Original insulation trade vintage catalog for WILMINGTON FIBRE SPECIALTY COMPANY. was located in New Castle, DE. Manufacturers of Fiberoid, a strong insulating material also known as fish paper, manufactured in sheets, rolls and coils. Vulcanized fibre is an all-purpose insulation, meets and exceeds specifications of the Army and Navy. Ohmoid is a laminated phenolic insulation manufactured in five different grades. Disbound from a large 1948 electrical construction materials book, this unique old one page technical brochure would display wonderfully matted and framed. A marvelous addition to your retro electric equipment library.