Production & Quality
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PA6 and PA12 Selection
Problem Phenomenon
Precision PA6 parts used in humid environments show dimensional drift exceeding the standard, and assembly jams
Cause Analysis
PA6's equilibrium water absorption of 2.8% brings 0.5-1% dimensional expansion, causing precision fits to fail in humid environments; PA12 absorbs only 0.25% water, with dimensions almost unchanged with humidity, but the price is 3-5 times higher
Solution
①Switch precision parts in humid environments to PA12; ②PA6 parts are used after pre-stabilizing dimensions through conditioning; ③evaluate the material price difference by full life cycle quality cost; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Humidity dimensional stability is the watershed between PA6 and PA12; conditioning pretreatment can alleviate it, but the premium of PA12 is worth the money in high-precision scenarios; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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