Material Drying
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PA66 moisture conditioning toughening treatment
Problem Phenomenon
Freshly demolded PA66 parts are brittle and hard, snap-fits break during assembly, and they soften again after a period of use
Cause Analysis
Dry-state PA66 has strong hydrogen bonds between molecular chains and behaves brittle and hard; after water absorption, water molecules weaken hydrogen bonds and act as toughening, conditioned-state impact strength can reach 2-3 times that of dry state, but tensile strength decreases by 40-50%
Solution
①Moisture conditioning after molding: 80-100℃ water temperature moisture absorption chamber treatment or natural conditioning; ②Assemble after conditioning to equilibrium moisture content; ③Uniformly indicate dry state or conditioned state in performance tests
Key Takeaway
Moisture conditioning is the standard post-treatment for PA66 from brittle to tough; moisture absorption chambers have better consistency than traditional water boiling, and dry-state and conditioned-state data must not be mixed; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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