The Wiggins flange-top Dewar bottle is airtight and airtight. If you use a volatile coolant, please note that the maximum pressure is 0.1 bar. The flange connection is made of 3.3 borosilicate glass. It is suitable for storing low-temperature products such as liquid nitrogen and dry ice. Wiggins Flanged Dewar can also freeze and store a small amount of samples in the laboratory, and has a matching cover to prevent evaporation. It can be customized with observation window, the NF-type flange-mouth Dewar bottle has a Schott flange mouth, and the F-type flange-mouth Dewar bottle has a flat flange mouth.