Material Drying
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Silver streaks and bubbles in PMMA '2079851475616104452
Fenómeno del problema
Silver streaks and bubbles appear in PMMA transparent products.
Análisis de la causa
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.
Solución
Dry at 70-85°C for 4-6h to moisture <0.05%; use a dehumidifying dryer with dew point ≤-25°C.
Conclusión clave
PMMA drying is the first priority for transparent quality.
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