Calibrated "to contain"
Standard Taper stoppers (4997K13 to K76)
- Size 2 mL is test-tube shape and not marked A (as tolerances are larger)
- Sizes 5 mL and larger are designed for Federal Specification NNN-F-289 and meet ASTM Standard E 288
- Capacity/stopper size given in listings
Supplied with color-coded PTFE stoppers (4997L15 to L65)
Flasks have marking spots on all sizes 10 mL and larger. The 2 mL size is test tube shaped; all other sizes are conventional flask shape. The 5 mL and larger sizes are designed from requirements for Type 1, Class A “unserialized” flasks of Federal Specification NNN-F-289 and for precision grade flasks of ASTM specification E 288.
Capacity/stopper size given in listings.
Standard Taper ground mouth fitted with polyethylene stopper (4997N30 to N82)
- 2 mL flasks are not Class A