OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov.

January 18, 1995

The Honorable Daniel R. Inouye
United States Senate
Washington, D.C. 20510

Dear Senator Inouye:

This is in further response to your letter of September 29, on behalf of your constituent, Dr. Charles T. Campbell, concerning the Occupational Safety and Health Administration's (OSHA) Hazard Communication Standard (HCS). Dr. Campbell questioned the need for Material Safety Data Sheets (MSDSs), which are required to be developed and distributed under the HCS. Please accept my apology for the delay in this response.

Employers and employees need the information contained on MSDSs to protect themselves from hazardous chemical exposures and to work safely with chemical products. The result will be a reduction in chemical source illness and injuries in the workplace. Since the HCS became effective, the use and distribution of MSDSs have proven to be an effective and efficient way to ensure that employers and employees can obtain necessary information on the hazards associated with exposure to chemicals in the workplace.

MSDSs are specified by section 1910.1200(g) of the HCS (enclosed). The MSDS lists the hazardous ingredients of a product, its physical and chemical characteristics (e.g. flammability, explosive properties), its effect on human health, the chemicals with which it can adversely react, handling precautions, the types of measures that can be used to control exposure, emergency and first aid procedures, and methods to contain a spill. When new regulatory information, such as exposure limits, or new health effects information becomes available, the MSDS must be updated to reflect it.

It should also be noted that MSDSs are only required for hazardous chemicals and only to be sent with their initial shipment and with the first shipment after a MSDS is updated. In practice, MSDSs are prepared and provided for many products that are not covered by the HCS. It is our understanding that this is being done for product liability purposes, not for compliance with any Federal regulation. In fact, MSDSs were prepared and made available by many producers prior to implementation of regulatory requirements. In addition, many customers request MSDSs on all products, whether they are hazardous or not.

This practice has also encouraged producers to provide MSDSs for non-hazardous products. While OSHA does not require or encourage this practice, we certainly do not have the authority to prohibit producers from distributing such MSDSs.

We hope this information is helpful to you. Please feel free to contact [the Office of Health Enforcement at (202) 693-2190] if you have any additional questions.

Sincerely,



Joseph A. Dear
Assistant Secretary

[Corrected 12/6/2024]