UPVC vs. CPVC: Key Differences & Best Uses Explained

UPVC stands for unplasticised polyvinyl chloride: rigid, no plasticisers added. CPVC is chlorinated polyvinyl chloride: the same base resin plus extra chlorine, making it stronger under heat.

Homeowners hear “PVC” and assume one size fits all—then wonder why the hot-water pipe warps. Contractors know the mix-up can trigger leaks, angry callbacks, and flooded kitchens.

Key Differences

UPVC stays rigid up to 60 °C and handles cold supply, waste, and window frames. CPVC survives 93 °C, so it’s certified for hot-water lines, fire-sprinklers, and industrial chemicals.

Which One Should You Choose?

Cold water or framing? Grab UPVC—cheaper, easier to glue. Hot water, fire systems, or aggressive chemicals? Pay the CPVC premium and sleep without burst-pipe nightmares.

Can CPVC replace every UPVC pipe?

No. CPVC costs more and is overkill for outdoor drainage or window profiles.

Are UPVC and CPVC fittings interchangeable?

No. They use different solvent cements and have slightly different outer diameters.

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