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Searching for information on substances can be easier when you know the standard chemical formula, molecular weight, and classifying information. These are commonly used classification systems in toxicology:
From the U.S. Department of Labor Occupational Safety & Health Administration (OSHA), guidelines on the toxicity of metals. OSHA publishes a wide range of sources on toxicity as it relates to worker safety.
The Environmental Protection Agency's database on substances of interest to EPA and its state and tribal partners. References substances by the EPA Registry number as well as by other chemical classification systems.