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Analytical funnels for circular quadrant folded filter papers or pre-pleated filter papers. Standard 60° angles i.e. a circular filter shall have approximately the twice diameter as the stated size of the funnel. Analytical funnels are made of translucent PP. Buchner funnels of porcelain or PP. Last mentioned are two-piece for easy cleaning. In Buchner funnels can filter paper and glass fiber filters be used placed flat. The mentioned sizes are sizes(diameters) of the filters which can be used so the holes in the bottom of the funnel are covered. Guko rings in set of 8 sizes and made of rubber. The rings are cuffs which secure the funnel on a suction flask and ensure that vacuum can be created. Click column heading for sort