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ISO 9689:1990
M00000761
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ISO 9689:1990 Raw optical glass - Resistance to attack by aqueous alkaline phosphate-containing detergent solutions at 50 degrees C - Testing and classification
standard by International Organization for Standardization, 12/01/1990
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Specifies a method for testing the resistance of raw optical glasses and a classification of optical glasses according to the aqueous alkaline phosphate-containing detergent resistance (phosphate resistance) determined by this method.