What Are PVC Heat Stabilizers?

PVC heat stabilizers are additives that prevent degradation caused by heat during the processing and use of PVC. When PVC is processed at high temperatures (170-200°C), the polymer chains start to break down, leading to issues such as color change, decreased mechanical properties, and gas emission. Heat stabilizers enhance the thermal stability of PVC by delaying or preventing these degradation reactions.

Benefits of PVC Heat Stabilizers

  • Prevent color change during PVC processing.
  • Preserve the mechanical properties of PVC (durability, hardness, etc.).
  • Reduce gas emission resulting from thermal degradation.
  • Extend the lifespan of PVC.

Applications of PVC Heat Stabilizers

PVC heat stabilizers are used in every area where PVC is utilized. Major applications include:

  • Pipe and Profile Production: PVC pipes and profiles are used in construction, water supply, and electrical installations.
  • Window and Door Profiles: PVC window and door profiles are widely used for energy efficiency and thermal insulation.
  • Cable and Wire Insulation: PVC cable and wire insulation is used in electrical installations.
  • Flooring: PVC flooring is preferred for its durability and ease of cleaning.
  • Soft PVC Products: Toys, raincoats, bags, and shoes made from PVC also contain heat stabilizers.

Types of PVC Heat Stabilizers

PVC heat stabilizers are not composed of a single substance but are generally a mixture of multiple additives. The most commonly used PVC heat stabilizers include:

Lead-Based Stabilizers

These were the most commonly used type in the past. However, their use is decreasing due to lead's toxicity to humans and the environment.

Calcium-Zinc Based Stabilizers

Developed as an alternative to lead-based stabilizers, they are non-toxic and perform well.

Organic Stabilizers

More expensive compared to lead and calcium-zinc based stabilizers, but they offer better processability and reduced gas emission.

The choice of PVC heat stabilizers depends on the intended use of the PVC and the processing method.

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