# NIOSH Pocket Guide to Chemical Hazards
Tetrasodium pyrophosphate | CAS 7722-88-5
Na4P2O7 | RTECS UX7350000
Synonyms & Trade Names Pyrophosphate, Sodium pyrophosphate, Tetrasodium diphosphate, Tetrasodium pyrophosphate (anhydrous), TSPP | DOT ID & Guide
Exposure Limits | NIOSH REL: TWA 5 mg/m3
OSHA PEL†: none
IDLH N.D. | Conversion
Physical Description Odorless, white powder or granules. [Note: The decahydrate (Na4P2O7 • 10H2O) is in the form of colorless, transparent crystals.]
MW: 265.9 | BP: Decomposes | MLT: 1810°F | Sol(77°F): 7%
VP: 0 mmHg (approx) | IP: NA |  | Sp.Gr: 2.45
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Solid
Incompatibilities & Reactivities Strong acids
Measurement Methods NIOSH 0500
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: Daily Provide: Eyewash (solution) | First Aid (See procedures) Eye: Irrigate immediately Skin: Water wash promptly Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations To be added later
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, nose, throat; dermatitis
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION