What Material is the Liner of the Vacuum Insulated Cup? How to Choose?

Vacuum insulated cup generally refers to stainless steel vacuum insulated cup. The material is austenitic 304 stainless steel that meets national standards. Of course, in addition to 304 stainless steel, there are also 316 stainless steel and 201 stainless steel.

Among these three types of stainless steel, 201 stainless steel does not meet the standard of vacuum insulated cup liner, but some black-hearted merchants choose 201 stainless steel as the thermos cup liner, and use shoddy to fight price wars in the vacuum insulated cup market, disrupting the market price system. Therefore, consumers must recognize the material of the inner liner of the vacuum thermos when purchasing, otherwise it will cause harm to the human body.

1. The material of the inner liner and outer shell of the vacuum insulated cup

There are three kinds of stainless steel materials. Only 304 stainless steel and 316 stainless steel can meet the national standards for the inner tank of the vacuum flask, and 201 stainless steel does not meet the standard, but these three types of stainless steel are acceptable for the outer shell of the vacuum flask.

Vacuum insulation was invented in Japan in the late 1970s, and it was a revolution in the production of insulation utensils. The principle of vacuum insulation is applied to the manufacture of vacuum insulated cups, stainless steel is used as the main raw material, and the vacuum formed in the inner and outer double cup walls is used to block the heat transfer inside and outside the container, so the temperature in the container can be maintained for a long time.

2. The purchase skills of vacuum insulated cup

There are so many vacuum insulated cup manufacturers, not to mention the products of vacuum insulated cup. As a consumer, how do you choose a suitable or high-quality vacuum insulated cup from these massive products? We analyze the purchasing skills of vacuum insulated cups from the following points:

First look at the label or manual of the vacuum insulated cup to determine whether the manufacturer is a regular enterprise.

Secondly, check from the appearance of the vacuum insulated cup to see whether the surface of the inner tank and the outer tank is uniformly polished, and whether there are bumps, scratches or burrs; see whether the welding of the mouth is smooth and consistent, which is related to whether the feeling of drinking water is comfortable; Check whether the internal seal is tight, whether the screw plug and the cup body match; Look at the mouth of the cup, the rounder the better, and the immature process will be out of round.

Finally, check the airtightness of the vacuum flask, first twist off the lid to see if the lid fits the body of the cup, then add boiling water (preferably boiling water) to the cup, and then turn the cup upside down for two to three minutes to see if water seeps out.