Product Identification

Product Name

Diphosphoric acid

Synonyms

Diphosphoric acid
Pyrophosphate

CAS

2466-09-3

Formula

H4O7P2

Molecular Weight

177.98

EINECS

219-574-0

RTECS

JL6672500

RTECS Class

Other

Merck

12,8191

Beilstein/Gmelin

82619 (G)

Physical and Chemical Properties

Appearance

Odorless, hygroscopic syrupy liquid or a viscous off-white solid

Solubility in water

Very soluble

Melting Point

61

Density

1.75 g/cm3

pKa/pKb

0.99 (pKa)

First Aid Measures

Ingestion

If swallowed, wash out mouth with water provided person is conscious. Call a physician immediately.

Inhalation

If inhaled, remove to fresh air. If not breathing give artificial respiration. If breathing is difficult, give oxygen.

Skin

Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin.

Eyes

Assure adequate flushing of the eyes by separating the eyelids with fingers.

Handling and Storage

Storage

Keep tightly closed. Store in a cool dry place.

Hazards Identification

Inhalation

TOXIC; inhalation, ingestion, or skin contact with material may cause severe injury or death. Effects of contact or inhalation may be delayed.

Skin

Contact with molten substance may cause severe burns to skin and eyes. See Inhalation.

Eyes

See Inhalation.

Ingestion

See Inhalation.

Hazards

Emits toxic fumes under fire conditions.

EC Risk Phrase

34

EC Safety Phrase

26 36/37/39 45

UN (DOT)

3260

Exposure Controls/Personal Protection

Personal Protection

Wear appropriate government approved respirator, chemical-resistant gloves, safety goggles, other protective clothing. Faceshield (8-inch minimum).

Respirators

Wear positive pressure self-contained breathing apparatus (SCBA).

Exposure Effects

Corrosive. Causes burns.

Poison Class

2

Fire Fighting Measures

Fire Fighting

Extinguish using Dry chemical powder. Wear self-contained breathing apparatus and protective clothing to prevent contact with skin and eyes.

Fire Potential

Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.

Accidental Release Measures

Small spills/leaks

Cover with dry lime or soda ash, pick up, keep in a closed container, and hold for waste disposal. Ventilate area and wash spill site after material pickup is complete.

Stability and Reactivity

Incompatibilities

Strong bases, Strong oxidizing agents.

Decomposition

Thermal decomposition may produce toxic fumes of phosphorus oxides and/or phosphine.

Combustion Products

Fire may produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number

3260

Hazard Class

8

Packing Group

II