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These Kimble Chase KIMAX Erlenmeyer flasks have large opening, GL 45 thread closures to make filling easier and provide tight seals during storage. They come with blue polypropylene caps and clear seal rings and have marking spots and scales of durable white ceramic enamel.These flasks meet requirements for the American Society for Testing and Materials (ASTM) E438, Type I, Class A, Standard Specification for Glass in Laboratory Apparatus, and the glass conforms to USP Type I requirements. They are made from 33 expansion borosilicate glass, which has a low coefficient of thermal expansion and very high resistance to chemical attack. Kimble Chase Life Science and Research Products manufactures scientific laboratory glassware under the Kimble Chase KIMAX brand. The company has its origins in Kimble Glass and Kontes Glass and is now a division of The Gerresheimer Group..