I found an The airplane modeling site advertising various foams and it referenced Dow “Spyderfoam” and described it as surfboard foam. I searched the archives for the “Spyderfoam” moniker but it came back with a donut (0). Can anyone enlighten me on this stuff? I can’t really tell from the site whether it is EPS or XPS (although I suspect from the comparison to the blue foam that it is XPS).
I’ll cut and paste the details below, but here’s the link in case you’re curious http://www.flyingfoam.com/FoamTypes.html
"Types of Foam:
We stock a number of types of foam, and some types are available in different densities:
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1.0# EPS
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1.5# EPS
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2.0# EPS
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Owens Corning Pink Foam (1.8# density)
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Dow Blue Square Edge (1.8# density)
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Dow Blue Hi-Load 40 (2.0# density)
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Surfboard Foam (AKA Spyderfoam, 2.3# density)
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1.3# EPP
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1.9# EPP
"Surfboard Foam:
Surfboard foam is manufactured by Dow, and is a polystyrene foam similar in feel and texture to blue foam. The big difference is that surfboard foam has grain structure that runs vertically through the sheet. Because of the grain structure, it has a compression rating greater than 60 PSI, which is greater than other types of blue or pink foam. Spyderfoam density is 2.3 # per cubic foot.