These filtering flasks are ideal wherever faster, more efficient liquid-solid separation is needed beyond what gravity filtration can achieve. Constructed with a heavy wall, bolt neck with tubulation, and reinforced rim, these flasks deliver reliable durability for repeated laboratory use. Manufactured from Type 1, Class A Borosilicate 3.3 glass that complies with ASTM E438, they feature low alkali content and are virtually free of magnesia-lime-zinc groups and heavy metals. The chemical composition, approximately 81% silica, 13% boric oxide, 4% sodium oxide, and 2% aluminum oxide, ensures excellent chemical resistance, low thermal expansion, and high clarity. Note: To maintain safe operation, vacuum applications should be limited to 5-minute intervals, with the existing vacuum released before restarting. The vacuum pressure should never exceed 600mm HG at any time.
- Borosilicate 3.3 glass (Type 1, Class A)
- Heavy rim & bolt neck with tubulation
- White enamel graduations for long-lasting visibility
- Suitable for vacuum applications: Limit to 5-minute intervals & do not exceed 600mm HG
- Temperature range: -50°C to 500°C (-58°F to 932°F)
- Material complies with ASTM E438