Solid Carbonyl Chloride，another name of Triphosgene，has its chemistry term of Bis(tnchdomethyl) carbonate，abbreviated as BTC．The molecular for mula for Triphosgene is C3CL6O3 and molecular weight is 296.75． The appearance for Triphosgene is white crystal solid with 79—83C melting point and 203—206C (segmented decomposition)；Those with similar odor of carbonvl chloride；not decomposed in water but decomposed in organic solutions such as ether，tetrahydro furan，benzene，cyclohexane，chloroform etc..