These VWR? Measuring Cylinders are manufactured from crystal-clear TPX (Polymethylpentene), and offer excellent chemical resistance. The autoclavable cylinders feature a stable hexagonal base and a pouring spout. All cylinders also feature molded graduations for improved accuracy and consistency. When used continuously, the cylinders have a working temperature of 0 to 121°C (32 to 248°F). When used for short periods, they can withstand temperatures as high as 170°C (338°F).