NASA's technical glossary describes James Dewar's vessel as a double-walled metal or glass container with a vacuum between its walls. Keep that laboratory history distinct from commercial Thermos branding and patent claims.
When comparing current containers, hold product, fill quantity, starting condition, lid openings and route consistent. Record the instrument and sensor position as well.
Review temperature records alongside receipt findings. Lid use, cleaning and staff handling all matter when selecting for your product.
The foam body is a decision taken across the whole family. GEBHARDT offers Isotec in nine sizes, from 410 to 1500 litres.