TY - MANSCPT DB - Science History Institute DP - Science History Institute M2 - Courtesy of Science History Institute. Rights: No Known Copyright TI - Polarized light test at Hercules Parlin plant ID - 02870w72j AU - Hercules Incorporated DA - 1945/01// YR - 1945 AV - Photographs from the Records & Ephemera of Hercules Incorporated, Box 2, Folder 25 VL - Photographs from the Records & Ephemera of Hercules Incorporated, Box 2, Folder 25 AN - Photographs from the Records & Ephemera of Hercules Incorporated, Box 2, Folder 25 UR - https://digital.sciencehistory.org/works/02870w72j AB - Close-up view of several testing samples in the Plastics Laboratory at the Hercules Powder Company plant in Parlin, New Jersey. Per notations accompanying the photograph, the samples were placed in a testing box and exposed to polarized light, a standard method for exposing residual stresses that arise as molten polymer is cooled and shaped. The Parlin plant commonly produced ethyl cellulose, nitrocellulose, and cellulose acetate, which were purchased by a variety of public and private industries as a raw material for use in plastics, films, lacquers, and other materials. Formed in 1912 as part of an anti-trust settlement with DuPont, the Hercules Powder Company (later Hercules Inc.) initially specialized in the manufacture of explosives and smokeless powders and subsequently diversified its business to encompass a variety of industrial products, including pine and paper chemicals, synthetics, pigments, polymers, and cellulose. KW - Chemical industry KW - Scientific apparatus and instruments KW - Research, Industrial KW - Hercules Incorporated KW - Corporations KW - Plastics--Testing LA - ER -