For R&D scientists and product formulators working with PVC, selecting the right impact modifier is critical to achieving desired product characteristics and ensuring manufacturing efficiency. Chlorinated Polyethylene (CPE) 135A is a prominent choice, and a deep understanding of its technical specifications is paramount. This article provides essential insights into the key parameters of CPE 135A, helping professionals make informed decisions when purchasing this versatile additive.

CPE 135A is a white powder characterized by its chemical composition and physical properties, which dictate its performance as a PVC impact modifier. The most significant parameter is its chlorine content, typically ranging from 34% to 36% (often specified as 35±1% or 35±2%). This level of chlorination is crucial for its effectiveness in improving the impact strength and flexibility of PVC, while also contributing to its oil resistance and flame retardancy. Manufacturers offering CPE 135A should clearly state this specification.

Another important physical property is the appearance, which is consistently described as a white powder. This visual characteristic is standard across reputable suppliers. Further critical specifications include volatile matter content (typically ≤ 0.5% or ≤ 0.75%), indicating the amount of residual moisture or low molecular weight components, which should be minimized for optimal processing and product stability. High volatile matter can lead to processing issues and affect the final product's properties.

Residue on sieve (e.g., ≤ 2.0% for a 0.9mm sieve) and the number of impurity particles (e.g., ≤ 20-30 per 100g) are indicators of the product's purity and the effectiveness of its manufacturing and filtration processes. These parameters ensure that the CPE 135A will not introduce defects into the PVC matrix, leading to smoother finishes and better mechanical properties.

For processing considerations, Mooney viscosity (ML 1+4, 125°C), often specified as ≤ 96, is a key indicator of its rheological behavior. A suitable Mooney viscosity ensures good dispersibility and processability within the PVC compound. Other mechanical properties like tensile strength (e.g., ≥ 6.0 MPa) and elongation (e.g., ≥ 600%) provide insights into the inherent strength and elasticity of the CPE material itself, which translates into the improved properties of the final PVC product.

When sourcing CPE 135A, it is advisable to request detailed technical data sheets from potential suppliers. Comparing these specifications alongside pricing and availability from manufacturers in China allows procurement specialists and formulators to select the optimal grade that meets both performance requirements and cost objectives. For those looking to buy CPE 135A, confirming these technical details is a non-negotiable step for success.