The Home page of ILPI's Safety Data Sheet (SDS) Resource, the leader in SDS information since 1995!
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Hazardous
Definition
As defined by the 2012 version of OSHA Standard 29 CR 1910.1200 (the OSHA Haz-com standard, HCS 2012), a hazardous chemical is one which is a physical hazard or a health hazard.
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This resource focuses on Safety Data Sheets, but there are plenty of non-chemical hazards that OSHA also addresses. One of the most important, and one that overlaps with HCS 2012, is 29 CFR 1910.147, The Control of Hazardous Energy (Lockout/Tagout) Standard. The LOTO standard addresses seven types of hazardous energy and specifies the safety measures that employers must take to comply:
Mechanical - such as power transmission apparatus, counterbalances, springs, pressure, gravity etc.
Pneumatic - pressurized gases.
Hydraulic - pressurized liquid.
Electrical.
Chemical - includes flammable and combustible liquids; flammable gases. It also includes chemicals such as acids and bases that may thermally produce burn injury through high or low temperature.
Nuclear - typically X-ray equipment and isotopes.
Thermal - high or low temperature equipment/processes that could cause injury to employees.
The LOTO standard only considers danger present when energy may be released in quantities or at rates that could injure employees. In contrast, the HazCom Standard considers hazardous to be an intrinsic property of a material - e.g. if a material is hazardous, it is hazardous in any amount, no matter how small. See Hazard vs Risk, below.
Additional Info
Under paragraph (d)(1) of HCS 2012, "chemicalmanufacturers and importers shall evaluate chemicals produced in their workplaces or imported by them to classify the chemicals in accordance with this section. For each chemical, the chemical manufacturer or importer shall determine the hazard classes, and where appropriate, the category of each class that apply to the chemical being classified. Employers are not required to classify chemicals unless they choose not to rely on the classification performed by the chemical manufacturer or importer for the chemical to satisfy this requirement."
A hazard is an inherent (built-in) property of a material. Risk is the extent to which that material can cause harm. You can reduce or remove risks associated with a hazardous material, but you can not remove the underlying hazard itself (unless you get rid of the hazardous material, of course). For example, gasoline is hazardous, but it does not have a significant risk provided that proper use and storage precautions have been taken. See the last three links under Further Reading below for more information and discussion on this very fine (but very important) point.
Treatment under the now-obsolete 1994 version of the Hazard Communication Standard
Under the now-obsolete 1994 version of the HCS, "health hazard" was defined as a "chemical for which there is statistically significant evidence based on at least one study conducted in accordance with established scientific principles that acute or chronic health effects may occur in exposed employees. The term "health hazard" includes chemicals which are carcinogens, toxic or highly toxic agents, reproductive toxins, irritants, corrosives, sensitizers, hepatotoxins, nephrotoxins, neurotoxins, agents which act on the hematopoietic system, and agents which damage the lungs, skin, eyes, or mucous membranes. Appendix A provides further definitions and explanations of the scope of health hazards covered by this section, and Appendix B describes the criteria to be used to determine whether or not a chemical is to be considered hazardous for purposes of this standard."
Remember: SDS's are only required for materials that are hazardous. Often times, manufacturers are asked for SDS's for products that do not meet this requirement - manufacturers are under no obligation to produce SDS's for non-hazardous materials. Both we and OSHA discourage the production of SDS's for non-hazardous materials (listen up, corporate attorneys).
Substitution of hazardous chemicals at OECD includes a 2021 report Guidance on Key Considerations for the Identification and Selection of Safer Chemical Alternatives.
Disclaimer: The information contained herein is believed to be true and accurate, however ILPI makes no guarantees concerning the veracity of any statement. Use of any information on this page is at the reader's own risk. ILPI strongly encourages the reader to consult the appropriate local, state and federal agencies concerning the matters discussed herein.