Processing Machinery
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PMMA Medical Devices
Problem Phenomenon
Medical transparent parts crack after sterilization, and craze where wiped with alcohol disinfection
Cause Analysis
Alcohol-based disinfectants are a classic cause of PMMA stress cracking; sterilization methods do not match the material; high-stress molded parts fail quickly in chemical environments; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Verify alcohol compatibility for parts in contact with disinfection; ②choose chemically resistant modified grades or alternative materials; ③anneal after molding to reduce stress; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Alcohol contact in medical scenarios is a hard constraint for PMMA; three layers of protection: verification, modification, and annealing; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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