The following Hazard Statement Codes are for Environmental Hazards: Code C: h400, Environmental Hazard Statement EHS: Very toxic to aquatic life, Hazard Class (GHS Chapter) H Class: Hazardous to the aquatic environment, acute toxicity(chapter 4.1), Hazard Category H Cat: 1; C: h401, EHS: Toxic to aquatic life, H Class: Hazardous to the aquatic environment, acute toxicity(chapter 4.1), H Cat: 2; C: h402, EHS: Harmful to aquatic life, H Class: Hazardous to the aquatic environment, acute toxicity (chapter 4.1), H Cat: 3; C: h410, EHS: Very toxic to aquatic life with long lasting effects, H Class: Hazardous to the aquatic environment, chronic toxicity(chapter 4.1), H Cat: 1; C: h411, EHS: Toxic to aquatic life with long lasting effects, H Class: Hazardous to the aquatic environment, chronic toxicity(chapter 4.1), H Cat: 2; C: h412, EHS: Harmful to aquatic life with long lasting effects, H Class: Hazardous to the aquatic environment, chronic toxicity(chapter 4.1), H Cat: 3; C: h413, EHS: May cause long lasting harmful effects to aquatic life, H Class: Hazardous to the aquatic environment, chronic toxicity(chapter 4.1), H Cat: 4. MSDS Relevance: H-statements are not currently required on labels or MSDS's by U.S. OSHA, however, this will eventually change as the US moves towards using the Globally Harmonized System of Classification and Labeling of Chemicals (GHS). In the European Community, H-statements are being phased in and will replace risk phrases which are already required by law. You should expect to start seeing H-statements on your MSDS's and labels over the next few years. Remember that H-statements phrases indicate only the hazards of a material, not the safety precautions that you need to follow. For safety information See: The Precaution Statements entry. See also: ANSI, CHIP, EINECS, Precautionary Statements, risk phrases, UN/NA Numbers, and the International Section of the MSDS FAQ.