Can the insulation cup still be used if it has rust spots? This question is very good. Whether the insulation cup can still be used due to rust can be divided into two situations: first, the inner liner of the insulation cup is rusted, and second, the mouth, bottom, or outer shell of the insulation cup is rusted. If the inner liner is rusty, then this type of cup must not be used; If it is the second case, it can still be used in a short time, but the good thing is to replace it. Everyone knows that the insulation cup is made of stainless steel, why does it still rust?
Rust on the inner liner of the insulated cup: Rust on the inner liner can directly determine that the cup you purchased does not meet the national standard of "GB/T 29606-2013 Stainless Steel Vacuum Cup", which means that the material of the cup you purchased is fake. Because the inner liner of insulated cups produced according to national standards will definitely not rust unless you use insulated cups to hold acidic liquids.
Can the insulation cup still be used if it has rust spots? Why do insulated cups rust?
Rust on the mouth, bottom, or outer shell of the insulated cup: This phenomenon can be said to occur frequently because the outer shell of the insulated cup is made of 201 stainless steel, which can easily cause rust when in contact with acidic liquids or salt water. Because 201 stainless steel is prone to rusting and has poor corrosion resistance, its cost is relatively low. Any inexpensive product on the market is an insulated cup made of 304 inner liner and 201 outer shell material.
Tips for purchasing insulated cups
Just look at the steel seal on the inner liner of the insulation cup to see if there are words such as sus304, 18/8, and sus316. If there are any, go to the next step; The second is to look at the instructions and see if they indicate the manufacturer, place of origin, and other information; The third is the certificate of conformity; The cup with no buzzing sound on the fourth interlayer is not an insulated cup. Place the thermos cup at the ear, and no buzzing sound can be heard inside the thermos cup. This means that the cup is not a thermos cup at all, so such a cup will definitely not be insulated. As long as these four points are met, you can choose to purchase, at least to ensure that the inner liner does not rust and can drink healthy and safe water.
