Name: KGW Isotherm Dish Shaped Dewar Flask With Structured Aluminium Cover
Brand: KGW-ISOTHERM
SKU: KGWDISHSHAPED
Rating: 5.00 (1 reviews)

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KGW Isotherm Dish Shaped Dewar Flask With Structured Aluminium Cover

SKU	Capacity (ml)	Type	Price (excluding VAT)	Availability	Qty To Purchase
1191	80	SCH 6 CAL	£266.92	1000	+ -
1192	120	SCH 9 CAL	£284.14	1000	+ -
1193	260	SCH 15 CAL	£400.92	1000	+ -
1194	400	SCH 18 CAL	£478.70	1000	+ -
1195	800	SCH 20 CAL	£592.19	1000	+ -
1196	1600	SCH 30 CAL	£797.00	1000	+ -
1197	2700	SCH 31 CAL	£1200.69	1000	+ -
1198	5300	SCH 33 CAL	£2073.53	1000	+ -

Area of application

laboratory technique
medicinal technique
Biotechnology
for liquid or solid medias and solid matters (LN2 oder CO2)

Features of performance

reliably and economically
Dewar flasks according to DIN EN ISO 16496
glass material according to ISO 3585
nominal capacity from 80ml to 5,3 litres
protective casing made of stucco aluminium

Description of complete flasks

Temperature ranges

glass refill from -200°C to + 150°C, for a short time 200°C
casing with mounting rubber and Latizell buffer from -10°C to + 60°C

Pressure range

pressure - less

Technical data

Type	max. Content ca. [ ml ]	A mm	B mm	C mm	D mm	E mm	Weight ca. [ kg ]	for round bottom flask Ø a. [ mm ]	with Content max. [ ml ]
SCH 6 CAL	80	67	80	90	40	75	0,2	51	50
SCH 9 CAL	120	77	95	110	50	90	0,2	64	100
SCH 15 CAL	260	100	120	130	65	110	0,4	85	250
SCH 18 CAL	400	110	130	138	70	115	0,5	85	250
SCH 20 CAL	800	138	160	170	80	125	0,6	105	500
SCH 30 CAL	1600	170	205	215	110	145	1,5	131	1000
SCH 31 CAL	2700	200	230	238	125	160	2,1	185	3000
SCH 33 CAL	5300	250	280	292	150	195	3,2	236	6000

Safety advises and regulations

always wear protective glasses and protective gloves
national regulations for laboratories
company- internal regulations
safety regulations for handling with liquid gases

- SKU
  1191
- Commodity Codes
  70172000
Manufacturer
KGW-ISOTHERM
Country of Origin
Germany
Capacity (ml)
80, 120, 260, 400, 800, 1600, 2700, 5300
Type
SCH 6 CAL, SCH 9 CAL, SCH 15 CAL, SCH 18 CAL, SCH 20 CAL, SCH 30 CAL, SCH 31 CAL, SCH 33 CAL

KGW Isotherm Dish Shaped Dewar Flask With Structured Aluminium Cover Datasheet

(1.5 MB)

KGW Isotherm Dish Shaped Dewar Flasks

(1.8 MB)

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.