Flask , jointware

Round-bottom (R.B.) jointware flasks are so round and innocent looking, that you would never suspect they can turn on you in an instant. 

Conical flasks should be clamped at the neck and ground-glass jointware should be clamped at the joint - this usually has the greatest thickness of glass. 

Do not attempt to use non-standard ground-gibss joints in the standard jointware, it will not fit correctly For example, ground-glass stoppers fro volumetric flasks do not seal Quickfit separatory funnels. - ... 

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