Thin, pliable, silica-based fabric that, when saturated in resin, forms the brittle skin on a surfboard. The raw materials in fiberglass are primarily sand, limestone, and clay, which are mixed and melted, strained into filaments, twisted into strands, and woven into a fabric that is chemically treated to bond with resin. Fiberglass was invented in Germany during World War I as a substitute for as...

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