The National Institute of Standards and Technology (NIST) recently published the NIST Standard Reference Database #152, the Cryogenic Materials Properties Dabase online as a freely available resource. NIST has published over 80 of its databases freely available online, including the Ceramics WebBook, the Chemistry WebBook and the Kinetetics and Solubility databases.  A complete list is available at the NIST Data Gateway.

Not all NIST database are free though.  The Chemistry and Chemical Engineering Library is considering purchasing online access for the NIST TRC Thermdynamic Tables for Hydrocarbons and Non-Hydrocarbons.  If you have comments on this database, please send them to mmahoney@library.berkeley.edu.