Flasks are made of red-tinted glass that provides protection from UV light

All flasks are graduated to Class A volumetric tolerances. Flasks with 5–250mL capacity are calibrated to meet ASTM Specification E288.

Feature wide mouth for easy pipet access and heavy, uniform walls for strength, durability, and safety. Interior bottoms are flat, allowing for efficient stirring with standard stir bars. Large, permanent markings allow for quick, accurate identification.