TECHNICAL INFORMATION
419
Ground Ware
is the symbol used to designate “standard taper” interchangeable joints, stoppers and stopcocks, complying with the requirements of ASTM E675 for stopcocks, stoppers and reagent bottle necks and E676 for interchangeable joints. All mating parts are finished to a 1:10 taper. The size of a particular piece appears after the appropriate symbol. Due primarily to the greater variety of apparatus equipped with fittings, a number of different types of identifications are used, as follows: Apparatus and Bottles • For joints — a two part number, as 24/40, with 24 being the approximate diameter in mm at the large end of the taper, and 40 the axial length of taper, also in mm. • For bottles — a single number, as 19, with 19 being the approximate diameter in mm of the opening at top of neck. • For glass stopcocks — a single number, as 2, with 2 being the approximate diameter in mm of the bore or bores through the plug. Flasks • For volumetric and Erlenmeyer flasks, graduated cylinders, etc. — a single number as 19, with 19 again being the approximate diameter in mm at top of neck; however, there are differences in dimensions between the bottle and flask stoppers, see the individuals listings in this catalog.
Standard Taper Symbol
is the designation for “spherical (semi-ball) joints” complying with ASTM E677.
The complete designation of a spherical joint also consists of a two part number, as 12/2, with 12 being the approximate diameter in mm of the ball and 2 the bore in mm of the ball and the socket.
Spherical Joint Symbol
is the symbol used to designate “product standard” compliance. Kimble glass stopcocks with plugs made of PTFE meet the requirements of ASTM Specification E911. The symbol is used to designate that Kimble stopcocks comply with this standard. All mating parts are finished to a 1:5 taper. Finally, for the PTFE plug ware, a single number is used, as with stopcocks. Thus, 2 means a stopcock with a bore of approximately 2 mm in the plug.
Product Standard Symbol
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