ADDITIONAL SIZES/CUSTOM MANUFACTURED DEWARS Additional sizes are available in a premium line of Dewars, solid silvered, strip silvered or unsilvered, with or without bases. Capacities from 100 ml and up are available in either Spherical Narrow Mouth Dewars or Cylindrical Wide Mouth Dewars. Special shapes or customized Dewars made to your specific requirements are also available. Please contact us for more information and quotation. DEWAR SYSTEMS FOR LOW TEMPERATURE RESEARCH Pope Scientific also manufactures sophisticated all-glass Dewar systems for low temperature research in the liquid helium range. Please contact us for the "Equipment for Cryogenic Research Catalog" and a quotation.