Search results
Results From The WOW.Com Content Network
Gypsum plaster, [12] also known as plaster of Paris, [13] is a white powder consisting of calcium sulfate hemihydrate. The natural form of the compound is the mineral bassanite . [ 14 ] [ 15 ]
The word gypsum is derived from the Greek word γύψος (gypsos), "plaster". [9] Because the quarries of the Montmartre district of Paris have long furnished burnt gypsum (calcined gypsum) used for various purposes, this dehydrated gypsum became known as plaster of Paris. Upon adding water, after a few dozen minutes, plaster of Paris becomes ...
Antonius Mathijsen (November 4, 1805 – June 15, 1878) was a Dutch army surgeon who first used plaster of Paris to fixate broken bones in a plaster cast. Biography
With judicious heating, gypsum converts to the partially dehydrated mineral called bassanite or plaster of Paris. This material has the formula CaSO 4 ·( n H 2 O), where 0.5 ≤ n ≤ 0.8. [ 8 ] Temperatures between 100 and 150 °C (212–302 °F) are required to drive off the water within its structure.
Chalkware is an American term for popular figurines either made of moulded plaster of Paris (usually) or sculpted gypsum, ... cartoonish characters and potty humor. ...
After a boring day at work, computer data entry worker Paul Hackett strikes up conversation with a stranger named Marcy Franklin in a café in New York City. Marcy tells him that she is living in SoHo with a sculptor named Kiki Bridges, who makes and sells plaster-of-Paris paperweights resembling cream cheese bagels and leaves him her number ...
Gypsum mortar, also called plaster of Paris, was used in the construction of many ancient structures. It is made from gypsum, which requires a lower firing temperature. It is therefore easier to make than lime mortar and sets up much faster, which may be a reason it was used as the typical mortar in ancient, brick arch and vault construction.
It is chiefly made of plaster of Paris (powdered gypsum), with a little cement, glycerin, and dextrin, mixed with water until it is about as thick as molasses. When staff is cast in molds, it can form any shape. To strengthen it, coarse cloth or bagging, or fibers of hemp or jute, are put into the molds before casting. It becomes hard enough in ...