Flash Point:flammable
Lower Limits:1.7%
Upper Limits:12.5%
Extinguishing Media:carbon dioxide, regular dry chemical Large fires:
Flood with fine water spray.
Fire Fighting Procedures:Move container from fire area if it can be
done without risk. Cool containers with water spray until well
after the fire is out. Stay away from the ends of tanks. For fires
in cargo or storage area: Cool containers with water from unmanned
hose holder or monitor nozzles until well after fire is out. If
this is impossible then take the following precautions: Keep
unnecessary people away, isolate hazard area and deny entry. Let
the fire burn. Withdraw immediately in case of rising sound from
venting safety device or any discoloration of tanks due to fire.
For tank, rail car or tank truck: Stop leak if possible without
personal risk. Let burn unless leak can be stopped immediately. For
smaller tanks or cylinders, extinguish and isolate from other
flammables. Evacuation radius: 800 meters (1/2 mile). Do not
attempt to extinguish fire unless flow of material can be stopped
first. Flood with fine water spray. Cool containers with water
spray until well after the fire i out. Apply water from a protected
location or from a safe distance. Avoid inhalation of material or
combustion by-products. Stay upwind and keep out of low areas.
Evacuate if fire gets out of control or containers are directly
exposed to fire. Evacuation radius: 500 meters (1/3 mile). Consider
downwind evacuation if material is leaking. Stop flow of gas.
Unusual Fire/Explosion Hazard:Severe fire hazard. Moderate explosion
hazard. Gas/air mixtures are explosive. The gas is heavier than
air. Vapors or gases may ignite at distant ignition sources and
flash back.

Spill Release Procedures:Avoid heat, flames, sparks and other sources
of ignition. Do not touch spilled material. Stop leak if possible
without personal risk. Reduce vapors with water spray. Keep
unnecessary people away, isolate hazard area and deny entry. Remove
sources of ignition. Ventilate closed spaces before entering.
Neutralizing Agent:

Handling and Storage Precautions:Store and handle in accordance with
all current regulations and standards. Subject to storage
regulations: U.S. OSHA 29 CFR 1910.101. Keep separated from
incompatible substances.
Other Precautions:

Respiratory Protection:The following respirators and maximum use
concentrations are drawn from NIOSH and/or OSHA. 1700 ppm Any
supplied-air respirator. Any self-contained breathing apparatus
with a full facepiece. Escape - Any air-purifying respirator with a
full facepiece and an organic vapor canister. Any appropriate
escape-type, self-contained breathing apparatus. For Unknown
Concentrations or Immediately Dangerous to Life or Health - Any
supplied-air respirator with full facepiece and operated in a
pressure-demand or other positive-pressure mode in combination with
a separate escape supply. Any self-contained breathing apparatus
with a full facepiece.
Ventilation:Provide local exhaust ventilation system. Ventilation
equipment should be explosion-resistant if explosive concentrations
of material are present. Ensure compliance with applicable exposure
limits.
Protective Gloves:Wear insulated gloves.
Eye Protection:Wear splash resistant safety goggles with a faceshield.
Provide an emergency eye wash fountain and quick drench shower in
the immediate work area.
Other Protective Equipment:For the gas: Protective clothing is not
required. For the liquid: Wear appropriate protective, cold
insulating clothing.
Supplemental Safety and Health
METHYL ACETYLENE: 1000 ppm (1650 mg/m3) OSHA TWA 1000 ppm ACGIH TWA
1000 ppm (1650 mg/m3) NIOSH recommended TWA 10 hour(s)

Boiling Pt:-9.8 F (-23.2 C)
Melt/Freeze Pt:-152.9 F (-102.7 C)
Vapor Pres:5 atm @ 19.5 C
Vapor Density:1.4
Spec Gravity:0.70 @ -50 C
pH:Not applicable
Evaporation Rate & Reference:Not applicable
Solubility in Water:slightly soluble
Appearance and Odor:PHYSICAL STATE:gas COLOR:colorless PHYSICAL
FORM:liquefied gas ODOR:sweet odor
Corrosion Rate:

Stability Indicator/Materials to Avoid:May decompose violently at room
temperature.
Stability Condition to Avoid:Avoid heat, flames, sparks and other
sources of ignition. Minimize contact with material. Containers may
rupture or explode if exposed to heat.
Hazardous Decomposition Products:Thermal decomposition products: oxides
of carbon Thermal decomposition products: oxides of carbon
Conditions to Avoid Polymerization:Will not polymerize.

Waste Disposal Methods:Dispose in accordance with all applicable
regulations. Subject to disposal regulations: U.S. EPA 40 CFR 262.
Hazardous Waste Number(s): D001.

Toxicological Information:METHYL ACETYLENE: TARGET ORGANS: central
nervous system MUTAGENIC DATA: Available.

Disclaimer (provided with this information by the compiling agencies):
This information is formulated for use by elements of the Department
of Defense. The United States of America in no manner whatsoever,
expressly or implied, warrants this information to be accurate and
disclaims all liability for its use. Any person utilizing this
document should seek competent professional advice to verify and
assume responsibility for the suitability of this information to their
particular situation.

Ecological:Not available

Transport Information:U.S. DOT 49 CFR 172.101: PROPER SHIPPING NAME:
Compressed gas, flammable, n.o.s. (methyl acetylene) ID NUMBER:
UN1954 HAZARD CLASS OR DIVISION: 2.1 LABELING REQUIREMENTS:
Flammable gas QUANTITY LIMITATIONS: PASSENGER AIRCRAFT OR RAILCAR:
Forbidden CARGO AIRCRAFT ONLY: 150 kg

SARA Title III Information: SARA TITLE III SECTION 302 EXTREMELY
HAZARDOUS SUBSTANCES (40 CFR 355.30): Not regulated. SARA TITLE
III SECTION 304 EXTREMELY HAZARDOUS SUBSTANCES (40 CFR 355.40): Not
regulated. SARA TITLE III SARA SECTIONS 311/312 HAZARDOUS
CATEGORIES (40 CFR 370.21): ACUTE: Yes CHRONIC: No FIRE: Yes
REACTIVE: Yes SUDDEN RELEASE: Yes SARA TITLE III SECTION 313 (40
CFR 372.65): Not regulated.
Federal Regulatory Information:CERCLA SECTIONS 102a/103 HAZARDOUS
SUBSTANCES (40 CFR 302.4): Not regulated. OSHA PROCESS SAFETY
(29CFR1910.119): Not regulated.
State Regulatory Information: California Proposition 65: Not regulated.