This 250ml polymethylpentene beaker has the transparency of glass excellent chemical resistance and remarkable heat tolerance - can be used continuously at 150°C with intermittent service to 175°C. Beaker has easy-to-read silk-screened graduations plus catalog number size code resin code maximum use temperature and 'no flame' symbol. Not for use on a hot plate. Meets ISO/DIS 7056 International Standards for Laboratory Plasticware Beakers. Polymethylpentene. Capacity: 250ml. 6/pack; 4 Packs/Case. Nalgene® #: 1203-0250.