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Old Jun 13, 2014, 07:36 PM
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What does epp mean?

What does epp mean?
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Old Jun 13, 2014, 07:40 PM
serial scratchbuilder
Granted's Avatar
Canada, BC, Mission
Joined Sep 2012
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Expanded polypropylene.
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Old Jun 13, 2014, 07:43 PM
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Pacific Northwest, USA
Joined Oct 2004
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The below is a cut and paste from an old posting on this web site:

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:


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.
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Old Jun 13, 2014, 08:07 PM
CNC Cutter
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United States, IN, Indianapolis
Joined Dec 2005
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EXPANDED implys that the raw beads are per-expanded to a density close to what
is expected in the final product.
Then those beads are injected into a mold where the heat expands them to the final density and fuses them all together.
Typically a Steam heat.

XPS or extruded polystyrene

EXTRUDED is a completely different process and results in a more homogeneous
and smoother end product.
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Old Jun 18, 2014, 07:58 PM
Flying Models for 51 Years!
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Georgia, United States
Joined Oct 2002
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EPP means Light Weight, Tough, Withstands Crashes, Easy to Repair, Easy to work with and in my opinion the Best all around Foam for RC Models with 36" Wingspans or less.

Bobby
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