How has the insulation of the Junior isothermal bottle been tested?
Be careful when using hot liquids, the flask is extremely well insulated, liquids will remain hot for a long time.
The fuller the bottle is, the better it is at keeping its contents hot or cold.
We use double stainless-steel wall technology with a vacuum between to block thermal exchange via conduction or convection. To block exchange by thermal radiation, a fine layer of copper covers the outside of the inner wall.