What is an MSDS? Material Safety Data Sheet - MSDS Discuss that MSDS are sheets that contain very important information regarding the chemical. An MSDS is required for each chemical manufactured. It is the responsibility of the manufacturer or importer to provide an MSDS upon request. The employer in turn must make available copies of MSDSs for all chemicals found in the workplace. MSDSs are normally kept in a binder that is readily available in the employee's work area. The employer is also responsible for periodically maintaining the MSDS as the products change, are replaced or new products are purchased to replace existing items in the workplace.