BS ISO 22531:2020 pdf free.Optics and photonics一Optical materials and components一Test method for climate resistance of optical glass.
BS ISO 22531 1 Scope This document specifies the test method for climate resistance of optical glass and the classification of the optical glass according to the test results.2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3585, Borosilicate glass 3.3一Properties ISO 3696, Water for analytical laboratory use一Specification and test methods ISO 14782, Plastics一Determination of haze for transparent materials 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: ISO Online browsing platform: available at https:// www.iso.org/obp IEC Electropedia: available at http://www.electropedia.org/Both sides of surfaces of each specimen shall be polished with cerium oxide slurry, then contamination shall be removed from the polished surfaces with an organic solvent. After that, the polished specimens are cleaned with detergent, distilled water and alcohols such as IPA (isopropyl alcohol). The detailed cleaning method shall be described in Annex B. The cleaning shall be started within 24 h after the polished surface has been exposed to the atmosphere, and after that, the test shall be started immediately. If the cleaning procedure of the specimens is started more than 24 h after polishing, the protective materials, i.e. the films or resins for the glass lens polishing process shall be applied to the polished surfaces immediately after polishing in order to avoid exposing the glass surface to the atmosphere. Dissolve the protective film with organic solvent or remove it before the cleaning of the specimens. Even with the presence of protective materials, keeping moisture away from the glass perfectly is difficult, so the storage period of the specimens should not exceed 100 h. Further, if the glass surface changes with a protective material, cleaning and testing process shall be started promptly after polishing without using the protective material. BS ISO 22531 pdf download.