• 27.11.2025

PVC compounds are engineered blends designed to deliver specific performance characteristics. Proper formulation is essential for processing efficiency, mechanical strength and long-term durability.

1. Core Components of PVC Compounds

1) PVC Resin (K-Value)

• K65–67 → flexible applications

• K58–60 → transparency

• K70–74 → medical & extra-soft PVC

2) Plasticizers

Determine softness, flexibility and processability.

• DOTP → general purpose

• DINP → cables & hoses

• TOTM → high-temperature resistance

• Benzoates → fast-fusing applications

3) Stabilizers

Provide heat resistance and color stability during processing.

• Ca-Zn → lead-free standard

• Tin stabilizers → excellent clarity for transparent applications

4) Fillers (Calcium Carbonate, Talc)

• Reduce cost

• Improve mechanical strength

• Adjust hardness

5) Lubricants

• Smoother processing

• Better surface finish

• Easier mold release

6) Pigments

• Color consistency

• UV resistance

2. Application-Based Formulation Examples

Cable Compound

• DOTP or DINP

• Ca-Zn stabilizer

• Flame retardant (optional)

• Calcium carbonate

Medical Compound

• Non-phthalate plasticizers (DINCH / TOTM)

• Tin stabilizer

• Low filler for clarity

Footwear Compound

• DOTP + benzoate blend

• High K-value PVC

• Fillers + internal/external lubricants

3. Effects of Poor Formulation

• High migration

• Yellowing

• Processing instability

• Brittleness

• Lower flame resistance

Conclusion

PVC compounding is a precise engineering process. Selecting the right additives ensures optimal performance, cost efficiency and regulatory compliance.