... 7Standard:GB10666-2004Appearance: Grey, yellowish-brown ,black or brown solid blockSize:2-4mm,4-7mm,7-15mm,15-25mm,25 ... :SGS or any other agency as per your requirementDescription:calcium carbide is a grayshi-black crystalline compound obtained by ... other materials,the combination can produce acetylene,chloroprene rubber,calcium cyanamide,acetate acid,trichloroethylene,and acetaldehyde.Moreover,it can ...