Short form lowers the center of gravity for increased stability and reduced spills. All cylinders have a circular base and are available in highly transparent PP (polypropylene) or crystal clear SAN (styrene acrylonitrile copolymer), with molded graduations. PP cylinders can tolerate temperatures of up to 80 deg C, while the SAN cylinders can tolerate temperatures of up to 60 drg C, without causing permanent exceeding of tolerance limits.