The smallest Spearlab foam dewar (smaller dewar in displayed image), the cylindrical cavity in this vessel is 2 inches in diameter by 3.5 inches deep, so that it easily holds 130 ml and a maximum volume of 175 ml of liquid nitrogen. Perfect for dermatology and other applications that require a small quantity of cryogenic liquid.
 
Spearlab foam dewars are effective and durable vessels for handling liquid nitrogen and cryogenic materials. They have gained acceptance as the preferred containers for x-ray crystallography samples, and also are used in a wide variety of other cryogenic applications. Unlike conventional glass and stainless steel Dewar flasks which depend upon a vacuum layer for insulation, Spearlab foam dewars use a fine closed cell foam for insulation. This foam material is chemically inert and mechanically durable enough to be exposed directly to liquid nitrogen, without leaking or degrading.