The physical properties source index lists recommended databases, handbooks, and websites (data, definition, measurement) for physico-chemical and other material properties.
The PPSI had been programmed as a system of polyhierarchical thesauri using the database FileMaker. The thesauri are in German and English and can be extended for other languages. AJAX (Asynchronous JavaScript And XML) and FileMaker XML/XSLT Custom Web Publishing are used as WWW technologies.