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PU Foam and T&E cable

Just been told of PVC cable that turned almost black where it was in contact with some sort of foam sealing the end of a underground duct.
Well, we all know what polystyre foam (or expanded polystyrene) can do to PVC cables - maybe that's what this foam was?

Kind Regards, John
 
You can buy fire rated expanding foam. I use it quite a lot these days. It's great stuff.
 

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