Nova-Tech International offers a wide variety of flasks including, boiling, volumetric, filtering and many others. Most of the glass volumetric flasks are ASTM E-288 or E-237 Class A Specifications & USP Standards for volumetric glassware. Many of these flask feature machine-blown bodies and heavy-beaded, heavy-tubing necks. Our filtering flasks feature heavy-duty rims to reduce chipping, white, permanent graduations, and large marking squares. Made from high-quality borosilicate tubing with a low coefficient of expansion. Borosilicate tubing also provides uniform wall thickness resulting in the optimum balance between thermal shock resistance and mechanical strength.