Material Drying
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Silver streaks and bubbles in PMMA '2079851475616104452
Problem Phenomenon
Silver streaks and bubbles appear in PMMA transparent products.
Cause Analysis
PMMA has strong hygroscopicity (water absorption rate 0.3%); insufficient drying leaves moisture >0.05%, and moisture vaporizes at processing temperature producing silver streaks and bubbles.
Solution
Dry at 70-85°C for 4-6h to moisture <0.05%; use a dehumidifying dryer with dew point ≤-25°C.
Key Takeaway
PMMA drying is the first priority for transparent quality.
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