The hazard communication standard (HCS) requires chemical manufacturers, distributors, or importers to provide safety data sheets (SDSs) (formerly known as Material Safety Data Sheets or MSDSs) for each hazardous chemical they produce or import to communicate the hazards of hazardous chemical products. The requirements on the safety data sheet (SDS) include a uniform format and specific section numbers, headings, and associated information. See the hazard communication page for more information.