| http://www.w3.org/ns/prov#value | - Several other rigid materials or mixes of rigid materials can be used to produce rigid insulating layers, including prepregs (short for preimpregnated) such as, for example, flame retardant (FR) 2 (cellulose paper impregnated with phenolic resin), FR-3 (cotton paper impregnated with epoxy), FR-4 (epoxy-resin impregnated woven glass cloth), FR-5 (woven glass impregnated with epoxy), etc.
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