ChemSpider is a free chemical structure database providing fast text and structure search access to over 39 million structures from hundreds of data sources.

Compendex® in Engineering Village is an interdisciplinary engineering database with over 9 million records referencing 5,000 engineering journals and conference materials dating from 1884. Coverage includes nuclear technology, bioengineering, transportation, chemical and process engineering, light and optical technology, agricultural engineering and food technology, computers and data processing, applied physics, electronics and communications, control, civil, mechanical, materials, petroleum, aerospace and automotive engineering as well as narrower subtopics within all these and other major engineering fields. Numeric data is indexed so results can be filtered within specific data parameters.

As well as all aspects of engineering, Knovel is useful for biotechnology, computing, food science, marine technology, molecular biology and chemistry. Subjects covered include technical reference books. There are Interactive graphs and tables,material and substance properties data and interactive equations. The Data Search tool can be used to build queries around different materials or substances.

Reaxys is a powerful chemistry data-searching tool designed to retrieve chemical reactions, substances and their properties, patent data and more. Reaxys can be searched in a number of ways, including by chemical structure, formula, and physical property parameters. Designed by chemists, Reaxys is a chemical sciences research solution that delivers facts the way chemists need them. NOTE: A personal account is needed to use this database, click on 'Activate personalization' or 'Not registered?' to set up an account. The registration process only needs to be completed once.

Scifinder-n is a powerful, chemist-curated database from CAS offering reference, substance and reaction searching with sophisticated analysis tools. Substances can be searched by chemical structure, markush (for Patents), molecular formula, property or substance identifier. All alternative substance names are listed alongside CAS Registry numbers and commercial sources. Tools including MethodsNow (showing every experimental step for ease of replication in the lab) and PatentPak (enabling you to get straight to the novel chemistry information in a Patent document). NOTE: To use SciFinder-n you must register with the database and create your own unique SciFinder-n username and password (NOT the same as your Newcastle University campus ID). You can then access SciFinder-n on and off campus through Library Search (proxy link).