ISO 7057:1981 Preview
Plastics laboratory ware -- Filter funnels
This standard was last reviewed and confirmed in 2017. Therefore this version remains current.
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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