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The American Educational 7-300-000 series Erlenmeyer flask and screw cap are made of polypropylene which resists most chemicals, has excellent dimensional stability, and can be sterilized for storing chemicals and mixtures. The coarse threaded cap can be tightened to form a leak-proof seal. Both the flask and screw cap can be autoclaved and withstand temperatures up to 100 degrees C (212 degrees F). Flasks are glass or plastic containers for storing or collecting chemical samples or solutions in scientific laboratories. They come in a variety of sizes and shapes and are designed for a wide range of scientific processes. Erlenmeyer flasks, introduced by German chemist Emil Erlenmeyer in 1861, are shaped like a cone with a wide, flat base that narrows to a neck opening, which can be closed with a stopper or cap. American Educational Products manufactures educational and supplemental learning materials including math, science, and reading/language arts for pre-kindergarten through grade 12 students. The company, founded in 1986, is headquartered in Fort Collins, CO.