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This is the original version (as it was originally adopted).
1.Filters (optics and glasses) and optical glasses may be made of organic glass (synthetic glass) or inorganic glass (silicate glass).
Filters and optical glasses of silicate glass shall be made of a glass at least of the class IV hydrolytic type referred to in ISO standard 719 guaranteeing durable resistance to water.
Filters and optical glasses of synthetic glass shall have a durable resistance to water comparable with those made of silicate glass.
Optical glasses shall be manufactured in glass with low internal stress.
2.Filters and optical glasses shall as far as possible be free of blisters, bubbles and impurities. There shall be no surface defects such as unpolished (matt) sections, deep scratches, etc.
3.Filters and optical glasses shall meet the requirements of Article 3.01. Their photometric and colorimetric properties shall not be affected by those conditions.
4.The red and green optical glasses of the side lights shall not be interchangeable.
5.In addition to the manufacturer's mark, the approval number and the type description shall be legibly and durably marked on filters and optical glasses at a point remaining visible once they have been placed in the lanterns.
These markings shall not result in values below the minimum photometric and colorimetric requirements.
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