Safety Data Sheets (SDS), or Material Safety Data Sheets (MSDS), are guides to hazardous materials. These are often created and distributed by chemical manufacturers, distributors, or importers.
In 2012 the Occupational Safety & Health Administration required SDSs to be presented in a standardized 16 section format (you can see an example here). These sections include:
Below are some resources for finding MSDSs or SDSs. You can find similar property information in databases like SciFinder Scholar.