Calcium hydrogen phosphate

  • Calcium acid phosphate
  • Calcium dibasic phosphate
  • Calcium hydrogen orthophosphate
  • Calcium monohydrogen phosphate
  • Calcium phosphate (1:1)
  • Calcium phosphate
Formula
CaHPO4
Structure
Description
White crystals or crystalline powder.
Uses
Control acidity in powdered drink mixes, ingredient in effervescent tablets, as a plastics stabilizer, and in ceramics. Its single largest application is as a leavening agent in bread, cake mixes, and self-rising flour.

Registry Numbers and Inventories.
CAS
7757-93-9
EC (EINECS/ELINCS)
231-826-1
Merck
12,1739
Beilstein/Gmelin
10909 (G)
Swiss Giftliste 1
G-7156
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CaHO4P
Formula mass
136.06
Melting point, °C
370
Decomposition point, °C
230
Density
2.89 g/cm3 (20 C)
Solubility in water
0.1 g/L

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Insufficient information.
Handling
Wash thoroughly after handling. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Wash clothing before reuse.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to minimize contact with skin.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Provide ventilation.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents.
Decomposition
Oxides of phosphorus, irritating and toxic fumes and gases, calcium oxide.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. To extinguish fire, use water, dry chemical, chemical foam, or alcohol-resistant foam. Use agent most appropriate to extinguish fire.
Fire potential
Nonflammable.
Health
2
 
Flammability
0
 
 
Reactivity
0
 

Health.
Poison_Class
-
Exposure effects
   Ingestion
Causes gastrointestinal irritation with nausea, vomiting and diarrhea.
   Inhalation
Dust is irritating to the respiratory tract.
   Skin
Causes skin irritation.
   Eyes
Causes eye irritation. May result in corneal injury.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid if cough or other symptoms appear. DO NOT use mouth-to-mouth respiration. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
   Skin
Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists. Wash clothing before reuse.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
HS Code
2835 25 10