How to Improve Mechanical Properties with High Filler Content in PVC
How to Improve Mechanical Properties with High Filler Content in PVC
When manufacturing rigid PVC products, increasing filler content—especially with calcium carbonate (CaCO₃)—can lower material costs. However, it often reduces mechanical strength and flexibility. Fortunately, with the right strategies and additives like Chlorinated Polyethylene (CPE), you can improve the mechanical properties without compromising quality.
Why High Filler Content Affects Performance
Adding more fillers to PVC can cause:
- Lower impact and tensile strength
- Poor bonding and dispersion
- Brittleness and lower fusion efficiency
Use Finer Fillers
Fine calcium carbonate particles disperse more evenly in PVC. This reduces internal voids, increases contact area, and improves overall impact strength.
Apply Coatings on Fillers
Coatings like titanate or silane on CaCO₃ enhance its bonding ability with PVC. This leads to:
- Improved tensile strength
- Better filler dispersion
- Smoother processing
Add Chlorinated Polyethylene (CPE)
CPE is a high-performance impact modifier that:
- Contains 25% to 48% chlorine
- Forms small rubbery particles when heated with PVC
- Improves fusion, toughness, and low-temperature performance
How CPE Works:
- During mixing and heating, CPE coats PVC particles
- It forms dispersed rubber domains
- This enhances strength, fusion, and impact resistance
👉 Use 5 parts CPE per 100 parts PVC for best results. This allows you to add more filler while keeping products strong and tough.
Conclusion
