|CAS Number||UN/NA Number|
|DOT Hazard Label||USCG CHRIS Code|
|NIOSH Pocket Guide||International Chem Safety Card|
- Strong Oxidizing Agent
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. For electric vehicles or equipment, ERG Guide 147 (lithium ion batteries) or ERG Guide 138 (sodium batteries) should also be consulted. (ERG, 2016)
TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution. (ERG, 2016)
Use caution: Liquids with this reactive group classification have been known to react with the absorbents listed below. More info about absorbents, including situations to watch out for...
- Cellulose-Based Absorbents
- Expanded Polymeric Absorbents
As an immediate precautionary measure, isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids.
SPILL: Increase, in the downwind direction, as necessary, the isolation distance shown above.
FIRE: If tank, rail car or tank truck is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. (ERG, 2016)
SMALL FIRE: Dry chemical, CO2 or water spray.
LARGE FIRE: Dry chemical, CO2, alcohol-resistant foam or water spray. Move containers from fire area if you can do it without risk. Dike fire-control water for later disposal; do not scatter the material.
FIRE INVOLVING TANKS OR CAR/TRAILER LOADS: Fight fire from maximum distance or use unmanned hose holders or monitor nozzles. Do not get water inside containers. Cool containers with flooding quantities of water until well after fire is out. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. ALWAYS stay away from tanks engulfed in fire. (ERG, 2016)
ELIMINATE all ignition sources (no smoking, flares, sparks or flames in immediate area). Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Prevent entry into waterways, sewers, basements or confined areas. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS. (ERG, 2016)
Eyes: Wear appropriate eye protection to prevent eye contact.
Wash skin: The worker should immediately wash the skin when it becomes contaminated.
Remove: Work clothing that becomes wet or significantly contaminated should be removed and replaced.
Change: Workers whose clothing may have become contaminated should change into uncontaminated clothing before leaving the work premise.
Provide: Eyewash fountains should be provided in areas where there is any possibility that workers could be exposed to the substance; this is irrespective of the recommendation involving the wearing of eye protection. (NIOSH, 2016)
Skin: 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.
Breathing: If a person breathes large amounts of this chemical, move the exposed person to fresh air at once. If breathing has stopped, perform mouth-to-mouth resuscitation. Keep the affected person warm and at rest. Get medical attention as soon as possible.
Swallow: If this chemical has been swallowed, get medical attention immediately. (NIOSH, 2016)
AEGLs (Acute Exposure Guideline Levels)
|10 minutes||NR||0.015 ppm||5 ppm|
|30 minutes||NR||0.011 ppm||5 ppm|
|60 minutes||NR||0.0084 ppm||4 ppm|
|4 hours||NR||0.0033 ppm||2.5 ppm|
|8 hours||NR||0.0017 ppm||2 ppm|
ERPGs (Emergency Response Planning Guidelines)No ERPG information available.
PACs (Protective Action Criteria)
|Osmium tetroxide (20816-12-0)||0.0006 ppm||0.0084 ppm||4 ppm|
EPA Consolidated List of Lists
|Regulatory Name||CAS Number/
313 Category Code
|CERCLA RQ||EPCRA 313
|Osmium oxide OsO4 (T-4)-||20816-12-0||1000 pounds||X||P087|
|Osmium tetroxide||20816-12-0||1000 pounds||313||P087|
- "X" indicates that this is a second name for an EPCRA section 313 chemical already included on this consolidated list. May also indicate that the same chemical with the same CAS number appears on another list with a different chemical name.
(EPA List of Lists, 2015)
DHS Chemical Facility Anti-Terrorism Standards (CFATS)No regulatory information available.
OSHA Process Safety Management (PSM) Standard List
|Chemical Name||CAS Number||Threshold Quantity (TQ)|
|Osmium Tetroxide||20816-12-0||100 pounds|
- MILAS' REAGENT
- OSMIC ACID ANHYDRIDE
- OSMIUM OXIDE
- OSMIUM OXIDE (OSO4)
- OSMIUM OXIDE OSO4 (T-4)-
- OSMIUM TETRAOXIDE
- OSMIUM TETROXIDE
- OSMIUM(IV) OXIDE
- REAGENTS, MILAS'
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