Why is it so difficult to reach 60% chlorine content in CPVC pipe and dry mix?

Why did the national standard lower the chlorine content of CPVC pipe and dry mix from 60% to 55%?

Why is it so difficult to reach 60% chlorine content in CPVC?

Chlorine content control difficulties

• Characteristics of raw materials: The chlorine content of CPVC is completely dependent on the resin used, while commonly used additives such as stabilizers, lubricants and processing aids do not contain chlorine.
• Processing Difficulty: CPVC is at least two times more viscous than PVC and is more prone to paste, which increases its processing complexity.
• Formulation limitations: In order to ensure that the chlorine content of the final product is not less than 60%, the total amount of additives is required to be no more than 7%, which puts forward higher requirements for the design of formulations.

How to achieve 60% chlorine content in CPVC products

Selection of high-quality raw materials: liquid-phase CPVC resin chlorine content is usually between 64% and 67%, which is more common. Solid-phase CPVC resin chlorine content can be more than 68%, but the color control is more difficult.

Application of efficient additives: Choose additives with small amount and high efficiency to reduce the dilution of chlorine content.

Innovative formulation ideas: Abandon the traditional PVC formulation mode, reduce the use of non-essential ingredients under the premise of ensuring processing convenience, so as to improve the overall chlorine content level.

Rallychem Chemicals CPVC product solutions

Rallychem Chemical’s polyester wax and polyester homopolymer formulations are highly effective additives for CPVC production, providing excellent performance at lower usage levels, thereby reducing costs.

The use of polyester waxes and polyester homopolymers stabilizes the chlorine content of CPVC products at 58-59%, approaching 60%. In addition, we provide one-stop service to help customers reduce the need for production testing and adjustments, and provide them with efficient and economical production formulations and solutions.