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Chemical Sampling Information (CSI)
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General Description

Synonyms: Dibromodifluoro-methane; Freon 12B2

OSHA IMIS Code Number: 0922

Chemical Abstracts Service (CAS) Registry Number: 75-61-6

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: PA7525000; 47878

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: 1941 58

NIOSH Pocket Guide to Chemical Hazards, Difluorodibromomethane: chemical description, physical properties, potentially hazardous incompatibilities, and more

Chemical Description and Physical Properties:

colorless liquid or gas with a characteristic odor
molecular weight: 210
vapor pressure: 620 mm
boiling point: 76°F
melting point: -233°F

Incompatibilities: Chemically active metals: sodium, potassium, calcium, powdered aluminum, zinc, magnesium

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

General Industry: 100 ppm, 860 mg/m3

Construction Industry: 100 ppm, 860 mg/m3 TWA

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 100 ppm, 858 mg/m3 TWA

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 100 ppm TWA

Health Factors

Potential Symptoms: In animals: respiratory system irritation; CNS symptoms; liver damage

Health Effects: Irritation-Eye, Nose, Throat, Skin---Mild (HE16) Cumulative liver damage (HE3) Narcosis (HE8)

Affected Organs: Respiratory system

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • sampling media: Two Charcoal Tubes (100/50 mg sections, 20/40 mesh) in series
    analytical solvent: Isopropanol
    maximum volume: 10 Liters   
    maximum flow rate:     0.2 L/min
    current analytical method: Gas Chromatography; GC/FID
    method reference: 1 (NIOSH 1012 [197 KB PDF, 4 pages])
    sampling and analytical error: 0.15
    method classification: Fully Validated

Secondary Laboratory Sampling/Analytical Method (SAM2):

  • part #: MIRAN 1A & 1B MIN. Det. Con.
    range: 0.04 ppm @ 9.2 um

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