flaskse vaccum flask set Tea Urn (500 ml)

2cups and 1 bottle 1 bottle cap cup

flaskse

vaccum flask set

500

stainless steel

No

1

Double-Wall Vacuum Insulation The flask should have two walls with a vacuum (or very low pressure) between them. That vacuum greatly reduces heat transfer by conduction and convection. Wikipedia +2 ExperiHub Learning +2 Often, the inner wall has a reflective (silvered) coating to reflect radiant heat back inside, which improves insulation, High-Quality Material Use of food-grade stainless steel (typically 304 grade) for inner and outer walls — gives durability, corrosion resistance, and safety. qqjiali.com +1 The material should not leach harmful substances and be odor-free., Temperature Retention Ability to keep liquids hot for long hours (e.g., 12 hours) and cold for many hours — thanks to the vacuum insulation. topnovocn.com Good lid / stopper design to minimize heat loss from the opening