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ISO 3195:1975
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ISO 3195:1975 Sodium hydroxide for industrial use -- Sampling -- Test Sample -- Preparation of the main solution for carrying out certain determinations
standard by International Organization for Standardization, 03/01/1975
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Indicates the conditions under which the test sample shall be prepared and relates to particular properties which require particular precausions: the samples shall be taken rapidly in a dry atmosphere, storage in an airtight bottle. The bottle shall be made from an inert material such as polyethylene. Preparation of the main solution with distilled carbonat- free water. If the silica content is to be determined the test portion shall be dissolved in a container made from silica-free material such as polyethylene or silver. Cancels and replaces ISO Recommendations R 977/1969 and R 978/1969.