For research and development scientists and product formulators, understanding the precise technical properties of chemical additives is paramount to innovating and improving end products. Chlorinated Polyethylene 135A (CPE 135A) is a sophisticated polymer additive that significantly enhances the performance profile of Polyvinyl Chloride (PVC). As a specialized chemical manufacturer, we provide detailed technical insights into our CPE 135A, helping formulators leverage its capabilities.

Chemical Composition and Structure: The Foundation of Performance

CPE 135A is derived from high-density polyethylene (HDPE) through a controlled chlorination process. The substitution of hydrogen atoms with chlorine atoms disrupts the crystalline structure of HDPE, transforming it into a soft, rubbery material. The chemical formula, often represented as [CH2-CHCl-CH2-CH2]n, highlights the presence of chlorine along the polymer backbone. The critical parameter for formulators is the chlorine content, typically maintained at 35±1%. This specific level of chlorination dictates its compatibility with PVC and its effectiveness in imparting desired properties.

Key Technical Properties and Their Impact on PVC

When formulators decide to purchase CPE 135A, they are looking for tangible improvements. Our CPE 135A offers a range of advantageous technical properties:

  • High Tensile Strength: With a tensile strength typically ≥6.0 MPa, it contributes to the overall mechanical integrity of the PVC matrix.
  • Exceptional Elongation at Break: An elongation of ≥600% means the material can stretch significantly before breaking, providing excellent flexibility and toughness. This is crucial for impact resistance.
  • Shore Hardness: A Shore A hardness of ≤65% indicates a relatively soft, elastomeric character that complements the rigidity of PVC.
  • Heat of Fusion: A low heat of fusion (≤2.0 J/g) suggests good processing characteristics and stability during melt processing.
  • Residue on Sieve: A low residue on sieve (≤2.0% at 0.9mm aperture) ensures high purity and minimal undesirable particulates, leading to smoother processing and better surface finish.
  • Volatile Matter Content: Low volatile matter (≤0.4% or 0.75% depending on grade) minimizes emissions during processing and ensures material stability.
  • Weatherability and UV Resistance: The polymer backbone is inherently resistant to degradation from UV radiation and ozone, a significant benefit for outdoor applications like window profiles.
  • Flame Retardancy: The chlorine content contributes to the material's ability to self-extinguish when exposed to flame, improving safety.

Formulation and Application Insights

To leverage these properties, R&D scientists often incorporate CPE 135A into PVC formulations for products such as window profiles, pipes, fittings, and cable jacketing. Its compatibility with PVC is superior due to similar polar groups, allowing it to effectively absorb impact energy and prevent crack propagation. When specifying materials, it is advisable to buy from manufacturers who provide detailed technical data sheets and certificates of analysis. This ensures that the chosen grade of CPE 135A meets the exact requirements for your formulation, whether for impact modification, improving low-temperature performance, or enhancing overall durability. Understanding the processing window and potential synergistic effects with other additives like stabilizers and lubricants is also key.

As a dedicated supplier, we encourage formulators to contact us for samples and detailed technical specifications. Exploring our range of high-quality CPE 135A can unlock new possibilities for your PVC product development. Partner with us to enhance your R&D efforts with superior chemical additives.