26499-65-0

Basic information

• Product Name: Plaster of Paris (Ca(SO4).1/2H2O)
• Synonyms: Plaster of Paris (Ca(SO4).1/2H2O);Plaster of Paris respirable dust;Plaster of Paris total inhalable dust;Ai3-01697;Crystacal;Densite;Densite (gypsum);Fgr
• CAS NO: 26499-65-0
• Molecular Formula: Ca. H2 O4 S . 1/2 H2 O
• Molecular Weight: 290.2965
• Mol File: 26499-65-0.mol
• Article Data: 0

Chemical Properties

• Melting Point: 163 °C
• Boiling Point: 330°Cat760mmHg
• Flash Point: °C
• Appearance: /
• Density: g/cm³
• Storage Temp.: -20°C
• CAS DataBase Reference: Plaster of Paris (Ca(SO4).1/2H2O)(CAS DataBase Reference)
• NIST Chemistry Reference: Plaster of Paris (Ca(SO4).1/2H2O)(26499-65-0)
• EPA Substance Registry System: Plaster of Paris (Ca(SO4).1/2H2O)(26499-65-0)

Safety Data

• Hazardous Substances Data: 26499-65-0(Hazardous Substances Data)

Usage

General Description

White or yellowish, finely divided, odorless powder consisting mostly or entirely of calcium sulfate hemihydrate, CaSO4·1/2H2O. Forms a paste when Plaster of Paris (Ca(SO4).1/2H2O) is mixed with water that soon hardens into a solid. Used in making casts, molds, and sculpture. Generally non-toxic.

Reactivity Profile

Plaster of Paris (Ca(SO4).1/2H2O) is non-flammable and non-combustible. Has generally low chemical reactivity but can act as an oxidizing agent under extreme conditions. Decomposes at high temperature to generate toxic oxides of sulfur. Reacts exothermically but slowly with moisture in the air or water to form gypsum CaSO4.2H2O.