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2026

PVC/CPVC stabilizer

PVC/CPVC has to be heated to become a product.

But how much heat is too much?

That's where things get interesting.

During processing, PVC/CPVC is heated to make it soft enough to be shaped into pipes, profiles, cables and other products.

The problem starts when the heat goes beyond what the formulation can handle.

PVC/CPVC doesn't just keep getting softer.

It starts to break down.

The process is called dehydrochlorination.

As PVC/CPVC is exposed to excessive heat, hydrogen chloride (HCl) begins to leave the polymer chain. And once degradation starts, it can accelerate, making the material increasingly unstable.

You can often see the damage before you measure it.

The surface starts losing its gloss.

The colour begins to change.

White or light-coloured PVC/CPVC can move towards yellow, then brown, and eventually much darker shades as degradation progresses.

But the colour change is only the visible part.

The polymer is changing at a molecular level too, and that can affect its mechanical properties, processing behaviour and long-term performance.

So how does PVC/CPVC survive the heat required to process it?

PVC/CPVC Stabilizers

A properly designed stabilizer system helps control the degradation reactions that occur when PVC/CPVC is heated, including by interacting with the HCl generated during processing.

Think of it as giving PVC/CPVC a wider safety window

→Enough heat to shape the material.

→Enough stability to prevent that heat from destroying it.

And that is really what thermal stability in PVC/CPVC comes down to

Not avoiding heat but controlling what heat does to the material.