Recommendations for expandable fire stopping foam

UNG said:

Buy a professional foam gun and gun grade intumescent foam don't forget the foam cleaner to keep the gun clean

https://www.toolstation.com/p45-foam-gun/p84715

https://www.toolstation.com/b1-fire-rated-expanding-foam/p24885

https://www.toolstation.com/pu-foam-cleaner/p30658

The professional gun gives better control of the foam and the can can be left on the gun until the full can has been used

If you are only filling small holes then an intumescent sealant would probably better

https://www.toolstation.com/fire-mate-intumescent-acrylic-sealant-310ml/p58145

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Andy™ said:

not quite foam but these may be suitable

https://www.firesealsdirect.co.uk/intumescent-pillow.html

or for smaller holes

https://www.firesealsdirect.co.uk/intumescent-acrylic-sealant.html

or maybe these

https://cpc.farnell.com/polypipe/20c89/firebreak-conduit-20mm-x-300mm/dp/CB19053?st=conduit

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UNG said:

Your OP was asking about expanding foam if you are now looking at alternative fire stopping products then have a look at  https://envirograf.com/    they have a wide range of products to suit most if not all situations

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