- Calibrated "to contain", they are designed from ASTM Specification E288, Class B requirements
Sizes 10 through 50 mL include Standard Taper 9 glass stopper; size 100 mL, Standard Taper 13; sizes 200 and 250 mL, Standard Taper 16, size 500 mL, Standard Taper 19; 1,000 mL, Standard Taper 22 and size 2,000 mL, Standard Taper 27