Molds & Tooling
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PEI Melt Temperature Too High Degradation
Problem Phenomenon
PEI products show silver streaks, discoloration, and embrittlement; after the melt temperature exceeds 382℃, the color change is obvious, and degraded material contaminates subsequent production.
Cause Analysis
The common melting temperature of PEI is 338~399℃, but exceeding 382℃ may cause color change; it is highly temperature-sensitive, and overtemperature degrades molecular chains; some customers raise the melt temperature to fill the cavity, which instead causes material degradation and silver streaks on the surface.
Solution
①Control the melt temperature in the common range of 340~380℃, strictly prohibiting exceeding 382℃; ②for insufficient filling, prioritize raising mold temperature rather than melt temperature; ③calibrate temperature by actual measurement; ④thoroughly clean the machine after degradation.
Key Takeaway
PEI's 382℃ discoloration line is a clear supplier warning; raising mold temperature instead of melt temperature is the correct path to solve filling; temperature-sensitive materials are strictly prohibited from trading temperature for volume.
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