Manufacturers may look up the chemicals and substances directly from the hazard list resources through the URLs provided here. A first step is to look up a chemical and its hazard information in a compilation database that is referenced in the appendix of the HPD Open Standard Instructions. This can be done easily by using the HPD Builder. Manufacturers may also use their own compilation database or an externally provided tool, such as the Pharos Project Chemical and Material Library. (Listings will be updated as other service providers offer HPD compliant hazard list compilations.)