• Material: Metal Iron body vacuum flask with glass refill 
• Capacity: 2L,3.2L
• Customized logo are welcome
• Handle can be made on it
• Packing:12pc/ a carton, with the PP bag and the color or white inner box , individal export standard packing
• After 24 hours heat preservation in accordance with international standards
• the glass refill keep above 70 centigrade degree after 24 hours.
• we have decades of the experiences in the glass refill areas
• we have many materials, such as the stainless steel ,iron, aluminum ,plastic , 500 variety and specifications.
• we have given you a very favorable price,  our price will be less 1  U.S. dollar than other company.

How to test insulation quality of the vacuum flask?

• Check the inside (that is, the suction mouth) is intact, if there is a break between layers is damaged inside the vacuum, lost heat preservation ability.

• Look inside presence of blowout trace.

• See if bottle is round. If you don't round bottle, bottle stopper can't seal, will reduce the heat preservation ability.

•Fill it with boiling water and cap it.

•Measure its temperature with a thermometer every hour or two and see what the temperature graph looks like

My company production is not only superior quality, but also economy, and fashion.

What is a vacuum flask glass refill&thermos flask

The vacuum flask consists of two flasks, placed one within the other and joined at the neck. The gap between the two flasks is partially evacuated of air, creating a near-vacuum which prevents heat transfer by conduction or convection. Heat transfer by thermal radiation may be minimized by silvering flask surfaces facing the gap but can become problematic if the flask's contents or surroundings are very hot; hence vacuum flasks usually hold contents below the boiling point of water. Most heat transfer occurs through the neck and opening of the flask, where there is no vacuum. Vacuum flasks are usually made of metal, borosilicate glass, foam or plastic and have their opening stoppered with cork or polyethylene plastic. Vacuum flasks are often used as insulated shipping containers.

How to test insulation quality of the vacuum flask?

•  Check the inside (that is, the suction mouth) is intact, if there is a      break between layers is damaged inside the vacuum, lost heat        preservation ability.

•  Look inside presence of blowout trace.

•  See if bottle is round. If you don't round bottle, bottle stopper            can't seal, will reduce the heat preservation ability.

•  Fill it with boiling water and cap it.

•  Measure its temperature with a thermometer every hour or two        and see what the temperature graph looks like

Directions for use

1,  the cork don't fit too tight.
2,  pour cold water into hot water before the bottle net.
3,  thermos bottom cushion pad tight at any time, to avoid loose            inside so as to avoid damage.
4,  when the hot water to avoid pumping metal shell on the bottle          mouth, lest cause broken inside.
5,  when used to avoid violent vibration, carefully protect highlight        the tails, so as not to lose heat preservation performance.
6,  bottle inner product have scale, can pour into acetic acid or hot        yellow vinegar, rice vinegar to dissolve slowly, don't use hard          material such as shock washing sliders.