanding Nylon Water Absorption: Impact on Dimensional Stability and Performance fits a part?<\/summary>\n
    \n

    Understanding Nylon Water Absorption: Impact on Dimensional Stability and Performance fits a part when its load capacity, temperature range, moisture exposure, wear behavior, and processing method match the real service conditions.<\/p>\n<\/div>\n<\/details>\n

    \nWhat properties should be checked for Understanding Nylon Water Absorption: Impact on Dimensional Stability and Performance?<\/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

    \nWhat is the biggest selection risk for Understanding Nylon Water Absorption: Impact on Dimensional Stability and Performance?<\/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

    \nWhen should Understanding Nylon Water Absorption: Impact on Dimensional Stability and Performance be tested before 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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