Hi all.

Does anyone recognise or have any info about these type of intumescent strips?

I've not come across them before. The red face is quite coarse, a bit like sand paper. Found in a block of retirement flats built circa 1987.

Thanks

These appear to be the original intumescent strips dating back to 1987. Such seals these days have plastic sheathing to protect them.

You may find this of interest at the Intumescent Fire Seals Association https://www.ifsa.org.uk/resources