Melting point :−94 °C(lit.)
Boiling point :4 °C(lit.)
Density :1.73 g/mL at 0 °C(lit.)
vapor density :3.3 (20 °C, vs air)
vapor pressure :1420 mm Hg ( 20 °C)
form :cylinder (incl. valve, net weight ~2 g)
explosive limit :16%

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H280 Contains gas under pressure; may explode if heated Gases under pressure Compressed gas Liquefied gas Dissolved gas Warning P410+P403 H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362 H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning H341 Suspected of causing genetic defects Germ cell mutagenicity Category 2 Warning P201,P202, P281, P308+P313, P405,P501 H373 May cause damage to organs through prolonged or repeated exposure Specific target organ toxicity, repeated exposure Category 2 Warning P260, P314, P501 H400 Very toxic to aquatic life Hazardous to the aquatic environment, acute hazard Category 1 Warning P273, P391, P501 H420 Harms public health and the environment by destroying ozone in the upper atmosphere Hazardous to the ozone layer Category 1 Warning P502
Precautionary statements:	P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P273 Avoid release to the environment. P281 Use personal protective equipment as required. P301+P310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P311 Call a POISON CENTER or doctor/physician.