Experts warn that using a thermos to store this type of water can easily cause toxicity and cancer.

On cold days, going out with a thermos is really ideal. Thanks to it, food and drinks are kept hot longer, even if we use high-quality thermos, we can keep the food hot for 12-24 hours.

However, to ensure health safety, as well as maintain the durability of the thermos, experts warn to remember a few important notes below.

Do not use a thermos to store acidic liquids.

Talking about thermos bottles, Associate Professor, Dr. Tran Hong Con (Chemistry Department, University of Natural Sciences, VNU) said that most thermos layers are made of stainless steel . This stainless steel layer will help increase the ability to keep food warm, while also being safe for users.

Acidic water will stimulate the release of heavy metals in stainless steel, leading to chemical reactions.

However, this stainless steel layer can react with acid. Therefore, you should not use a thermos or any stainless steel container to store acidic liquids such as: fruit juice, apricot juice, hawthorn juice, strawberry juice, pickled plum juice. or dishes such as pickled cucumbers, pickled eggplants, sour soups. Because these types of juice and dishes will stimulate the release of heavy metals in stainless steel, leading to chemical reactions, which can create some carcinogens, or less seriously, cause stomachaches and poisoning.

Mr. Con said that if the thermos is used to hold filtered water, tea, warm water or hot water, there is no problem, consumers can rest assured to use it.

How to choose a safe thermos?

Just take a look around the online market, it is not difficult for us to find thermos bottles with different prices, diverse in both form and type. Therefore, many people are feeling quite confused when choosing a safe, quality thermos bottle. Not to mention some types of poor quality bottles have been "accused" by authorities of having asbestos in the body of the bottle.

According to Associate Professor Dr. Tran Hong Con, manufacturers usually stuff asbestos between the stainless steel layers to help the stainless steel layer insulate better. In case the tank material is poor, asbestos can spread out, enter the bronchi, causing lung cancer and other dangerous diseases for human health.

A good thermos will have a thick layer of insulation, a slightly heavy thermos, sturdy legs, and a shiny metal shell.

"The first step to using a thermos safely is to choose a high-quality product. Good thermos bottles will have a thick layer of insulation, a slightly heavy bottle, a sturdy base, and a shiny metal shell. The plastic lid is made from virgin plastic, which does not cause unpleasant odors when exposed to heat. In addition, you should choose products from reputable brands that have been tested for safety and are trusted by many people ," said the expert.

Some notes when using thermos

• 1. When using a thermos, people should not suddenly change the water temperature from hot to cold and vice versa because this will affect the quality and lifespan of the thermos. When you want to change from cold water to hot water or vice versa, you need to let the thermos return to normal temperature for about 10-15 minutes before replacing with other water.
• 2. Absolutely do not arbitrarily break or disassemble thermoses to avoid spreading asbestos to the outside.
• 3. Do not put the thermos in the microwave or refrigerator. If the thermos is damaged or dented, it should not be used anymore.
• 4. After each use, when cleaning, you should turn the bottle upside down to prevent rust due to water remaining inside and help the bottle dry faster.

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