In case of fire in the surroundings: use appropriate extinguishing media.
EXPLOSION
EXPOSURE
Inhalation
Cough.
Local exhaust or breathing protection.
Fresh air, rest.
Skin
Rinse and then wash skin with water and soap.
Eyes
Redness. Pain.
Safety spectacles.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion
Do not eat, drink, or smoke during work.
Rinse mouth.
SPILLAGE DISPOSAL
PACKAGING & LABELLING
Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting. Personal protection: P1 filter respirator for inert particles.
EMERGENCY RESPONSE
SAFE STORAGE
IMPORTANT DATA
Physical State; Appearance WHITE CRYSTALLINE POWDER OR LUMPS.
Occupational exposure limits TLV: (as total dust containing no asbestos and <1 % crystalline silica) 10 mg/m³ as TWA; (ACGIH 2004). MAK: (as respirable fraction of the aerosol, without fibers) 6 mg/m³; (DFG 2004).
Inhalation risk A nuisance-causing concentration of airborne particles can be reached quickly when dispersed, especially if powdered.
Effects of short-term exposure May cause mechanical irritation.
Effects of long-term or repeated exposure Lungs may be affected by repeated or prolonged exposure to dust particles if crystalline silica is present.
PHYSICAL PROPERTIES
ENVIRONMENTAL DATA
Melting point: (see Notes) 100-150°C Density: 2.3 g/cm³ Solubility in water, g/100 ml at 25°C: 0.24
NOTES
Gypsum is the natural form of the product and may contain crystalline silica. CAS 10101-41-4 refers to Calcium sulfate precipitate, and CAS 7778-18-9 refers to Calcium sulfate anhydrous. The apparent melting point caused by loss of crystal water is given. Melting point for the anhydrous form is 1450 °C.
