BORIC ACID

Chemical Identification
Chemical Identification
CAS # 10043-35-3
Formula

BH₃O₃

Synonyms

Basilit B; boracic acid; borofax; boron trihydroxide; orthoboric acid; trihydroxyborone

Physical Properties
Physical Properties
Physical description Odorless white solid.
Boiling point 572°F Molecular weight 61.83
Freezing point/melting point 340°F Vapor pressure
Flash point Vapor density
Specific gravity 1.435 Ionization potential
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating NFPA fire rating
NFPA reactivity rating NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) B141 (total); request using analyte code 9135
Sampling group
Sampler/Sampling media Tared low-ash 37 mm PVC filter, 5 microns [SLTC108]
Sampling time*

240-480 min

Sampling volume (TWA)*

960 L

Sampling flow rate (TWA)*

2 L/min

Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments Gravimetric
Method reference OSHA PV2121 (partially validated)
Notes

If the net weight of the sample yields a concentration below the PEL after considering the associated SAE , the SLTC will perform no further work on the sample and the sample air concentration will be reported as the calculated gravimetric air concentration.

If the net weight corresponds to an amount greater than the PEL value after considering the associated SAE, the sample may be analyzed for  the applicable component and appropriate results will be reported.

Special requirements

FOR TOTAL DUST SAMPLES, DO NOT USE A CYCLONE!!!

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Wipe Method
Wipe Method
Sampler/Sampling media
Bulk Method
Bulk Method
On-Site Screening Techniques
On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
Exposure Limits
Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA REL-TWA TLV-TWA

2 mg/m³ (inhalable particulate matter) [2004]

PEL-TWA
PEL-STEL REL-STEL TLV-STEL

6 mg/m³ (inhalable particulate matter) [2004]

PEL-STEL
PEL-C REL-C TLV-C PEL-C
Skin notation

NA

Skin notation

NA

Skin notation

N

Skin notation

NA

Notes:

Not established

Notes:

Not established

Notes: Notes:

Not established

Health factors:  See NIH-NLM PubChem. IDLH
Carcinogenic classifications: TLV-A4 Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Boric Acid

NIOSH: Pocket Guide to Chemical Hazards - Not Listed

Literature References

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Borate compounds, inorganic. See annual publication for most recent information.
  • California Department of Health Services-Drinking Water Program: Drinking Water Notification Levels, 2005.
  • U.S. EPA Integrated Risk Information System: Toxicological Review of Boron and Compounds (CAS 7440-42-8), 2004 (EPA 635/04/052).
  • Chapin, R.E., et al.: The effects of dietary boron on bone strength in rats. Fundam. Appl. Toxicol. 35(2): 205-215, 1997.
  • Garabrant, D.H., Bernstein, L., Peters, J.M. and Smith, T.J.: Respiratory and eye irritation from boron oxide and boric acid dusts. J. Occup. Med. 26(8): 584-586, 1984.
  • Ku, W.W. and Chapin, R.E.: Mechanism of the testicular toxicity of boric acid in rats: in vivo and in vitro studies. Environ. Health Perspect. 102(Suppl. 7): 99-105, 1994.
  • Moore, J.A., et al.: An assessment of boric acid and borax using the IEHR evaluative process for assessing human developmental and reproductive toxicity of agents. Reprod. Toxicol. 11(1): 123-160, 1997.
  • Pahl, M.V., Culver, B.D. and Vaziri, N.D.: Boron and the kidney. J. Ren. Nutr. 15(4): 362-370, 2005.
  • Park, M., Li, Q., Shcheynikov, N., Zeng, W. and Muallem, S.: NaBC1 is a ubiquitous electrogenic Na+-coupled borate transporter essential for cellular boron homeostasis and cell growth and proliferation. Mol. Cell 16(3): 331-341, 2004.
  • Pohanish, R.P. (editor): Boron, Boric Acid and Borax. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 1. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 355-357.

Last Updated Date : 12/18/2020