Material Drying
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PA6 Moisture Absorption Conditioning Treatment
Problem Phenomenon
Freshly demolded PA6 parts are brittle, hard and easy to break, snap-fits break during assembly, and become soft again after a period of use
Cause Analysis
In the dry state, hydrogen bonds between PA6 molecular chains are strong and the material behaves as brittle and hard; after water absorption, water molecules weaken the hydrogen bonds and play a toughening role, and after equilibrium water absorption of 2.5-3.5% the impact strength can increase 2-3 times
Solution
①Conditioning treatment after molding: rapid conditioning with boiling water or steam, or natural conditioning at 50-60%RH for several days; ②Assemble only after conditioning to the equilibrium moisture content; ③For precision parts, conditioning also stabilizes dimensions
Key Takeaway
Conditioning is a necessary post-treatment for PA6 to go from brittle to tough; it turns moisture absorption from an uncontrolled environmental variable into a controlled process step, achieving both performance and dimensional wins; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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