PVC Stabilizer Failures & Troubleshooting
PVC Stabilizer Failures & Troubleshooting
Stabilizers play a vital role in PVC processing. Incorrect stabilizer selection or dosage can lead to yellowing, plate-out, odor formation, degradation and poor mechanical properties.
1. Common Stabilization Problems
1) Yellowing / Color Deviation
Causes:
Low stabilizer dosage
Incorrect Ca-Zn ratio
Excessive heat exposure
Improper lubricant system
Fix:
Optimize Ca-Zn stabilizer
Reduce processing temperature
Adjust lubricant package
2) Plate-Out Formation
Causes:
Poor heat stability
High volatility additives
Lubricant incompatibility
Fix:
Use high-stability Ca-Zn systems
Switch to lower-volatility plasticizers
Modify lubricant ratios
3) Odor / Gas Emission
Causes:
Plasticizer incompatibility
Insufficient stabilization
Low purity raw materials
Fix:
Choose DOTP/TOTM
VOC-optimized stabilizers
Cleaner PVC resin
Conclusion
Most stabilization problems can be solved through proper stabilizer selection, plasticizer compatibility and optimized processing conditions.