Extrusion & Post
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PMMA Solvent Attack Cracking
Problem Phenomenon
Spider-web-like fine cracks appear and propagate after products contact alcohol or cleaning agents.
Cause Analysis
PMMA has limited solvent resistance; when internal stress exists, solvents invade along stress lines and induce environmental stress cracking; improper coating and cleaning agent selection accelerates attack.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solution
①Anneal to reduce internal stress; ②select compatible cleaning agents and coatings; ③avoid product contact with strong solvents; ④select stress-crack-resistant grades when necessary.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Solvent cracking is the combined action of stress and medium; media compatibility evaluation of the use environment should be included in product design verification.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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