Polypropylene (PP) is a commonly used plastic material, but its high shrinkage can pose challenges in certain applications. Here are several approaches to tackle the issue of high shrinkage in PP material:

Material Formulation Adjustment: Altering the formulation of PP material can impact its shrinkage rate. Adding fillers, reinforcements, or modifiers can adjust the material's thermal shrinkage behavior. Collaborate with plastics processing experts to modify the formulation for reduced shrinkage.

Lower Processing Temperature: During processes such as injection molding or extrusion, reducing the processing temperature can minimize the material's thermal shrinkage. Lowering the processing temperature can help mitigate volume shrinkage during cooling.

Increase Mold Temperature: In injection molding, raising the mold temperature can decrease cooling rates, thus reducing material shrinkage. However, excessive mold temperatures might lead to other processing issues and need careful consideration.

Modify Mold Design: Optimizing mold design can partially alleviate material shrinkage. For instance, design changes such as increasing cavity dimensions or minimizing wall thickness variations can influence shrinkage effects.

Post-Processing Techniques: Some post-processing techniques, such as annealing or thermal stabilization, can help reduce PP material shrinkage. These processes involve heat treatment after material processing to enhance shrinkage performance.

       Select Appropriate Alternative Materials: If the high shrinkage of PP material is unacceptable for a specific application, consider choosing alternative engineering plastics with lower shrinkage rates, such as polycarbonate (PC) or polyether ether ketone (PEEK).

For your specific situation, the best approach may depend on the material's exact performance requirements, processing procedures, and ultimate application. Collaborate with plastics processing experts to conduct necessary tests and optimizations to find the optimal solution.