An ICSC summarizes essential health and safety information on chemicals for their use at the "shop floor" level by workers and employers in factories, agriculture, construction and other work places.
http://www.ilo.org/public/english/protection/safework/cis/products/icsc/dtasht/index.htm

HSDB (Hazardous Substances Data Bank) is a scientifically reviewed, factual database containing records for about 4500 toxic chemicals. It contains extensive information in areas as toxicity, environmental fate, human exposure, chemical safety, waste disposal, emergency handling, and regulatory requirements.
https://toxnet.nlm.nih.gov/cgi-bin/sis/htmlgen?HSDB

Toxic concentrations of chemicals.
https://www.cdc.gov/niosh/idlh/intridl4.html

Material Safety Data Sheets (MSDS), regulated under Workplace Hazardous Materials Information System (WHMIS) legislation, for chemical products have been available to workers for many years. However because many laboratory workers, whether in research, public health, teaching, etc., are exposed to not only chemicals but infectious substances as well, there was a large gap in the readily available safety literature for employees. These MSDS are produced for personnel working in the life sciences as quick safety reference material relating to infectious micro-organisms.
http://www.phac-aspc.gc.ca/msds-ftss/index.html

Nuclide Safety Data Sheets provided by the North Carolina State University.
http://www.hpschapters.org/northcarolina/nsds.php3

The Occupational Safety and Health Review Commission (OSHRC) is an independent Federal agency created to decide contests of citations or penalties resulting from OSHA inspections of American work places.
http://www.oshrc.gov/index.html

Pesticide Fact Sheets - NPIC fact sheets are designed to answer questions that are commonly asked by the general public about pesticides and pesticide related topics. These documents are intended to be educational in nature and helpful to consumers making decisions about pesticide use.
http://npic.orst.edu/npicfact.htm?IRIS

Extensive array of references to literature on biochemical, pharmacological, physiological, and toxicological effects of drugs and other chemicals.
https://toxnet.nlm.nih.gov/newtoxnet/toxline.htm

TOXNET is a cluster of databases on toxicology, hazardous chemicals, and related areas. Provided by the NLM, National Library of Medicine: