Thermos cups are a kind of portable water cups that many people use, especially office workers and students who mainly use thermos cups. The most interesting point of the vacuum flask is its thermal insulation capacity and the safety of the material. There are many types of vacuum flasks on the market. How can I choose a high-quality vacuum flask? The method of judging the quality of thermos cups. I hope to provide you with some help when you buy a thermos.

1. Simple identification method of vacuum insulation performance: Pour boiling water into the thermos cup and tighten the cork or lid clockwise for 2-3 minutes, then touch the outer surface of the cup body with your hands. If the cup body is obviously warm, it means the product The vacuum degree has been lost and a good thermal insulation effect cannot be achieved.

2. Simple capacity identification method: the depth of the inner tank is basically the same as the height of the outer casing, and the capacity (with a difference of 16-18MM) is consistent with the nominal value. Some poor quality thermos cups add sand and cement blocks to the cup to make up for the missing weight. Myth: Heavier cups (pots) are not necessarily good.

3. Sealing performance identification method: after adding water to the cup, tighten the cork and cup cover clockwise, and place the cup flat on the table, there should be no water leakage; the screwing of the cup cover and the cup mouth should be flexible without gaps .

4. Simple identification method of stainless steel materials: There are many specifications of stainless steel materials, of which 18/8 means that the composition of this stainless steel material contains 18% chromium and 8% nickel. Materials that meet this standard meet the national food-grade standard and are green and environmentally friendly products. Rust and corrosion resistant. The color of the ordinary stainless steel cup is whitish and dark. If it is soaked in salt water with a concentration of 1% for 24 hours, rust spots will occur. Some of the elements contained in it exceed the standard, which directly endangers human health.

5. Recognition method of plastic parts: The characteristics of food-grade new plastics are small smell, bright surface, no burrs, long service life and not easy to age. Ordinary plastics or recycled plastics are characterized by strong odor, dark color, many burrs, and plastics are easy to age and break.