Does the thermos still work if it’s rusty? That’s a very good question. Vacuum cup rust can also be used in two cases: one is the vacuum cup liner rust, the other is the insulation cup mouth, bottom or cup body shell rust. If it is the inner rust, then this cup must not be used; If it’s the second case, you can still use it for a short time, but the good thing is to change it. Everyone knows that thermos is made of stainless steel. Why does it rust?
Why do thermos rust?
Vacuum cup inner rust: inner rust can directly determine that the cup you buy does not reach the national standard GB/T 29606-2013 stainless steel vacuum cup, which means that the cup material you buy is false. Because according to the national standard production of vacuum cup liner will not rust, unless you use the vacuum cup to hold acid liquid.
Rust at the mouth, bottom or body of the thermal insulation cup: this phenomenon can often happen, because the outer shell of the thermal insulation cup is made of 201 stainless steel, which is easy to rust when exposed to acidic liquid or salt water. Because 201 stainless steel is easy to rust and has poor corrosion resistance, its cost is relatively low. As long as the product is cheap in the market, it is a vacuum cup made of 304 inner shell and 201 material.
