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A Metal-Encased Dewar Flask

A Metal-Encased Dewar Flask

  1. Dr. Jackal
    David Ritter
    J. Chem. Educ., 1995, 72 (1), p 70
    Publication Date: January 1995

    DOI: 10.1021/ed072p70

    Glass Dewar flasks are susceptible to implosion by either mechanical or thermal shocks. A previous article in this Journal describes using polyethylene battles to protect Dewar flasks from breakage. Far even greater protection, Dewar flasks may be purchased encased in metal cylinders, but these are expensive. In order to hold down costs while
    improving safety, a homemade metal-encased Dewar was constructed. The cast of the materials is about one-tenth the cost of a commercial flask. The homemade flask has held up well to use with liquid nitrogen.