NIST distributed the NIST Properties of Molten Salts Database from 1990 to 2004. As part of the NIST Standard Reference Data Program, the database was designated as Standard Reference Database 27 or SRD 27. Since the database has not been actively maintained since 1991 the SRD designation has been dropped. The database was distributed as a program for DOS compatible operating systems. To enable use of the data on modern systems, the data have been extracted into comma separated variable (CSV) files. The CSV format should be readable by various programs and provides a stable format for long term preservation of the data. The database was designed to provide engineers and scientists rapid access to critically evaluated data for inorganic salts in the molten state. Properties include density, viscosity, electrical conductance, and surface tension, although not all properties are given for all salts. Properties for approximately 320 single salts and 4,000 multi-component systems are included, the latter being primarily binary. Some data for more complex salt mixtures are also given.