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- Chemical Name
- Benzene
- Synonyms
- Benzol, Phenyl hydride
- CAS Registry Number
- 71-43-2
- RTECS Number
- CY1400000
| DOT/NAERG Numbers |
1114 130 |
| CCOHS Record Number |
49 |
| Molecular Formula |
C6H6 |
| Description Note |
[Note: A solid below 42°F.] |
- Description
- Colorless to light-yellow liquid with an aromatic odor.
- Note
- [Note: A solid below 42°F.]
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- Conversion Factor
- 1 ppm = 3.19 mg/m3
- NIOSH Recommended Exposure Limits (REL)
- NIOSH REL: Ca TWA 0.1 ppm ST 1 ppm See Appendix A
- OSHA Current Permissible Exposure Limits (PEL)
- OSHA PEL: [1910.1028] TWA 1 ppm ST 5 ppm See Appendix F
- IDLH Concentration
- Ca [500 ppm]
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- Recommendations For Respirator Selection
- NIOSH
At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode.
(APF = 10,000) Any supplied-air respirator that has a full-facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained breathing apparatus operated in pressure-demand or other positive-pressure mode.
Escape:
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister.
Any appropriate escape-type, self-contained breathing apparatus.
See Appendix E
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| PERSONAL PROTECTION AND SANITATION |
- Skin Protection
- Wear appropriate personal protective clothing to prevent skin contact.
- Eye Protection
- Wear appropriate eye protection to prevent eye contact.
- Skin Clean-up
- The worker should immediately wash the skin when it becomes contaminated.
- Clothing/PPE Removal
- Work clothing that becomes wet should be immediately removed due to its flammability hazard (i.e. for liquids with a flash point <100°F).
- Clothing/PPE Change
- No recommendation is made specifying the need for the worker to change clothing after the workshift.
- PPE Facilities
- Eyewash fountains should be provided in areas where there is any possibility that workers could be exposed to the substances; this is irrespective of the recommendation involving the wearing of eye protection. Facilities for quickly drenching the body should be provided within the immediate work area for emergency use where there is a possibility of exposure. [Note: It is intended that these facilities provide a sufficient quantity or flow of water to quickly remove the substance from any body areas likely to be exposed. The actual determination of what constitutes an adequate quick drench facility depends on the specific circumstances. In certain instances, a deluge shower should be readily available, whereas in others, the availability of water from a sink or hose could be considered adequate.]
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| HEALTH HAZARDS AND FIRST AID |
- Potential Routes of Exposure
- Inhalation, skin absorption, ingestion, skin and/or eye contact
- Potential Symptoms of Exposure
- Irritation eyes, skin, nose, respiratory/respiration system; dizziness; headache, nausea, staggered gait; anorexia, lassitude (weakness, exhaustion); dermatitis; bone marrow depressed/depression; potential occupational carcinogen
- Target Organs
- Eyes, skin, respiratory/respiration system, blood, central nervous system, bone marrow
- Potential Occupational Carcinogen
- [leukemia]
- Eyes - First Aid
- If this chemical contacts the eyes, immediately wash (irrigate) the eyes with large amounts of water, occasionally lifting the lower and upper lids. Get medical attention immediately.
- Skin - First Aid
- If this chemical contacts the skin, immediately wash the contaminated skin with soap and water. If this chemical penetrates the clothing, immediately remove the clothing, wash the skin with soap and water, and get medical attention promptly.
- Inhalation - First Aid
- If a person breathes large amounts of this chemical, move the exposed person to fresh air at once. If breathing has stopped, perform artificial respiration. Keep the affected person warm and at rest. Get medical attention as soon as possible.
- Ingestion - First Aid
- If this chemical has been swallowed, get medical attention immediately.
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| PHYSICAL AND CHEMICAL PROPERTIES |
| Molecular Weight |
MW: 78.1 |
| Boiling Point |
BP: 176°F |
| Freezing Point |
FRZ: 42°F |
| Solubility |
Sol: 0.07% |
| Vapor Pressure |
VP: 75 mmHg |
| Specific Gravity |
Sp.Gr: 0.88 |
| Flash Point |
Fl.P: 12°F |
| Lower Explosive Limit |
LEL: 1.2% |
| Upper Explosive Limit |
UEL: 7.8% |
| Ionization Potential |
IP: 9.24 eV |
- Flammability Class
- Class IB Flammable Liquid
- Incompatibilities and Reactivities
- Strong oxidizers, many fluorides & perchlorates, nitric acid
- Measurement Method
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- The NIOSH Pocket Guide is provided by US NIOSH and reflects the most recent printed edition dated February 3, 2009.
Please review the NIOSH Pocket Guide Supplement for important information about respiratory selection.
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©2010 Canadian Centre for Occupational Health & Safety 