R 336.204 Register of materials.

Rule 4. The register of materials reads as follows: Register of materials Group A Group C Asbestos Sulfur dioxide Benzo-a-pyrene Beryllium or its compounds Bromine Group D Chrlorine Cyanides Alcohols Flourides Ethers Flourine Esthers Iodine Ketones Lead or its compounds Halogenated hydrocarbons Mercaptans Non-methane hydrocarbons Mercury or its compounds Pesticides Sulfides, organic and inorganic Group B Particulate (except those listed in group A) Group E Oxides of nitrogen Carbon monoxide Ammonia