CPE 135A (Chlorinated Polyethylene 135A) is a high-performance polymer modifier primarily used to enhance the toughness and impact resistance of rigid polyvinyl chloride (PVC) products. Its core performance characteristics can be summarized as follows:

1. Basic physical properties

Appearance and Form: White powder, non-toxic, with an apparent density typically ranging between 0.48-0.60 g/cm³, facilitating processing and mixing.

Chlorine content: 35%-36%, this proportion endows it with both elasticity and PVC compatibility, making it a key parameter for impact modifiers. A chlorine content that is too low (<25%) results in poor PVC compatibility, while a content that is too high (>40%) may cause loss of elasticity.

Thermal stability: The thermal decomposition temperature is ≥165°C, higher than the processing temperature of PVC (typically 160-180°C), ensuring no decomposition during processing.

2. Mechanical Properties

Tensile strength: ≥8 MPa (some data reaching 9.95 MPa), indicating its ability to withstand significant external forces without breaking.

Elongation at break: 650%-1070%, demonstrating excellent flexibility and tear resistance, suitable for applications requiring deformation.

Shore hardness: ≤65 Shore A, with a relatively soft texture, providing the product with excellent tactile feel and impact resistance.

3. Processing and Compatibility

Dispersibility: Easily mixes with resins such as PVC, PE, SAN, and ABS to form a uniform system, reducing processing defects.

Plasticization Promotion: Adding more than 5 parts of CPE 135A to PVC can significantly reduce plasticization time and improve production efficiency.

Low-temperature performance: The glass transition temperature is approximately 10°C, significantly lower than PVC's 80°C, ensuring flexibility even in cold environments.

4. Weather and Chemical Resistance

Resistance to aging: The stable molecular structure resists degradation when exposed to UV radiation and ozone over extended periods, thereby prolonging the service life of the product.

Chemical corrosion resistance: It exhibits excellent resistance to acids, alkalis, salts, and other chemicals, making it suitable for outdoor or chemical industrial environments.

Flame retardancy: Inherent flame-resistant properties, releasing hydrogen chloride gas during combustion to inhibit fire spread.

5. Application Areas

PVC rigid products: profiles, pipes, pipe fittings, door and window profiles, etc., significantly enhancing impact resistance and toughness.

Other polymers: blended with PE, PS, rubber, etc., to improve physical properties and expand application scope.

Special Requirements: Applications requiring high flexibility and weather resistance, such as wires, cables, and thin-walled products.

6. Summary of Performance Advantages

Balanced Comprehensive Performance: Optimized between elasticity, strength, and weather resistance to meet diverse needs.

Easy to process: easily dispersible, promotes plasticization, and reduces production costs.

Environmental Safety: Non-toxic, compliant with environmental standards, suitable for food contact-grade products.

Typical Application Cases

PVC Door and Window Profile: After adding CPE 135A, the impact resistance of the profile increases by more than 30%, making it suitable for use in cold regions.

Outdoor piping: Its weather resistance and chemical resistance make it the preferred modifier for water supply and drainage pipes.

Wire and Cable: Enhance the flexibility and aging resistance of the insulation layer to improve safety.

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