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Cotton and plaster casting material (plaster cast), 4ply Plaster casts consist of a cotton bandage that has been combined with plaster of paris , which hardens after it has been made wet. Plaster of Paris is calcined gypsum (roasted gypsum), ground to a fine powder by milling.
Roughcast or pebbledash is a coarse plaster surface used on outside walls that consists of lime and sometimes cement mixed with sand, small gravel and often pebbles or shells. [1] The materials are mixed into a slurry and are then thrown at the working surface with a trowel or scoop.
The New York-based Seabury & Johnson became known for its medicated plasters. [6]: 675 [5]: 15 Robert Wood Johnson represented the company at the 1876 World's Fair. [7] [8] There he heard Joseph Lister's explanation of a new procedure: antiseptic surgery. [5]: 31 Johnson parted ways with his business partner Seabury in 1885. [5]: 38
Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO 4 ·2H 2 O. [4] It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, drywall and blackboard or sidewalk chalk.
Naturally-occurring fibre bundles range in length from several millimetres to more than ten centimetres, [5] although industrially-processed chrysotile usually has shorter fibre bundles. The diameter of the fibre bundles is 0.1–1 μm , and the individual fibrils are even finer, 0.02–0.03 μm, each fibre bundle containing tens or hundreds of ...