Datatek
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As it's for aquariums, it's unlikely to be UV stable.Pop into your local aquarium/tropical fish shop and get a sheet of filter foam.
When I got mine a couple of years ago it cost £4.50 and when cut into strips there's was enough to to three disco plenum's.
The was three grades of foam at the time easy seen as they are different colours, you don't want to get the very dense one as it may restrict air flow into the heater