Cargille Viscosity Tubes are manufactured to the closest possible tolerances and then precisely measured for final selection.
Length: 114mm +/-2mm
Wall Thickness: 0.65mm
Tolerance, ID: +/-0.025
Composition: Soda-lime glass, flat-bottom
Score Height Tolerance: +/-0.5mm
All Cargille Viscosity Tubes are permanently marked with two score marks, at 100mm and 108mm heights with the exception of Time-Test Viscosity Tubes, which have an additional score at 27mm. In compliance with ASTM D-1545, all score marks are measured from the center outside bottom of the tubes The score mark at 100mm represents the filling level and the 108mm score is used to fix the size of the air bubble in the tube by inserting a cork to this mark. The 27mm and 100mm scores on Time-Test Viscosity Tubes are used to time bubble rise. In instances where more than one viscosity tube size is used, in the same laboratory, an additional score is inscribed, on request, to differentiate between sizes.