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he differences between EPS and EPP foam


Per request, here are some ways to tell the difference between EPS and EPP foam. 

EPS stands for expanded polystyrene, otherwise know as styrofoam. Depron, fan fold foam, sturdiboard, and the blue and pink foams found at home centers, are all EPS. This foam is easy to cut, fairly easy to sand, fairly rigid, fairly brittle (cracks easily) and not very durable. If you press your fingernail into it, it will leave a permanent crease. If you hold a very small piece over a match, it will just collapse and dissappear. Regular CA glue will melt this foam, as will some types of spray adhesives and spray paints. Use foam safe CA on EPS foam. See this thread for glues that work on EPS:

https://www.rcgroups.com/forums/show...3&page=1&pp=15

EPP stands for expanded polypropylene. I know of no trades names for this foam other than EPP. This foam is more difficult to cut, very hard to sand, less rigid than EPS and much much more durable. If you press your fingernail into it, the dent will almost totally dissappear. If you hold a very small piece over a match, it will catch fire and burn. You can use any type of adhesive or paint on EPP, as long as it sticks. From my limited testing, polyurethane glues work the best on EPP, but epoxy, CA and many contact adhesives also work well.

I'll post some pictures of EPS and EPP a little later, or someone else can also post some pictures.