Processing Machinery
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PMMA Chemical Resistance Boundary
Fenómeno del problema
PMMA parts swell and crack after contact with gasoline or ketone solvents, but remain unaffected by contact with grease and dilute acids
Análisis de la causa
PMMA resists aliphatic hydrocarbons, grease, and dilute acids below 60℃; chlorinated hydrocarbons, ketones, alcohols, ethers, esters, aromatic hydrocarbons, and gasoline cause it to swell or stress-crack; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
①Verify chemical contact according to the media list; ②prohibit PMMA in ketone, alcohol, ester, and aromatic hydrocarbon environments; ③choose PMMA-compatible cleaners; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PMMA chemical resistance is selective; the solvent blacklist must be synchronized in design and maintenance; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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