Best foam to use in a silencer

[Brakoo]

I just recently got a new KAC QD silencer for my CQBR and this one had no foam at all inside so I was just wondering what do you guys usually use ? If I'm gonna go out and buy something I'd rather have something that works well on the first try.

Thanks in advance for any help provided.

[Short Round]

Pipe foam

I use it in mine, it fits nice and snug in the silencer. Very good to use with a inner barrel that extends into the silencer. You just need to cut it to fit into the silencer as atleast for me it was too big. It may also make a different noise then your gun usually sounds like. The foam I used actually partially silenced the noise when it fires (not the gearbox lol) and makes a thumping noise, its pretty cool

[ex]

Closed Cell foam is probably the best to use since its rigid and easy to cut. Just use an old camp mat (you know the blue ones).

[Boyso]

Yeah but I'm pretty sure an open-cell one would help reduce the sound even more.

(If you can fit it in the silencer without blocking the BB path...)

[ThunderCactus]

closed cell foam doesn't do crap to reduce noise, open cell is the way to go!

[Brakoo]

I ended up going with open cell and bought some of that pipe insulating foam and it did a great job. Not only it works great but it was easy to trim sue to one side being opened to help slide it over the pipe you're trying to insulate.

I picked up a T shaped one at Home Depot for 1.59$ and it was enough to do the whole silencer.