ISO 641:1975 Preview
Laboratory glassware -- Interchangeable spherical ground joints
This standard was last reviewed and confirmed in 2017. Therefore this version remains current.
The requirements deal with the geometric charateristics to ensure interchangeability. The dimensions of the joint-ground zone and the outer diameter of the tube connected to the joint are given in a table and illustrated in a drawing. In addition the surface finish is specified. A system of gauges (stell balls) for testing the ball cup is tabled. In the annex a method of testing the leakage including the apparatus is described.
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