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Crude versions of conically tapered ground glass joints have been made for quite a while, [1] particularly for stoppers for glass bottles and retorts. [2] Crude glass joints could still be made to seal well by grinding the two parts of a joint against each other using an abrasive grit, but this led to variations between joints and they would not seal well if mated to a different joint.
A laboratory rubber stopper or a rubber bung or a rubber cork is mainly used in chemical laboratories in combination with flasks and test tube and also for fermentation in winery. [ 1 ] [ 2 ] [ 3 ] Generally, in a laboratory , the sizes of rubber stoppers can be varied up to approximately 16 sizes and each of it is specific to certain type of ...
ISO 2165:1974 Ware potatoes — Guide to storage; ISO 2166:1981 Carrots — Guide to storage; ISO 2167:1991 Round-headed cabbage — Guide to cold storage and refrigerated transport; ISO 2168:1974 Table grapes — Guide to cold storage; ISO 2169:1981 Fruits and vegetables — Physical conditions in cold stores — Definitions and measurement
Cork borers usually come in a set of nested sizes along with a solid pin for pushing the removed cork (or rubber) out of the borer. The individual borer is a hollow tube, tapered at the edge, generally with some kind of handle at the other end. A separate device is a cork borer sharpener used to hone the cutting edge to more easily slice the cork.
These are standardized, and can accept any similarly-sized tapered (male) fittings. 24/40 is common for 250 mL or larger flasks, while smaller sizes such as 14/20 or 19/22 are used for smaller flasks. Because of the round bottom, cork rings are needed to keep the round bottom flasks upright.
British Standard Pipe (BSP) is a set of technical standards for screw threads that has been adopted internationally for interconnecting and sealing pipes and fittings by mating an external thread with an internal (female) thread.
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