Difference between revisions of "Stopcock"
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A stopcock consists of an elongated conical item with a handle and a ground glass joint, always male. Most models are full glass and have a two or three way bored holes and are full glass. Other models, are hollow and have two bored holes. Stopcocks are made of borosilicate glass or [[Polytetrafluoroethylene|PTFE]]. | A stopcock consists of an elongated conical item with a handle and a ground glass joint, always male. Most models are full glass and have a two or three way bored holes and are full glass. Other models, are hollow and have two bored holes. Stopcocks are made of borosilicate glass or [[Polytetrafluoroethylene|PTFE]]. | ||
| − | Stopcocks are often parts of laboratory glassware such as ([[automatic burette|automatic]]) [[burette]]s, [[chromatography column]], [[Dean-Stark apparatus]], [[dropping funnel]]s, [[Imhoff cone]], [[Schlenk flask]]s/[[Schlenk line|lines]], [[separatory funnel]]s, various [[adapter]]s. | + | Stopcocks are often parts of laboratory glassware such as ([[automatic burette|automatic]]) [[burette]]s, [[chromatography column]], [[Dean-Stark apparatus]], [[dropping funnel]]s, [[gas collecting tube]], [[Imhoff cone]], [[Schlenk flask]]s/[[Schlenk line|lines]], [[separatory funnel]]s, various [[adapter]]s. |
==Availability== | ==Availability== | ||
Revision as of 19:35, 3 March 2018
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A stopcock is a form of valve used to control the flow of a liquid or gas.
General
A stopcock consists of an elongated conical item with a handle and a ground glass joint, always male. Most models are full glass and have a two or three way bored holes and are full glass. Other models, are hollow and have two bored holes. Stopcocks are made of borosilicate glass or PTFE.
Stopcocks are often parts of laboratory glassware such as (automatic) burettes, chromatography column, Dean-Stark apparatus, dropping funnels, gas collecting tube, Imhoff cone, Schlenk flasks/lines, separatory funnels, various adapters.
Availability
Stopcocks can be bought from lab suppliers or online.
You can also scavenge them from broken glassware, like separatory funnels.
Maintenance
Make sure stopcocks are always well greased. Teflon stopcocks do not normally require greasing.
