Purdue has access to Perry's on two different ebook platforms. Depending on your preference, you can use either. Both sites contain the contents of the entire 8th edition.
Knovel has e-books in Chemistry and Chemical Engineering, including Plant Design and Operation and data on many chemical properties of compounds. Knovel also contains interactive graphs and diagrams. Hint: Simply search for the name of the compound and the property you are looking for, such as benzene and "boiling point." Notable titles include:
CRCnetBASE is a collection similar to Knovel, that has titles related to chemistry and chemical engineering. It also contains a number of handbooks related to data on polymers. You can search across the entire collection or connect directly to specific titles of interest below:
There is another LibGuide devoted entirely to various sources for Chemical and Physical Data: