KGW Isotherm 00–S22 Cylindrical Dewar Vessels Manufacturer Datasheet (C)
PDF · Manufacturer document
Dewar documents often list inner material, casing, lid, capacity and liquid-nitrogen data together. Assigning one temperature range to every component can mislead selection. Read the KGW glass and stainless-steel information by component.[1][2]
Which component does the temperature refer to?
| Component or construction | Manufacturer example | Interpretation |
|---|---|---|
| Glass inner vessel / stainless-steel vessel | −200 to +150 °C; briefly up to +200 °C | The documented vessel range, not every external accessory |
| External cushioning in the glass series | −10 to +60 °C | A separate external-material limitation |
| Polyurethane lid in the stainless-steel series | Up to +80 °C | Do not apply the vessel upper limit to the lid |
These are conditions for different series and parts, not one whole-unit rating. During heat exposure, cleaning or storage, identify the component actually exposed rather than checking only the inner vessel.[1][2]
Equal capacity still requires dimensional checks
Opening, diameter, height, handles and closure can differ at equal nominal capacity. Object access, handling and space requirements depend on dimensions; capacity cannot replace dimensional checks.
The stainless-steel table lists different approximate liquid-nitrogen holding times and evaporation rates for standard and wide-mouth versions at about 1000 mL. They should not be treated as equivalent solely by capacity. Test conditions are incompletely specified, so the figures are not guaranteed on-site holding times.[2]
A closure is not a pressure-sealing accessory
Retain the documented pressureless-use condition. A lid or stopper must not be interpreted as permission to seal and pressurise the vessel. Check venting, handling and protection against equipment instructions and laboratory safety procedures; this article is not a substitute operating procedure.
Selection checks
Separate capacity and useful dimensions, wetted materials, temperature, closure material, handling and medium suitability. For holding-performance comparisons, ask about filling and environmental conditions.
Confirm the exact item and accessories, not merely glass or stainless-steel Dewar. Vessel temperature, external-material limits and on-site holding behaviour are three distinct questions.
References
- [1] KGW Isotherm 00–S22 Cylindrical Dewar Vessels Manufacturer Datasheet (C), PDF page(s) 1–2 (file page order). View reference resource
- [2] KGW Isotherm DSS / GSS Stainless Steel Dewar Vessels Manufacturer Datasheet, PDF page(s) 1–2 (file page order). View reference resource