KGW Isotherm Dewar Flasks with Melt on Laboratory Flat Flange
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KGW Isotherm Dewar Flasks with Melt on Laboratory Flat Flange

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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 Melt on Laboratory Flat Flange 11411 1200 NF 7 C 0 £971.89 1000 + -
KGW Isotherm Dewar Flasks with Melt on Laboratory Flat Flange 11412 1700 NF 8 C 0 £1104.12 1000 + -
KGW Isotherm Dewar Flasks with Melt on Laboratory Flat Flange 11413 2100 NF 11 C 0 £1133.58 1000 + -
KGW Isotherm Dewar Flasks with Melt on Laboratory Flat Flange 11414 3200 NF 14 C 0 £1249.75 1000 + -
KGW Isotherm Dewar Flasks with Melt on Laboratory Flat Flange 11415 4000 NF 17 C 0 £1458.57 1000 + -
KGW Isotherm Dewar Flasks with Melt on Laboratory Flat Flange 11416 5000 NF 19 C 0 £1550.56 1000 + -
KGW Isotherm Dewar Flasks with Melt on Laboratory Flat Flange 11417 8000 NF-S 22 C 0 £1621.98 1000 + -

Application

  • laboratory technology
  • medical technology
  • biotechnology
  • in plants where a gas-tight joint is required
  • for liquid and solid media and solids (LN2 or CO2)
  • suitable as insulating flask
  • if using gassing coolants, take care of the max. over pressure of 0,1 bar

 

Standards

  • type series NF: with laboratory flat flange DIN12214 NW60-NW150
  • dewar flasks according to DIN EN ISO 16496
  • made of Borosilicat-glass 3.3 nach ISO 3585

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

 

 

Technical Data

Type max. Content A A1 B C D E F Weight Laboratory flat flange
  ca. [ ml ] mm mm mm mm mm mm mm ca. [ kg ] DIN 12214
                     
NF 7 C 1200 67 57 80 90 350 395 445 1,0 NW60
NF 8 C 1700 67 57 80 90 500 560 610 1,1 NW60
NF 11 C 2100 77 57 95 105 345 395 445 1,8 NW60
NF 14 C 3200 90 97 115 124 600 665 725 1,2 NW100
NF 17 C 4000 110 97 120 130 600 660 720 1,7 NW100
NF 19 C 5000 110 97 130 140 600 660 720 3,2 NW100
NF-S 22 C 8000 138 147 160 165 600 660 735 4,6 NW150

 

    • SKU
      11411
    • Commodity Codes
      70172000
  • Manufacturer
    KGW-ISOTHERM
  • Country of Origin
    Germany
  • Capacity (ml)
    1200, 1700, 2100, 3200, 4000, 5000, 8000
  • Type
    NF 7 C, NF 8 C, NF 11 C, NF 14 C, NF 17 C, NF 19 C, NF-S 22 C

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.