The idea that "a higher elongation at break is always better" is a common misconception. Elongation at break is a key indicator of material performance, but it must be considered in conjunction with other properties such as strength, hardness, modulus, aging resistance, and abrasion resistance to truly evaluate its "goodness."

High elongation at break implies that the material is soft, tough, can absorb a large amount of energy, is impact-resistant, and is less prone to brittle fracture.

However, excessively high elongation at break is often accompanied by low strength, low modulus, and susceptibility to permanent deformation.

Chlorinated polyethylene itself is a modified elastomer, and its properties can be adjusted within a wide range by the following factors:

- Molecular weight and degree of chlorination of the raw material PE: These are fundamental.

- Formulation system:

- Filler system: Adding fillers such as calcium carbonate and talc will significantly reduce elongation at break, but can reduce costs and improve rigidity, dimensional stability, and heat resistance.

- Plasticizing System: Adding plasticizers can significantly improve elongation at break, making the material softer, but it will reduce strength, modulus, and pull-out resistance.

- Vulcanization/Crosslinking System: Appropriate crosslinking can optimize performance, improving strength, elasticity (reducing permanent deformation), and heat resistance while maintaining a certain elongation.

- Protective System: Good antioxidants and stabilizers can prevent the material from becoming brittle due to aging during use (decreased elongation at break).

Elongation at break is not an isolated "the higher the better" indicator. It represents the material's ductility and toughness, but must be considered in conjunction with indicators such as tensile strength and modulus.

2. The key is the application. When evaluating or selecting chlorinated polyethylene materials, a comprehensive judgment should always be made based on the performance requirements of its end use, rather than simply pursuing the maximization of a single indicator.