A standard is "a recognized unit of comparison by which the correctness of others can be determined." Another definition is "a set of characteristics or qualities that describes features of a product, process, or service." (Source: StandardsLearn.org)
Scientific and Professional Organizations such as the ASTM, ASME, IEEE, trade organizations, and governments produce standards. In the United States, the American National Standards Institute (ANSI) coordinates many standards producing organizations. The International Organization for Standardization (ISO) is the world's largest developer and publisher of International Standards.
ASTM Compass (ASTM International Digital Library) is one of the largest voluntary standards development organizations in the world-a trusted source for technical standards for materials, products, systems, and services. Known for their high technical quality and market relevancy, ASTM International standards have an important role in the information infrastructure that guides design, manufacturing and trade in the global economy.
IEEE Xplore, under the banner of the Institute of Electrical and Electronics Engineers, provides full text access technical literature in electrical engineering, computer science, and electronics. Content includes electronic journals, magazine, and books; conference proceedings; standards; and Standards Dictionary Online. Most articles are available in PDF and HTML. Tools include links to citations, references and figures.
API features are available through the IEEE Xplore API Portal with account registration and application for an API key: https://developer.ieee.org/
