tetrachloride

The agency moved to ban asbestos last year and has also proposed banning methylene chloride, perchloroethylene and carbon tetrachloride.

It also started a production line for optical fiber ultra-high purity germanium tetrachloride, with annual output of 30 metric tons.

They will also apply to six germanium products: germanium dioxide, germanium epitaxial growth substrate, germanium ingot, germanium metal, germanium tetrachloride and zinc germanium phosphide.

That includes the likely next up, perchloroethylene, a solvent used for cleaning and degreasing, and carbon tetrachloride, another solvent that is commonly used to produce other chemicals such as refrigerants.

The munition, which combined powdered zinc and carbon tetrachloride to generate opaque clouds of molten zinc chloride smoke, was intended to obscure troop movements, not for crowd control.