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Classic vacuum flask makes perfect choice in heat retention

October 2nd, 2023

For many, a classic vacuum flask is perhaps an iconic item. Widely used as a household item in Vietnam's northern region for decades, it was meant to store everything from boiling water to soup and porridge. For over six decades of existence and development, Rang Dong has become the country's leading manufacturer of vacuum flask products, while its classic vacuum flask is the ultimate symbol of household items and resilience. We will have more details about the product further down.


Rang Dong’s classic vacuum flask, model 2035 N10.E, has a glass refill that combines silver plating with the vacuum technology, forming 5 layers of insulation. This is a secret to its excellent heat retention ability and a common feature among the company's thermos products. Users would be able to slowly enjoy the hot beverage all day long without having to worry about losing heat.

Having fully realized that the glass refill is in direct contact with the drink, Rang Dong has made the quality of the glass similar to what is being used in the health sector and laboratories, able to withstand high chemical content while ensuring heat stability and releasing no strange odors.

The flask opening uses a non-leaking mechanism that prevents the liquid from outflowing even if the vacuum flask falls or turns upside down, thus keeping the user safe. It is also equipped with a tight TPE gasket to prevent air inflow and outflow. The base allows the item to stand stably on any table surface, even if it is inclined up to 10 degrees.


With a 2-liter capacity, the RD 2035 N10.E classic vacuum flask is able to store enough hot water for the whole day. The flask can retain heat for up to 24 hours, keeping it over 80 degrees Celsius after the first 6 hours. Thus, warm water is always available. Further, the classic vacuum flask can prevent ice from melting for at least 8 hours and keep our drink cold for 24 hours.

Simple yet convenient, Rang Dong’s classic vacuum flask is here to stay.

Moreover, Rang Dong’s glass refill has an excellent feature: it is resistant to thermal shock, preventing itself from any cracking even if boiling water is suddenly poured into the flask. 

User’s notes

Before our first-time use, please make sure to wash up the classic vacuum flask thoroughly. It can be cleaned using warm water.

In order to get the best results, pre-fill the flask for 3 minutes with either hot or cold water, depending on whether we are going to store hot or cold water.

For removing stains, fill up the flask with warm water mixed with baking soda or vinegar (2:1 ratio) for about 15 minutes, depending on the hardness of the stains. Clean the flask with warm water after that.

User’s instruction

Should you have any questions or request a quotation for Rang Dong products, please send us an email at: export@rangdong.com.vn.

Websites: en.rangdong.com.vn and vacuumflask.rangdong.com.vn

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