Resin Library

PP

CommodityCrystallineHygroscopicity NoneVerified

Drying Conditions

Non-hygroscopic — pre-drying is generally not required.

Melt Temperature

200~250°C

Thermal degradation risk above 290°C

Minimize residence time and avoid exceeding this temperature.

Mold Temperature

20~60°C

Shrinkage

1~2.5%

Common Defects & First Checks

Warpage

PP: warpage is dominant (uneven crystallization).

View Guide
Sink Mark

PP: warpage is dominant (uneven crystallization).

View Guide
Flow Mark

PP: warpage is dominant (uneven crystallization).

Field Notes

PP: warpage is dominant (uneven crystallization). High, anisotropic shrinkage with fiber. Mold temp uniformity is key to warpage control. Sink at thick sections.

Got a defect with PP? Upload a photo and settings — we'll estimate the cause

Related Resins

Get it on Google Play

This data is a field-reference summary. Always verify against the resin manufacturer’s official TDS.