1. simple identification method of thermal insulation performance: pour boiling water into a thermos cup and tighten the cork or lid clockwise for 2-3 minutes, then touch the outer surface of the cup body by hand. If the cup body has obvious warming phenomenon, especially the lower part of the cup body is heated, it means that the product has lost its vacuum degree and cannot achieve good thermal insulation effect, but the lower part of the thermos cup is always cool.

Myth: Some people use their ears to determine the thermal insulation performance, but they can't tell whether it is vacuum.

2. sealing performance identification method: after the cup is filled with water, tighten the bottle stopper or cup cover clockwise, and put the cup flat on the table, so that there is no water leakage; The screw-in and screw-out of the cup (pot) cover and the cup mouth should be flexible without gap. Fill a glass of water and turn it upside down for four or five minutes, or shake it hard a few times to verify whether it leaks.

3. Identification method of plastic parts: New food-grade plastic features: small smell, bright surface, no burr, long service life and difficult aging. The characteristics of ordinary plastics or recycled plastics are: big smell, dark color, many burrs, easy aging and easy fracture of plastics. This will not only affect the service life, but also affect the drinking water hygiene.

4. Simple capacity identification method: the depth of the inner container is basically the same as the height of the outer shell, and the capacity (with a difference of 16-18mm) is in line with the nominal value. In order to cut corners and make up for the missing weight of materials, some domestic brands add sand and cement blocks to the cups. Myth: A heavier cup is not necessarily good.

5. Simple identification method of stainless steel materials: There are many specifications of stainless steel materials, among which 18/8 means that 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. The color of ordinary stainless steel cup is pale or dark. If it is soaked in 1% salt water for 24 hours, it will produce rust spots, and some elements contained in it will exceed the standard, which will directly endanger human health.

6. Appearance identification method of cups. Take a look at whether the surface polishing of the inner container and the outer container is uniform and consistent, and whether there are bumps and scratches; Second, see whether the welding of the mouth is smooth and consistent, which is related to whether it feels comfortable when drinking water; Third, check whether the internal seal is tight and whether the plug and the cup are matched; Look at the mouth of the cup, the rounder the better.

7. check the labels and other accessories of the cups. See if the product name, capacity, caliber, manufacturer's name and address, adopted standard number, use method and matters needing attention in use are indicated. Japan is a country that attaches importance to quality, and will clearly indicate the performance of its products in strict accordance with the requirements of relevant standards.

Besides, you should try to find rice grains online. Someone has already entered W for a month.