General view of employee Mildred Wells using a Hart moisture meter to measure the moisture in a sample of carboxymethyl cellulose (CMC) at the Hercules Powder Company plant in Hopewell, Virginia. Also known as cellulose gum or tylose powder, CMC is a cellulose derivative commonly used as a thickening agent or to stabilize emulsions in a range of materials, including toothpaste, water-based paints, detergents, and various paper products.
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.
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Hercules Incorporated. “Hart Moisture Meter in Use at Hercules Hopewell Plant,” November 1961. Photographs from the Records & Ephemera of Hercules Incorporated, Box 1, Folder 38. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/x633f169f.
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