KGW Isotherm Dewar Flasks with Glass Screw Thread
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KGW Isotherm Dewar Flasks with Glass Screw Thread

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KGW-ISOTHERM
  • Special manufactured products are excluded from being returned
SKU Capacity (ml) Type Weight (In Grams) Price (excluding VAT) Availability Qty To Purchase
KGW Isotherm Dewar Flasks with Glass Screw Thread 1091 100 GEW 00 I 0 £604.86 1000 + -
KGW Isotherm Dewar Flasks with Glass Screw Thread 1092 200 GEW 0 I 0 £606.04 1000 + -
KGW Isotherm Dewar Flasks with Glass Screw Thread 1093 300 GEW 1 I 0 £611.41 1000 + -
KGW Isotherm Dewar Flasks with Glass Screw Thread 1094 450 GEW 2 I 0 £612.45 1000 + -
KGW Isotherm Dewar Flasks with Glass Screw Thread 1095 100 GEW 00 II 0 £604.86 1000 + -
KGW Isotherm Dewar Flasks with Glass Screw Thread 1096 200 GEW 0 II 0 £606.04 1000 + -
KGW Isotherm Dewar Flasks with Glass Screw Thread 1097 300 GEW 1 II 0 £611.41 1000 + -
KGW Isotherm Dewar Flasks with Glass Screw Thread 1098 500 GEW 3 II 0 £660.64 1000 + -
KGW Isotherm Dewar Flasks with Glass Screw Thread 1099 750 GEW 4 II 0 £734.79 1000 + -
KGW Isotherm Dewar Flasks with Glass Screw Thread 10910 800 GEW 6 II 0 £744.55 1000 + -
KGW Isotherm Dewar Flasks with Glass Screw Thread 10911 1200 GEW 7 II 0 £751.75 1000 + -

Application

  • laboratory technology
  • medical technology
  • biotechnology
  • lockable Dewar flasks
  • for liquid and solid media and solids (LN2 or CO2)
  • if using gassing coolants, take care of the max. over pressure of 0,1 bar!

Versions

  • designs and accessories:
  • C = blue-coated metal cover
  • A = glass refill (without cover)
  • available:
    -fully silvered ( standard )
    -silvered with viewing stripes
    -not silvered
    -shortened

Advantages

  • with standard-glass screw thread DIN 168 GL32 or GL45
  • dewar flasks according to DIN EN ISO 16496
  • made of Borosilicat-glass 3.3 nach ISO 3585


Technical data

Type max. Content A B C D E F Weight screw flange
  ca. [ ml ] mm mm mm mm mm mm mm ca. [ kg ]
                   
GEW 00 I 100 40 56 63 90 135 190 0,2 GL32
GEW 0 I 200 40 56 63 170 215 270 0,3 GL32
GEW 1 I 300 47 60 72 190 240 295 0,3 GL32
GEW 2 I 450 47 60 72 270 310 365 0,5 GL32
                   
GEW 00 II 100 40 56 63 90 135 190 0,2 GL45
GEW 0 II 200 40 56 63 170 215 270 0,3 GL45
GEW 1 II 300 47 60 72 190 240 290 0,3 GL45
GEW 3 II 500 57 70 81 210 260 320 0,5 GL45
GEW 4 II 750 57 70 81 310 370 430 1,0 GL45
GEW 6 II 800 67 80 90 240 295 355 0,6 GL45
GEW 7 II 1200 67 80 90 350 395 455 0,9 GL45

 

 

 

    • SKU
      1091
    • Commodity Codes
      70172000
  • Manufacturer
    KGW-ISOTHERM
  • Country of Origin
    Germany
  • Capacity (ml)
    100, 200, 300, 450, 500, 750, 800, 1200
  • Type
    GEW 00 I, GEW 0 I, GEW 1 I, GEW 2 I, GEW 00 II, GEW 0 II, GEW 1 II, GEW 3 II, GEW 4 II, GEW 6 II, GEW 7 II

Dewar flasks made of glass

All Dewar flasks manufactured by KGW-ISOTHERM are made of borosilicate glass 3.3 DIN / ISO 3585 made by DWK or Schott Tubing. They are manufactured in compliance with the "Pressure Equipment Directive", Directive 97/23 EC, (N4 with Annex 1) and DIN EN ISO 16496 "Vacuum Insulation Equipment".

 

Structure and function of a Dewar flask out of glass

Dewar flasks made of glass are double-walled vacuum-insulated containers. They are used to thermally insulate a stored product (LN2, CO2 or other coolant) from the ambient temperature. Dewar flasks consist of an inner and an outer bulb, which are fused together at the top of the neck opening. The space between the inner and outer pistons is vacuum insulated to prevent thermal contact between the products stored in the Dewar with the ambient temperature (contact heat). In addition, Dewar flasks made of glass are equipped with a silver coating in the vacuum space in order to minimize heat radiation. Best insulation can be achieved by reducing both contact heat (vacuum) and radiation heat (silvering).

For security and work safety reasons, Dewar flasks made of glass always have to be installed in a protective enclosure. This protective cover can be made of sheet metal, aluminum, stainless steel or a transparent PU coating.

All standard glass Dewar flasks only may be used up to a maximum overpressure of 0.1 bar. Higher working pressures on request.

 

Complete or partly silvered plating’s and their influence on the evaporation rates

 Regarding silvered glass Dewar flasks, a distinction has to be made between full silver plating (standard), silver plating with viewing stripes and unsilvered - transparent (customized special design). The lowest radiation losses (heat radiation) are obtained when having the full silver plating. Thus also the lowest evaporation rate / best static holding time of the stored refrigerant are reached with full silver plating. By attaching a viewing stripe in the silver layer, you change the reflection of the radiant heat and therefor also the insulation performance. The bigger a viewing stripe is or the more viewing stripes are incorporated in a silver plating, the greater is the loss of energy of the refrigerant stored in the Dewar vessel. The diagram shows the evaporation rates of liquid nitrogen in a Dewar flask type 15 C, 1.5 liter capacity with different kind of silver layings.

 

Accessories