I(https://www.zijunplastic.com/pa‑nylon‑resin/) (PA6 and PA66 polyamide) delivers excellent mechanical strength, oil‑resistance and wear‑resistance, widely used for automotive structural parts, electrical connectors and mechanical gears. Nevertheless, nylon’s strong moisture‑absorption property creates lots of processing and post‑molding troubles for many molders. Before injection, sufficient drying is non‑negotiable. Wet nylon pellets will generate massive bubbles, silver streaks and surface blemishes. Suggest drying condition: PA6: 80‑85℃ for 4‑6 hours; PA66: 80‑90℃ for 4‑6 hours. Desiccant‑type dryer is strongly recommended; ordinary hot‑air dryer cannot reach satisfactory low‑moisture effect in humid tropical regions. A second well‑known phenomenon: finished‑nylon parts keep absorbing ambient moisture after molding. Along with water intake, toughness improves while rigidity and dimensional size shift. Product designers must reserve dimension tolerance considering post‑molding water‑absorbing change. Glass‑fiber reinforced PA‑GF30 reduces shrinkage yet still keeps moisture‑absorbing feature. Many buyers mix‑up PA6 and PA66. PA6 shows better toughness and easier processing; PA66 owns higher heat‑resistance and tensile strength. For high‑temperature‑working automotive under‑hood components, PA66‑GF is preferred solution. If your product works under continuous friction environment, compare performance against [POM resin](https://www.zijunplastic.com/pom‑resin/) as alternative wear‑resistant engineering plastic. Jiangsu Zijun International Trade supplies unreinforced and glass‑fiber‑filled PA6 / PA66 virgin nylon pellets. We remind customers seal leftover raw‑material bags tightly after opening to avoid re‑absorbing atmospheric moisture during warehouse storage. For projects needing improved low‑temperature impact performance, adding suitable‑grade [POE resin]https://www.zijunplastic.com
PA6 & PA66 Nylon Processing & Storage Guide: Solve Moisture‑Related Defects for Polyamide Parts
2026 08/19