A thermos cup is usually a water container made of ceramic or stainless steel with a vacuum layer. There is a lid on the top of it, which is tightly sealed. Vacuum insulation layer can delay the heat dissipation of water and other liquids to achieve the purpose of insulation.

The thermos cup is developed from the thermos bottle, and the heat preservation principle is the same as that of the thermos bottle, except that people make the bottle into a cup for convenience.

There are several specific methods:

1. Simple identification method of vacuum insulation performance: pour boiling water into a thermos cup, tighten the cork or lid clockwise for 2-3 minutes, and then touch the outer surface of the cup by hand. If there is obvious temperature rise in the cup, it means that the product has lost its vacuum degree and cannot achieve good heat preservation effect.

2. Sealing performance appraisal method: After the cup is filled with water, tighten the bottle stopper and the cup cover clockwise, and put the cup flat on the table, without water leakage; The rotation of the lid and the mouth of the cup should be flexible and there should be no gap.

3. Identification method of plastic parts: Food-grade new plastics are characterized by small smell, bright surface, no burr, long service life and difficult aging. Ordinary plastics or recycled plastics are characterized by strong smell, dark color, many burrs and easy aging and fracture.

4. Simple capacity identification method: the depth of the inner tank is basically consistent with the height of the outer shell, and the capacity (phase difference 16- 18MM) is in line with the nominal value. Some poor quality thermos cups will add sand and cement blocks to make up for the missing weight. Myth: The weight of a cup (pot) is not necessarily good.

5. Simple identification method of stainless steel material: There are many specifications of stainless steel material, among which 18/8 means that the composition of this stainless steel material contains 18% chromium and 8% nickel. The materials that meet this standard are green products that meet the national food-grade standards, and the products are rust-proof and corrosion-resistant. Ordinary stainless steel cups are pale and dark in color. If it is soaked in salt water with the concentration of 1% for 24 hours, it will produce rust spots, and some elements contained in it will exceed the standard, which will directly endanger human health.