IPCS INCHEM Home
PHOSPHORUS PENTOXIDEICSC: 0545
September 1997
CAS #: 1314-56-3Diphosphorus pentoxide
Phosphoric anhydride
Phosphorus pentaoxide
UN #: 1807
EINECS #: 215-236-1

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Not combustible but enhances combustion of other substances. Many reactions may cause fire or explosion. Gives off irritating or toxic fumes (or gases) in a fire.    NO contact with water or combustible substances.    Use powder, carbon dioxide, dry sand. NO hydrous agents.   

 PREVENT DISPERSION OF DUST! AVOID ALL CONTACT! IN ALL CASES CONSULT A DOCTOR! 
  SYMPTOMS ACUTE HAZARDS FIRST AID
Inhalation Sore throat. Cough. Burning sensation. Shortness of breath. Symptoms may be delayed. See Notes.  Use local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention. 
Skin Pain. Blisters. Skin burns.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention . Wear protective gloves when administering first aid. 
Eyes Pain. Redness. Severe deep burns.  Wear face shield or eye protection in combination with breathing protection.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion Abdominal cramps. Burning sensation. Diarrhoea. Sore throat. Vomiting.  Do not eat, drink, or smoke during work.  Do NOT induce vomiting. Rest. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Personal protection: chemical protection suit including self-contained breathing apparatus. Sweep spilled substance into covered containers. Cautiously neutralize remainder with soda ash or calcium carbonate. Wash away remainder with plenty of water. 

According to UN GHS Criteria

 

Transportation
UN Classification
UN Hazard Class: 8; UN Pack Group: II 

STORAGE
Separated from combustible substances, reducing agents, strong oxidants, strong bases, water and food and feedstuffs. Dry. 
PACKAGING
Airtight.
Do not transport with food and feedstuffs. 
PHOSPHORUS PENTOXIDE ICSC: 0545
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
HYGROSCOPIC WHITE CRYSTALS OR POWDER. 

Physical dangers
 

Chemical dangers
The solution in water is a strong acid. It reacts violently with bases and is corrosive. Reacts violently with perchloric acid. This generates fire and explosion hazard. Reacts violently with water. This produces phosphoric acid. Attacks many metals in the presence of water. 

Formula: P2O5
Molecular mass: 141.9
Sublimation point: 360°C
Melting point: 340°C
Relative density (water = 1): 2.4
Solubility in water: reaction 


EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation of its aerosol and by ingestion. 

Effects of short-term exposure
The substance is very corrosive to the eyes, skin and respiratory tract. Corrosive on ingestion. Inhalation of dust may cause lung oedema. See Notes. The effects may be delayed. Medical observation is indicated. 

Inhalation risk
Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly when dispersed. 

Effects of long-term or repeated exposure
 


Occupational exposure limits
MAK: 2 (inhalable) mg/m3; peak limitation category: I(2); pregnancy risk group: C 

ENVIRONMENT
 

NOTES
Reacts violently with fire extinguishing agents such as water.
The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort.
Rest and medical observation is therefore essential.
Immediate administration of an appropriate inhalation therapy by a doctor or a person authorized by him/her, should be considered.
NEVER pour water into this substance; when dissolving or diluting always add it slowly to the water. 

ADDITIONAL INFORMATION
  EC Classification
Symbol: C; R: 35; S: (1/2)-22-26-45 

All rights reserved. The published material is being distributed without warranty of any kind, either expressed or implied. Neither ILO nor WHO nor the European Commission shall be responsible for the interpretation and use of the information contained in this material.
    See Also:
       Toxicological Abbreviations