Tips for reducing brittle parts of PP

Degradation of PP Material
l Reduce Barrel Temperatures
l Reduce Material Residence Time in Barrel
l Check Barrel-To-Shot Ratio
High Level of Molded-In Stresses
l Increase Barrel Temperatures
l Adjust Injection Speed (Moderate to Slower Speed)
Material Contamination
l Check Color Concentrates Used, as well as Base Resin
l Check Material Handling System, such as Material Feed Lines and Hopper for
Contaminant Materials
Poor Part Design
l Remove Sharp Corners and Use Radiused Corners
l Move Weld Lines Away from Areas Where Strength is Critical