Emissivity.org is the international hub for emissivity research, integrating open data (EKHI), measurement methods, laboratory capabilities, and community activity. It serves as the central platform for researchers, metrologists, and practitioners working with spectral emissivity and thermal radiative properties.
EKHI is an open, publication-centred database of optical and thermal radiative properties of solid materials, developed and maintained by the Thermomat group at the University of the Basque Country (EHU). It stores curve-level emittance, reflectance, transmittance and absorptance data digitised from the published literature (initially the TPRC Data Series), each record traced to its source publication. All datasets are freely downloadable and citable under CC-BY 4.0.
Browse the EKHI database directly (overview on our EKHI page). No account is required. Every dataset can be inspected as a table and downloaded in machine-readable JSON.
See the citation guide for detailed instructions. In general, cite both the original source publication and the EKHI record identifier.
Yes. If you have published spectral emissivity measurements, you can submit them to EKHI. The process involves providing the source publication, measurement metadata, and data files. Contributed data is reviewed and published with full attribution.
Laboratories with active emissivity or thermal radiation measurement capabilities can apply to join the network. Membership involves listing your capabilities, contributing to EKHI when possible, and participating in community activities.
The community references ISO and ASTM standards for emissivity measurement, including ISO 19618, ASTM E408, ASTM E903, and ASTM C835 (ISO 20473 supplies the spectral-band vocabulary used in reporting). The standards page provides details and community commentary.
Yes. The website, all EKHI data, and all published content are freely accessible. No registration or subscription is required.