Product Identification

Product Name

Disodium pytophosphate

Synonyms

Disodium (hydroxy-oxidophosphoryl) hydrogen phosphate
Disodium diphosphate
SAPP
Sodium acid pyrophosphate

CAS

7758-16-9

Formula

H2Na2O7P2

Molecular Weight

221.94

EINECS

231-835-0

RTECS

UX6475000

RTECS Class

Other

Merck

12,8713

Beilstein/Gmelin

44986 (G)

Physical and Chemical Properties

Appearance

White odorless powder

Solubility in water

120 g/L

Density

2.311 g/cm3 (25 C)

Usage

Electroplating, metal cleaning and phosphatising, drilling muds, baking powders and leavening agent, buffer, sequestrant, peptising agent in cheese and meat products, frozen desserts.

First Aid Measures

Ingestion

Seek medical attention. If individual is drowsy or unconscious, do not give anything by mouth; place individual on the left side with the head down. Contact a physician, medical facility, or poison control center for advice about whether to induce vomiting. If possible, do not leave individual unattended.

Inhalation

If symptoms develop, move individual away from exposure and into fresh air. If symptoms persist, seek medical attention. If breathing is difficult, administer oxygen. Keep person warm and quiet; seek immediate medical attention.

Skin

Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.

Eyes

Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Handling and Storage

Storage

Store in a cool, dry location in a tightly sealed container.

Handling

Containers of this material may be hazardous when emptied. Since emptied containers retain product residues (vapor, liquid, and/or solid), all hazard precautions given in the data sheet must be observed.

Hazards Identification

Inhalation

Hyperventilation may occur secondary to hypocalcemia.

Skin

May cause mild skin irritation. Symptoms may include redness and burning of skin.

Eyes

Can cause eye irritation. Symptoms include stinging, tearing, redness, and swelling of eyes.

Ingestion

Nausea, vomiting, abdominal pain, and diarrhea are common, leading to dehydration.

Exposure Controls/Personal Protection

Personal Protection

Wear safety glasses in compliance with OSHA regulations. Wear resistant gloves such as neoprene. Wear normal work clothing covering arms and legs.

Respirators

If needed, use a NIOSH/MSHA jointly approved dust respirator.

Exposure Effects

Signs and symptoms of exposure to this material through breathing, swallowing, and/or passage of the material through the skin may include: stomach or intestinal upset (nausea, vomiting, diarrhea)

Fire Fighting Measures

Fire Fighting

Wear a self-contained breathing apparatus with a full facepiece operated in the positive pressure demand mode with appropriate turn-out gear and chemical resistant personal protective equipment. Extinguish fire using most appropriate media.

Accidental Release Measures

Small spills/leaks

Small Spill - Sweep up material for disposal or recovery. Large Spill - Shovel material into containers. Thoroughly sweep area of spill to clean up any residual material.

Stability and Reactivity

Stability

Stable at normal temperatures and pressures.

Incompatibilities

Strong mineral acids.

Decomposition

Phosphorous compounds.

Combustion Products

Phosphorous compounds.