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ISO 7057:1981
Plastics laboratory ware -- Filter funnelsstandard by International Organization for Standardization, 09/01/1981
Six preferred sizes are defines by their internal bowl diameter. General design are shown in a figure and the dimensions are tabled. The material shall be general non-brittle plastics. Annex A concern the determination of resistance to extraction of ionic material by water, Annex B describes the flexibility test.
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