vAn extensive and historical repository system: experimental thermophysical and thermochemical properties and relevant measurement information vComprehensive coverage: up to 100 properties of over 2 million records for 32,000 chemical systems including pure compounds, mixtures, and reaction systems vInformation Complexity: bibliographic information, chemical system identifiers, sample purity, property values and the relevant state variables, estimates of uncertainty, measurement methods, and a variety of other metadata vSophisticated data organization and structures: a complete measurement is described by six types of records involving 37 tables, within each data table up to near 80 columns