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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 wood or high density foam stringer 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 "I 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" featuring the
design of the board
B - Matrix of fiberglass and resin "skin" to seal and reinforce the shape C - Thin layer or multiple layers of resin to fill, level, and further seal the board D - "I" Beam Stringer to support the skin of the top and bottom from collapsing on or into each other |
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