Material Drying
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The mechanical properties of PA materials differ greatly before and after moisture absorption, which needs to be considered in design
Problem Phenomenon
The mechanical properties of PA materials differ greatly before and after moisture absorption, which needs to be considered in design
Cause Analysis
（1）The moisture absorption rate of polyamide (general-purpose nylon) is 1.5-2.5%; after moisture absorption, the impact strength increases but the rigidity decreases
（2）The dry state has high rigidity and low impact, and the wet state has low rigidity and high impact
（3）The tensile strength and flexural modulus fluctuate greatly under different moisture contents
（4）In engineering design, it is necessary to clarify whether the dry state or wet state is used as the benchmark
（5）The performance changes with the humidity change of the product use environment
Solution
（1）Clarify the dry state/wet state performance benchmark during design
（2）Use dry state performance values for dry state design and wet state performance values for wet state design
（3）Moisture conditioning treatment stabilizes the moisture content at the target value
（4）Performance data are marked with moisture content conditions
（5）Select low-moisture-absorption PA varieties to reduce performance fluctuation
Key Takeaway
PA mechanical properties need a clear dry state/wet state benchmark
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