# NIOSH Pocket Guide to Chemical Hazards
Borates, tetra, sodium salts (Anhydrous) | CAS 1330-43-4
Na2B4O7 | RTECS ED4588000
Synonyms & Trade Names Anhydrous borax, Borax dehydrated, Disodium salt of boric acid, Disodium tetrabromate, Fused borax, Sodium borate (anhydrous), Sodium tetraborate | DOT ID & Guide
Exposure Limits | NIOSH REL: TWA 1 mg/m3
OSHA PEL†: none
IDLH N.D. | Conversion
Physical Description White to gray, odorless powder. [herbicide] [Note: Becomes opaque on exposure to air.]
MW: 201.2 | BP: 2867°F (Decomposes) | MLT: 1366°F | Sol: 4%
VP: 0 mmHg (approx) | IP: NA |  | Sp.Gr: 2.37
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Solid
Incompatibilities & Reactivities Moisture [Note: Forms partial hydrate in moist air.]
Measurement Methods NIOSH 0500; OSHA ID125G
Personal Protection & Sanitation Skin: No recommendation Eyes: No recommendation Wash skin: Daily Remove: No recommendation Change: Daily | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash 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, upper respiratory system; dermatitis; epistaxis (nosebleed); cough, dyspnea (breathing difficulty)
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION