Material Analysis
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PMMA Impact Resistance Shortcoming
Problem Phenomenon
Transparent protective parts shatter upon impact, and fragments fly and injure people
Cause Analysis
PMMA impact resistance is only 7-18 times that of ordinary glass but far below PC, and its fracture mode is shattering; high-impact scenarios must use PC or impact-modified PMMA
Solution
①Switch to PC for high-impact scenarios; ②choose impact-modified PMMA for medium requirements (strength several times higher than standard sheets); ③conduct impact verification on protective parts; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PMMA's brittle nature cannot be avoided; material selection review for impact scenarios should directly point to PC or modified grades; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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