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Production of Chlorinated PolyVinyl Chloride (CPVC) from PVC and chlorine requires incorporating about one part chlorine in 10 PCV to achieve around 63% chlorine mass CPVC. This reaction is "initiated" (according to the Plastic Pipe Institute) with UV and, according to Wikipedia "thermal or UV". However, I have not located a source that says whether this energy is catalytic or endothermic and if endothermic, how much energy is required.

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  • $\begingroup$ It is catalytic, as you only need to break the first chlorine-chlorine bond and then, the entire reaction is a chain reaction. $\endgroup$
    – Mäßige
    Aug 31, 2023 at 15:03

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