In terms of material, thermal insulation products are divided into glass vacuum thermal insulation container and stainless steel vacuum thermal insulation container. The former commonly includes thermos, thermal insulation lunch box, glass liner thermal insulation cup, etc. And the latter is mainly stainless steel thermal flask.
Whether small mouth, large mouth, portable, desk type or seat type, the purchase methods are similar, and the specific products are slightly flexible according to the specific situation. Then, the following identification methods can be used when purchasing stainless steel thermal flask:
1. Simple identification method of thermal insulation performance of stainless steel thermal flask
Pour boiling water into the stainless steel thermal flask, tighten the stopper or lid, and touch the outer surface of the cup body with your hand after 2-3 minutes. If the cup body has obvious warming phenomenon, especially the lower part of the cup body is hot, it indicates that the product has lost vacuum and can not achieve good thermal insulation effect, but the lower part of the insulated cup is always cool.
Misunderstanding: some people use their ears to determine whether there is a sizzling sound to determine their thermal insulation performance. But ears can't tell whether there is a vacuum.
2. Identification method of sealing performance of stainless steel thermal flask
After adding water to the stainless steel thermal flask, tighten the bottle stopper or cup cover clockwise, and place the cup flat on the table without water seepage; The screw in and screw out of the cup cover and cup mouth shall be flexible without gap. Fill a glass of water and turn it upside down for four or five minutes, or toss it hard to verify whether there is water leakage.
3. Identification method of plastic parts of stainless steel thermal flask
Food grade new plastic features: little smell, bright surface, no burr, long service life, not easy to aging.
Characteristics of ordinary plastics or recycled plastics: strong smell, gray color, many burrs, easy aging and fracture of plastics. This will not only affect the service life, but also affect the drinking hygiene.
4. A simple method to identify the capacity of stainless steel thermal flask
The depth of the liner is basically consistent with the height of the shell (the difference is 16-18mm) and the capacity is consistent with the nominal value. In order to cheat on materials and make up for the weight of missing materials, some brands add sand and cement blocks to the stainless steel thermal flask.
Misunderstanding: a heavy cup is not necessarily good.
5. Simple material identification method of stainless steel thermal flask
Model 304 - general model; 18/8 stainless steel. The GB brand is 0Cr18Ni9.
Model 309 - has better temperature resistance than 304.
Model 316 - the second most widely used steel after 304, which is mainly used in food industry and surgical equipment. Molybdenum is added to obtain a special corrosion-resistant structure. Because it has better chloride corrosion resistance, it is also used as "hull steel". SS316 is usually used in nuclear fuel recycling units. Grade 18/10 stainless steel generally meets this application grade.
6. Appearance identification method of stainless steel thermal flask
I. check whether the inner and outer surfaces are polished evenly and uniformly, and whether there are bumps and scratches;
II. Second, see whether the mouth welding is smooth and consistent, which is related to the feeling of comfort when drinking water;
III. check whether the internal seal is tight and whether the screw plug and cup body match;
IV. Look at the mouth of the cup. A regular circle is better.
7. Check the label and other accessories of stainless steel thermal flask
Check whether the product name, capacity, caliber, manufacturer name and address, adopted standard number, use method and precautions in use are indicated. A manufacturer who attaches importance to quality will strictly follow the requirements of relevant national standards and express its product performance.