For more than a century, the CRC Handbook of Chemistry and Physics has been a trusted source of reliable scientific data. It contains thousands of physical and chemical data tables which are reviewed and updated on an ongoing basis.
Volumes 1-3 are devoted to general techniques common to many industrial products. Volumes 4-19 cover analysis of specific materials. Volume 20 is the index to Volumes 4-19. Somewhat dated but still very useful.
Kirk-Other contains over one thousand in-depth articles on all aspects of chemical substances and technology, including properties, manufacturing, and uses. New and updated articles are added on an ongoing basis.