NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

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. See: IDLH INDEX
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
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
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
Not available.
Important additional information about respirator selection
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   See ICSC CARD: 1229