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Boron oxide (Total dust)

General Description

  • Synonyms: Anhydrous boric acid; Boric anhydride; Boric oxide
  • OSHA IMIS Code Number: 0380
  • Chemical Abstracts Service (CAS) Registry Number: 1303-86-2
  • NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: ED7900000
  • Chemical Description and Physical Properties:
    • colorless, glassy granules or flakes with no odor
    • molecular weight: 70
    • vapor pressure: approx. 0 mm
    • boiling point: 4622°F
    • melting point: 842°F
  • Incompatibilities: None hazardous

Exposure Limits

  • OSHA Permissible Exposure Limit (PEL):
    • General Industry: 15 mg/m3
    • Construction Industry: 15 mg/m3 TWA
  • American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 10 mg/m3 TWA
  • National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 10 mg/m3 TWA

Health Factors

  • Potential Symptoms: Nasal irritation; conjunctivitis; erythema
  • Health Effects: Irritation-Eye, Nose, Throat, Skin---Mild (HE16)
  • Affected Organs: Skin, eyes

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):
  • Tared Low Ash Polyvinyl Chloride (PVC) filter 5 microns
  • maximum volume: 960 Liters
  • minimum volume: 480 Liters
  • maximum flow rate: 2.0 L/min
  • current analytical method: Gravimetric
  • method reference: 11, 12
  • sampling analytical error: 0.10
  • method classification: Fully Validated
Secondary Laboratory Sampling/Analytical Method (SAM2):
  • alternate analytical method: Inductively Coupled Argon Plasma; ICP/DCP-AES
  • method reference: 2 (OSHA ID-125G)
  • method classification: Not Validated
  • note: Submit as a separate sample only if the gross weight of the sample yields an air concentration greater than PEL. When the analysis of this compound is requested an analysis is performed for total Boron and reported as the compound.
Wipe Sampling Method:
  • Whatman smear tab;
  • analytical solvent: Deionized water

Soluble in boiling water and mineral acids

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