Colorless gas with a sweet odor.
Chain-transfer reagent in prodn of polybutadiene, fuel gas for metal-working industry (mixt with propyne), monomer for allene polymers (possible use).
Registry Numbers and Inventories.
S 9 16 33
Melting point, °C
Boiling point, °C
Vapor pressure, mmHg
5020 (25 C)
Vapor density (air=1)
1.787 g/cm3 (20 C)
Solubility in water
1.4168 (20 C)
Partition coefficient, pKow
Heat of vaporization
Heat of combustion
Hazards and Protection.
Store away from incompatible substances. Grounding and bonding is required. Avoid temperatures above room temperature.
Store and handle in accordance with all current regulations and standards. Subject to storage regulations: U.S. OSHA 29 CFR 1910.106. Keep separated from incompatible substances. Grounding and bonding required.
Wear appropriate chemical protective clothing.
Wear positive pressure self-contained breathing apparatus.
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors.
Unstable. Polymerizes easily.
May react vigorously with strong oxidizers Can react exothermically to release gaseous hydrogen Violent explosions have occurred at low temperatures in ammonia synthesis gas units.
Can decompose explosively at 2 atmospheres
Upper exp. limit, %
Lower exp. limit, %
Do not extinguish fire unless flow can be stopped. Use water in flooding quantities as fog. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
May polymerize explosively when heated or involved in a fire. Vapors from liquefied gas are initially heavier than air and spread along ground. Vapors may travel to source of ignition and flash back. Containers may explode when heated. Ruptured cylinders may rocket.
Fire may produce irritating and/or toxic gases.
The toxological properties of this substance have not been fully investigated.
Avoid contact with air and light.
May cause irritation.
May cause irritation.
Seek medical assistance.
Vapors may cause dizziness or asphyxiation without warning. May be toxic if inhaled at high concentrations.
Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
Flush with running water for at least 20 minutes.