This fiberglass tape is manufactured under the highest manufacturing standards utilizing high quality, electrical grade, continuous filament fiberglass yarns which have been twisted and plied. Saylor glass tapes retain 50% of their tensile strength at 340 °C. The construction is commonly referred to as medium weave. - These tapes are unfinished to allow maximum wet out. Saylor Breyden glass tapes are manufactured in an ISO 9001 facility. Fiberglass tape edges have been treated with a resin to eliminate fraying and loose fibers.