An excellent alternative to glass flasks, these plastic volumetric flasks meet Class B tolerances per DIN EN ISO 1042. Gravimetrically calibrated “to contain” at 20°C. Available in crystal clear PMP or highly transparent PP, with PP stopper caps or screw caps. The PMP flasks can tolerate thermal stress of up to 121°C (autoclaving) without permanent exceeding of the tolerance limits (PP flasks up to 60°C). However, to preserve markings, cleaning at no higher than 60°C is recommended.