What are the standards for qualified stainless steel thermos cups?
First of all, before the stainless steel thermos cup leaves the factory, it must be confirmed that the material is qualified. The most critical test to test whether the material is qualified is the salt spray test. Through the salt spray test, it is judged whether the material meets the standard? Will it rust after long-term use?
In the water glass industry for so long, it can be said that no matter how good the workmanship of the water glass is or how long the insulation performance is, as long as the material is not suitable or different from the material indicated on the manual, it means that this water glass is a substandard product. For example: use 201 stainless steel to pretend to be 304 stainless steel, put 316 stainless steel symbols on the bottom of the water cup, pretend that the inner tank is made of 316 stainless steel, but actually only the bottom is 316 stainless steel, etc.
Secondly, the tightness of the water cup. In addition to professional testing tools for airtightness, the factory will adopt a sampling inspection method. When the water cup is full of water, cover it tightly and turn it upside down for half an hour, then pick it up to check for water leakage. Then turn the water glass upside down and shake it violently up and down 200 times, and check again whether the water glass is leaking.
