Heavy hexagonal base provides stability to prevent cylinder from tipping over
- ASTM Class A cylinders are calibrated "to deliver" (TD)
- Class A, Type 1 borosilicate glass withstands temperatures from -58°F to 1022°F (-50°C to 550°C)
- Graduations are durable white enamel
Reference: ASTM E1272 Class A tolerances and specifications.