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NATURAL CURVES SURFBOARDS |
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| STRUCTURAL ANATOMY of a SURFBOARD |
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A surfboard is a structural sandwich - specifically a foam sandwich.
It has a low density core and a high density skin. The low density cores are generally made of polyurethane foam or EPS foam. The high density skins are a composite of fiberglass and resin - either polyester resin or epoxy resin. Surfboards with polyurethane foam cores are generally glassed with polyester resin, but may be glassed with epoxy resin. Boards featuring EPS styrofoam cores are always glassed with epoxy resins as EPS foam is incompatable with polyester resin. The high density skins are reinforced by a stringer generally wood or high density foam in polyurethane foam boards and wood, high density foam, or reinforced composite material in EPS styrofoam boards. Stringers are an essential component in surfboard design. They function as a "sandwich beam" which keeps the skins of the bottom and deck from collapsing into the low density foam core. |
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A - Polyurethane or EPS foam core
B - Matrix of fiberglass and resin C - Thin layer or multiple layers of resin to fill, level, and seal the surfboard D - Stringer or "Sandwich Beam"" |
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