In the PVC industry, stabilizers play a critical role in protecting polyvinyl chloride from thermal degradation during processing. However, the performance of a PVC stabilizer system does not rely solely on active stabilizing agents. Functional fillers such as calcium carbonate (CaCO₃) significantly influence processing behavior, cost efficiency, and final product appearance.

At Tan Ky Mineral Processing Joint Stock Company, we supply high-quality calcium carbonate designed specifically for PVC stabilizer and PVC compound applications, ensuring both performance enhancement and cost optimization.

What is a PVC Stabilizer?

PVC (Polyvinyl Chloride) is highly sensitive to heat. During extrusion, injection molding, or calendaring, PVC can degrade and release HCl, leading to:

• Yellowing or discoloration

• Reduced mechanical strength

• Surface defects

• Lower product lifespan

PVC stabilizers are added to prevent degradation, maintain color stability, and improve heat resistance. In modern stabilizer systems (Ca-Zn, Pb-free systems), mineral fillers such as calcium carbonate help optimize formulation balance and processing performance.

Why Calcium Carbonate is Used in PVC Stabilizers

1. Cost Optimization

Calcium carbonate is a cost-effective mineral filler that reduces overall formulation cost while maintaining mechanical and processing properties. By partially replacing more expensive ingredients, manufacturers can achieve competitive pricing without compromising quality.

2. Improved Dispersion

Fine and well-coated CaCO₃ enhances dispersion within the stabilizer blend and PVC compound. Proper dispersion results in:

• Uniform mixing

• Reduced agglomeration

• Stable extrusion performance

• Consistent surface finish

Stearic coated grades further improve compatibility with PVC resin.

3. Processing Performance Enhancement

Optimized particle size and oil absorption contribute to:

• Lower processing torque

• Better melt flow behavior

• Reduced die build-up

• Improved extrusion stability

This is especially important in pipe, profile, cable, and rigid sheet applications.

4. Color Stability and Whiteness Control

For white PVC pipes, profiles, and fittings, color consistency is critical.

Key parameters include:

• L* (Lightness value)

• b* (Yellow/Blue index)

• Whiteness index

• ΔE (Color difference between batches)

High L* and low, stable b* values help maintain bright and clean white appearance in finished products.

Key Technical Specifications for PVC Stabilizer Applications

When selecting calcium carbonate for PVC stabilizers, manufacturers should evaluate:

✔ Particle Size Distribution

• 1.5–3 µm → Premium applications

• 3–5 µm → Cost-effective formulations

✔ Whiteness & Color Values

• High L* value

• Low positive b* value

• Minimal batch-to-batch deviation

✔ Oil Absorption

Typical range: 15–22 g/100g
Balanced oil absorption ensures optimal formulation efficiency.

✔ Surface Treatment

• Uncoated for general applications

• Stearic coated for improved hydrophobicity and dispersion

Why Choose Tan Ky Mineral?

As a trusted mineral manufacturer in Vietnam, Tan Ky Mineral Processing Joint Stock Company offers:

✔ Stable High-Whiteness Limestone Source

Carefully selected raw materials ensure consistent brightness and purity.

✔ Advanced Grinding & Classification Technology

Modern production lines provide controlled particle size distribution and narrow PSD range.

✔ Stearic Coating Technology

Uniform surface treatment improves compatibility with PVC systems.

✔ Strict Quality Control

• Batch-to-batch color comparison

• Laboratory testing before shipment

• COA provided for every lot

✔ Export Experience

Serving international markets with stable quality and professional documentation.

Applications in PVC Industry

Our calcium carbonate for PVC stabilizers is widely used in:

• PVC pipes

• PVC window profiles

• PVC cable compounds

• PVC fittings

• Rigid PVC sheets

By integrating high-quality CaCO₃ into stabilizer formulations, manufacturers achieve improved thermal stability, enhanced whiteness, and optimized production cost.

Calcium carbonate is not merely a filler in PVC stabilizer systems—it is a performance enhancer and cost-control solution. Selecting the right grade with controlled particle size, stable color values, and optimized oil absorption can significantly improve both processing efficiency and final product quality.

With consistent raw materials, modern technology, and strict quality management, Tan Ky Mineral Processing Joint Stock Company is committed to delivering reliable calcium carbonate solutions for the global PVC industry.

📩 Contact Us

Looking for high-quality calcium carbonate for your PVC stabilizer formulation?

Contact Tan Ky Mineral today to request a technical data sheet or free sample for testing.