← Defect Guide
Brittleness
Parts crack easily under impact or show reduced strength, often from molecular-weight loss or material issues.
◆ Common Causes
- •Molecular-weight loss from over-drying or overheating (thermal degradation)
- •Excessive regrind ratio
- •Hydrolysis from moisture (PA, PC, PET)
- •Contamination with incompatible resin
- •Low melt/mold temperature (poor weld or interlayer fusion)
◆ Solutions
- ✓Optimize drying (avoid over-drying)
- ✓Reduce regrind ratio; increase virgin resin
- ✓Dry hydrolysis-prone resins to spec
- ✓Purge thoroughly and inspect material
- ✓Raise melt/mold temperature; review weld-line placement
◆ Resin-Specific Notes
PC
Hydrolytic embrittlement. Dry at 120°C; re-drying mandatory.
PA
Sensitive to both moisture and over-drying. Dry to spec.
PET
Strong hydrolysis. Low-moisture drying essential.
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This content is a field-reference summary. Final judgment requires on-site engineer verification.