Large graduated cylinders are usually made up of polypropylene for its excellent chemical resistance or polymethylpentene for its transparency, making them lighter and less fragile than glass. Polypropylene (PP) is easy to repeatedly autoclave; however, autoclaving in excess of about 121 ° C (250 ° F) (depending on the chemical formulation: typical commercial grade polypropylene melts in excess of 177 ° C (351 ° F)), can warp or damage polypropylene graduated cylinders, affecting accuracy.
what is a graduated cylinder made out of
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