Volumetric flasks of polypropylene and autoclavable. These flasks create nomeniscus so final readings are easy. Calibrated gravimetrically at 20°C. Translucency of PP enhanced when in contact with liquid. Thick walls eliminate distortion.Thin neck make final reading precise. Autoclavable. Chemically non absorbant. No wetting. Screw caps included. Suitable for foodstuff.