Tensile Strength
- Use hotter mold temperatures
- Use high injection speed
- Avoid high melt temperature
- Injection pressure has little effect
Tensile Elongation
- Use hotter mold temperatures
- Avoid high melt temperature
Flexural Modulus
- Use higher melt temperatures
- Use high injection speed
- Injection pressure has only moderate effect
Flexural Strength
- Use hotter mold temperatures
- Avoid high melt temperature
- Injection pressure has only moderate effect
Notched IZOD Impact
- Use hotter mold temperatures (cold mold can cause 50% loss in impact strength)
- Avoid high melt temperature
Shrinkage
- Use cold mold to reduces shrinkage
- Use high injection pressure
- Avoid high screw rpm
- Avoid high melt temperatures
Warpage
- Use longer hold time reduces warpage
- Reduce stress with high mold and melt temperatures
Regrind Usage
Generally, 20% regrind is acceptable. There are times when no regrind is permissible. The application should always be thoroughly tested. Regrind should always be kept clean, dry and uniformly mixed with the virgin material.
