Beakers - DURAN - 400ml. DURAN® low form beakers with graduations and spout. This top quality range of borosilicate beakers is manufactured to the exacting standards demanded by industry and pharma. At least the equal of any glassware on the market, these durable beakers provide a safe and reliable option for repeated use in any laboratory environment. Complete with fired-on white ceramic markings, the beakers feature highly uniform wall thickness for improved heating performance and resistance to cracking.