Material Drying
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PPSU insufficient drying surface streaks
Problem Phenomenon
PPSU products show streaks or silver streaks on the surface, especially obvious on transparent baby bottles and medical parts; poor appearance but mechanical properties may be normal.
Cause Analysis
Although PPSU (Radel polyphenylsulfone) is hydrolysis stable and does not reduce molecular weight, incomplete drying causes surface streaks or severe blistering; moisture does not degrade the polymer but causes appearance defects; defective parts can be crushed, dried and reused.
Solution
①Dry at 177℃×2.5 hours, 150℃×4 hours, or 135℃×4.5 hours; ②moisture content ≤500ppm for '2079851475616104452, ≤100ppm for extrusion; ③seal after drying to prevent moisture regain; ④defective parts can be reused after drying without loss of performance.
Key Takeaway
PPSU drying is the prerequisite for appearance quality; 500ppm/100ppm are different standards for '2079851475616104452/extrusion; reusability is a material economic advantage.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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