CAS No.:821-10-3

TOXICITY DATA with REFERENCE：

1.

ivn-mus LD50:56 mg/kg

CSLNX*    U.S. Army Armament Research & Development Command, Chemical Systems Laboratory, NIOSH Exchange Chemicals. (Aberdeen Proving Ground, MD 21010) NX#02969 .

Carcinogenicity:1,4-Dichloro-2-butyne(821-10-3)- Not listed as a carcinogen by  NTP, IARC,ACGIH, or CA Prop 65. 
Other: The toxicological properties have not been fully investigated.See actual entry in RTECS for complete information.
Consensus Reports：Reported in EPA TSCA Inventory.
SAFETY PROFILE：
Poison by intravenous route. When heated to decomposition it emits toxic fumes of Cl⁻. Probably a dangerous fire and explosion hazard.See also ACETYLENE COMPOUNDS and ALKYNES and CHLORINATED HYDROCARBONS, ALIPHATIC.
Hazard Codes:Xi,T
Risk Statements:
23:  Toxic by inhalation
24:  Toxic in contact with skin
25:  Toxic if swallowed
36:  Irritating to the eyes
37:  Irritating to the respiratory system
38:  Irritating to the skin
39:  Danger of very serious irreversible effects
40:  Limited evidence of a carcinogenic effect
Safety Statements:
26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
28:  After contact with skin, wash immediately with plenty of ... (to be specified by the manufacturer) 
36:  Wear suitable protective clothing 
37:  Wear suitable gloves
38:  In case of insufficient ventilation, wear suitable respiratory equipment
39:  Wear eye/face protection
45:  In case of accident or if you feel unwell, seek medical advice immediately (show label where possible)