Dewar flasks are double walled vacuum insulated flasks made of glass or metal, which have the task to thermally insulate a therein-stored product (LN2; CO2 etc.) against the ambient temperature. Dewar flasks consist of an inner and an outer recipient, which are connected on top at the filling port. The space between the inner and the outer flask is vacuum insulated, to stop the heat contact between the product stored in the Dewar flask and the ambient temperature (contact warmth).
Dewar flasks made of glass have a silver coating in the vacuum space, in order to minimise the warmth radiation. The best possible insulation could be received by reducing the contact warmth and the radiation warmth.     
Cold traps with dewar flask are used in conjunction with vacuum pumps to collect condensation produced from humidity or solvents and these cold traps can be used for many different tasks.
The most common application is collecting condensation produced from humidity or solvents from rotating discs, vacuum pumps or high vacuum systems that use’s oil diffusion or turbo-molecular pumps.


Dewar Flask with Trap and Safety Mesh
Part.No.   Glass Trap
71155 Dewar Flask Assembly 1000 ml 150 ml
71156 Dewar Flask Assembly 2000 ml 250 ml
71157 Dewar Flask Trap  150 ml
71158 Dewar Flask Trap  250 ml
71159 Safety Mesh 1000 ml
71160 Safety Mesh 2000 ml
* Assembly Contains Dewar Flask, Glass trap, and Safety mesh with ring