The hazard communication standard (HCS) requires employers to provide information about chemical hazards in products used on the job site. Safety data sheets (SDS) must be provided for all hazardous chemicals and must be available to workers. SDS sheets list hazard classifications, first aid measures, exposure control procedures, storage requirements, and disposal information. Labels on chemical containers must identify the chemical and display hazard warnings. Pictograms and signal words communicate hazard severity. All workers must be trained on recognizing hazardous materials and using appropriate controls. Training must cover the meaning of labels and SDS sheets. Exposure limits established by OSHA must not be exceeded through inhalation. Engineering controls such as ventilation must be used first. Personal protective equipment provides supplementary protection. Chemical incompatibilities must be considered when storing materials. Some chemicals cannot be stored together as they may react if containers leak or break. Hazardous waste disposal must follow EPA regulations. Spill response procedures must be in place with proper cleanup materials and trained personnel. Reporting of chemical exposures or spills must be documented.