Final answer:
The Manufacturer or supplier is responsible for preparing the MSDS for a hazardous substance. The NFPA hazard diamond included in an MSDS summarizes the major hazards, while OSHA provides guidelines but does not create the MSDS.
Step-by-step explanation:
The Manufacturer or supplier usually prepares the Material Safety Data Sheet (MSDS) of a hazardous substance. Manufacturers have the responsibility to provide MSDSs that communicate information on the potential hazards associated with their chemicals. The National Fire Protection Agency (NFPA) hazard diamond is a tool included in an MSDS that summarizes a chemical's major hazards helping in the risk assessment and safety management of hazardous materials.
The Occupational Safety and Health Administration (OSHA) provides guidelines and maintains a list of highly hazardous chemicals, but it is not responsible for creating individual MSDSs for substances. This information is critical for ensuring the safety of those who must handle or are exposed to hazardous substances in the workplace.