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Beryllium is a steel-grey, brittle metal, existing naturally only as the 9Be isotope. Its compounds are divalent. Beryllium has several unique properties. It is the lightest of all solid and chemically-stable substances, with an unusually high melting point, specific heat, heat of fusion, and strength-to-weight ratio. It has excellent electrical and thermal conductivities. Because of its low atomic number, beryllium is very permeable to X-rays. Its nuclear properties include the breaking, scattering, and reflecting of neutrons, as well as the emission of neutrons on alpha-bombardment.

"This publication contains a criteria document for the establishment of an occupational exposure limit value for metallic silver prepared by the Department of Toxicology of the University of Nijmegen (the Netherlands) on behalf of the Commission of the European Communities. The objective of the study was to collect a broad spectrum of relevant data on metallic silver chemistry, production, occurrence in the workplace, toxicology, and evaluation of existing occupational exposure limits, where known. All data are interpreted with respect to human health risk and occupational exposure, and are summarized at the end of the report. This criteria document will be used in the preparation of legislation on 'limit values' for the protection of workers from the risks related to exposure to chemical, physical and biological agents at work."

"This publication contains a criteria document for the establishment of an occupational exposure limit value for phosphoric acid prepared by Environmental Resources Ltd (ERL) on behalf of the Commission of the European Communities. The objective of the study was to collect a broad spectrum of relevant data on phosphoric acid chemistry, production, occurrence in the workplace, toxicology, and evaluation of existing occupational exposure limits, where known. All data are interpreted with respect to human health risk and occupational exposure, and are summarized at the end of the report. This criteria document will be used in the preparation of legislation on 'limit values' for the protection of workers from the risks related to exposure to chemical, physical and biological agents at work."

"This publication contains a criteria document for the establishment of an occupational exposure limit value for ethanolamine prepared by the Institute of Occupational Health of the University of Birmingham (UK) on behalf of the Commission of the European Communities. The objective of the study was to collect a broad spectrum of relevant data on ethanolamine chemistry, production, occurrence in the workplace, toxicology, and evaluation of existing occupational exposure limits, where known. All data are interpreted with respect to human health risk and occupational exposure, and are summarized at the end of the report. This criteria document will be used in the preparation of legislation on 'limit values' for the protection of workers from the risks related to exposure to chemical, physical and biological agents at work."