Volumetric flasks of PMP (TPX®) and autoclavable. These crystal clear volumetric flasks create no meniscus so final readings are easy. Calibrated gravimetrically at 20°C. Thick walls eliminate distortion. Thin necks make final measurement precise. Autoclavable to 170°C. Chemically cleaner than glass and chemically nonabsorbant. No wetting. Screw caps included. Suitable for foodstuff.