**** SECTION 2 - COMPOSITION, INFORMATION ON INGREDIENTS ****
+----------------+--------------------------------------+----------+-----------+
| CAS# | Chemical Name | % | EINECS# |
|----------------|--------------------------------------|----------|-----------|
| 74-93-1 |Methyl Mercaptan | >99.5 | 200-822-1 |
+----------------+--------------------------------------+----------+-----------+
Hazard Symbols: XN F+
Risk Phrases: 12 20
**** SECTION 3 - HAZARDS IDENTIFICATION ****
EMERGENCY OVERVIEW
Extremely flammable. Harmful by inhalation.
Potential Health Effects
Eye:
Causes eye irritation.
Skin:
Causes skin irritation. May be absorbed through the skin.
Ingestion:
Causes gastrointestinal irritation with nausea, vomiting and
diarrhea. May cause liver and kidney damage. May cause central
nervous system depression. Mercaptans may cause nausea and headache.
Exposure to high concentrations of mercaptans can produce
unconsciousness with cyanosis (bluish discoloration of skin due to
deficient oxygenation of the blood), cold extremities and rapid
pulse.
Inhalation:
Causes respiratory tract irritation. May cause liver and kidney
damage. Exposure produces central nervous system depression. Vapors
may cause dizziness or suffocation. Exposure may lead to delirium,
convulsions, paralysis, and coma. Exposure to high concentrations of
mercaptans can produce unconsciousness with cyanosis (bluish
discoloration of skin due to deficient oxygenation of the blood),
cold extremities and rapid pulse. Mercaptans may cause nausea and
headache. Harmful if inhaled.
Chronic:
May cause liver and kidney damage. Exposure to large doses may cause
central nervous system depression.
**** SECTION 4 - FIRST AID MEASURES ****
Eyes:
Flush eyes with plenty of water for at least 15 minutes,
occasionally lifting the upper and lower eyelids. Get medical aid
immediately. Do NOT allow victim to rub eyes or keep eyes closed.
Skin:
Get medical aid. Flush skin with plenty of water for at least 15
minutes while removing contaminated clothing and shoes. Wash clothing
before reuse.
Ingestion:
Do not induce vomiting. If victim is conscious and alert, give 2-4
cupfuls of milk or water. Never give anything by mouth to an
unconscious person. Get medical aid immediately.
Inhalation:
Get medical aid immediately. Remove from exposure and move to fresh
air immediately. If breathing is difficult, give oxygen. Do NOT use
mouth-to-mouth resuscitation. If breathing has ceased apply
artificial respiration using oxygen and a suitable mechanical device
such as a bag and a mask.
Notes to Physician:
**** SECTION 5 - FIRE FIGHTING MEASURES ****
General Information:
As in any fire, wear a self-contained breathing apparatus in
pressure-demand, MSHA/NIOSH (approved or equivalent), and full
protective gear. Vapors may form an explosive mixture with air.
Vapors can travel to a source of ignition and flash back. During a
fire, irritating and highly toxic gases may be generated by thermal
decomposition or combustion. Use water spray to keep fire-exposed
containers cool. Extremely flammable liquid and vapor. Containers may
explode in the heat of a fire. Will be easily ignited by heat, sparks
or flame.
Extinguishing Media:
For small fires, use dry chemical, carbon dioxide, water spray or
alcohol-resistant foam. For large fires, use water spray, fog, or
alcohol-resistant foam. Use water spray to cool fire-exposed
containers. Water may be ineffective. Use agent most appropriate to
extinguish fire. Do NOT use straight streams of water.
**** SECTION 6 - ACCIDENTAL RELEASE MEASURES ****
General Information: Use proper personal protective equipment as indicated
in Section 8.
Spills/Leaks:
Absorb spill with inert material (e.g. vermiculite, sand or earth),
then place in suitable container. Avoid runoff into storm sewers and
ditches which lead to waterways. Clean up spills immediately,
observing precautions in the Protective Equipment section. Remove all
sources of ignition. Use a spark-proof tool. A vapor suppressing foam
may be used to reduce vapors. Rinse area for 10 minutes with a strong
Sodium Hypochorite (bleach) solution, then reabsorb material.
**** SECTION 7 - HANDLING and STORAGE ****
Handling:
Wash thoroughly after handling. Remove contaminated clothing and
wash before reuse. Ground and bond containers when transferring
material. Avoid contact with eyes, skin, and clothing. Empty
containers retain product residue, (liquid and/or vapor), and can be
dangerous. Keep away from heat, sparks and flame. Avoid ingestion and
inhalation. Do not pressurize, cut, weld, braze, solder, drill,
grind, or expose empty containers to heat, sparks or open flames.
Storage:
Keep away from heat, sparks, and flame. Keep away from sources of
ignition. Store in a cool, dry place. Keep container closed when not
in use. Flammables-area.
**** SECTION 8 - EXPOSURE CONTROLS, PERSONAL PROTECTION ****
Engineering Controls:
Facilities storing or utilizing this material should be equipped
with an eyewash facility and a safety shower. Use process enclosure,
local exhaust ventilation, or other engineering controls to control
airborne levels.
Exposure Limits
CAS# 74-93-1:
United Kingdom, WEL - TWA: 0.5 ppm TWA; 1.0 mg/m3 TWA
United Kingdom, WEL - STEL: 1.5 ppm STEL; 3.0 mg/m3 STEL
United States OSHA: ; 10 ppm Ceiling; 20 mg/m3 Ceiling
Belgium - TWA: 0.5 ppm VLE; 0.99 mg/m3 VLE
France - VME: 0.5 ppm VME; 1 mg/m3 VME
Germany: 0.5 ppm TWA; 1 mg/m3 TWA
Malaysia: 0.5 ppm TWA; 0.98 mg/m3 TWA
Netherlands: 0.5 ppm MAC; 1 mg/m3 MAC
Russia: 0.8 mg/m3 TWA
Spain: 0.5 ppm VLA-ED; 1 mg/m3 VLA-ED
Personal Protective Equipment
Eyes:
Wear chemical splash goggles. Wear appropriate
protective eyeglasses or chemical safety goggles as
described by OSHA's eye and face protection
regulations in 29 CFR 1910.133 or European Standard
EN166.
Skin:
Wear appropriate protective gloves to prevent skin
exposure.
Clothing:
Wear appropriate protective clothing to minimize
contact with skin.
Respirators:
A respiratory protection program that meets OSHA's 29
CFR 1910.134 and ANSI Z88.2 requirements or European
Standard EN 149 must be followed whenever workplace
conditions warrant respirator use.
**** SECTION 9 - PHYSICAL AND CHEMICAL PROPERTIES ****
Physical State: Liquid
Color: water-white - colorless
Odor: garlic-like odor - unpleasant odor
pH: Not available.
Vapor Pressure: 1520 mm Hg @ 26C
Viscosity: Not available.
Boiling Point: 5.95 deg C
Freezing/Melting Point: -123 deg C
Autoignition Temperature: Not available.
Flash Point: >-18 deg C
Explosion Limits, lower: 3.9
Explosion Limits, upper: 21.0
Decomposition Temperature:
Solubility in water: Slightly soluble.
Specific Gravity/Density: .9000g/cm3
Molecular Formula: CH4S
Molecular Weight: 48.11
**** SECTION 10 - STABILITY AND REACTIVITY ****
Chemical Stability:
Stable under normal temperatures and pressures.
Conditions to Avoid:
Incompatible materials, ignition sources, excess heat, strong
oxidants.
Incompatibilities with Other Materials:
Strong oxidizing agents, strong reducing agents, strong acids, strong
bases, copper, copper alloys, halogenated agents, hydrazine, organic
peroxides, zinc, ketones (e.g. acetone, acetophenone, MEK, MIBK),
epoxides (e.g. butyl glycidyl ether), lead, moisture, organic
materials.
Hazardous Decomposition Products:
Irritating and toxic fumes and gases, sulfur oxides (SOx), including
sulfur oxide and sulfur dioxide.
Hazardous Polymerization: Has not been reported
**** SECTION 11 - TOXICOLOGICAL INFORMATION ****
RTECS#:
CAS# 74-93-1: PB4375000
LD50/LC50:
CAS# 74-93-1: Inhalation, mouse: LC50 = 6530 ug/m3/2H; Inhalation,
rat: LC50 = 675 ppm.
Inhalation, rat:
Carcinogenicity:
Methyl Mercaptan -
Not listed by ACGIH, IARC, or NTP.
Other:
See actual entry in RTECS for complete information.
**** SECTION 12 - ECOLOGICAL INFORMATION ****
Other
No information available.
**** SECTION 13 - DISPOSAL CONSIDERATIONS ****
Dispose of in a manner consistent with federal, state, and local regulations.
**** SECTION 14 - TRANSPORT INFORMATION ****
IATA
Not regulated as a hazardous material.
IMO
Not regulated as a hazardous material.
RID/ADR
Not regulated as a hazardous material.
USA RQ: CAS# 74-93-1: 100 lb final RQ; 45.4 kg final RQ
**** SECTION 15 - REGULATORY INFORMATION ****
European/International Regulations
European Labeling in Accordance with EC Directives
Hazard Symbols: XN F+
Risk Phrases:
R 12 Extremely flammable.
R 20 Harmful by inhalation.
Safety Phrases:
S 16 Keep away from sources of ignition - No
smoking.
S 25 Avoid contact with eyes.
WGK (Water Danger/Protection)
CAS# 74-93-1: 3
Canada
CAS# 74-93-1 is listed on Canada's DSL List.
CAS# 74-93-1 is listed on Canada's Ingredient Disclosure List.
US FEDERAL
TSCA
CAS# 74-93-1 is listed on the TSCA inventory.
**** SECTION 16 - ADDITIONAL INFORMATION ****
MSDS Creation Date: 4/08/1999 Revision #3 Date: 6/20/2002
The information above is believed to be accurate and represents the best
information currently available to us. However, we make no warranty of
merchantability or any other warranty, express or implied, with respect to
such information, and we assume no liability resulting from its use. Users
should make their own investigations to determine the suitability of the
information for their particular purposes. In no way shall the company be
liable for any claims, losses, or damages of any third party or for lost
profits or any special, indirect, incidental, consequential or exemplary
damages, howsoever arising, even if the company has been advised of
the possibility of such damages.
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