Closed cell foam

rampantbunny · 23-08-2025 10:54AM #1

Anyone familiar with or can recommend where to buy closed cell gun grade (or standard aerosol applied) foam? Looking to buy online if I can and only need maybe 3 or 4 cans. Or if you could DM me some specific products that are closed cell/airtight that would be a good start because I'm finding it difficult to identify suitable products to start with nevermind where to purchase.

I'm looking to seal around a pipe with closed cell/airtight foam to see if it helps reduce odour. It's a test before I consider ripping things apart and relocating the pipe.

Lumen · 23-08-2025 10:58AM

This

https://www.soudal.ie/pro/products/expanding-foam/1k-pu-foams/soudafoam-gun-win-door-sws

I think it's this variant (SWS) specifically which is airtight, there's another variant with almost identical labelling which makes no claims about airtightness.

Check the label.

Also recommend a can of PU gun cleaner unless you want to risk destroying your gun

rampantbunny · 23-08-2025 11:19AM

And just after posting my query, I've found a product multi pack that touts itself as suitable for airtightness in passive home construction. I will purchase and cross fingers that it solves my issue.

rampantbunny · 23-08-2025 11:23AM

https://www.boards.ie/discussion/comment/123746944#Comment_123746944

Thanks Lumen. I hadn't refreshed so didn't see your response til now. That's one of the products I've come across. Couldn't see on the data sheet what the closed cell percentage was but for another product from ARC they listed as 70%.. So wasn't going to purchase the soudal product if the data sheet wasn't going to list a similar or better spec.

rampantbunny · 23-08-2025 11:34AM

For anyone with a similar query in future I've come across these in my search.

https://passivehousesystems.ie/shop/adhesives-primers-sealants/phs-airtight-foam/

Soudal soudafoam-gun-win-door-sws

ARC (70% closed cell)

Lumen · 23-08-2025 11:58AM

https://www.boards.ie/discussion/comment/123747001#Comment_123747001

does the % matter?

I've used the Soudafoam stuff to fill anything from tiny nail holes to gaping 6 inch voids, and I assume the other ingredients are important for other properties, like adhesion or expansion or whatever.

The important thing in the datasheet is the tested performance criteria.

Closed cell foam

Comments