How to choose a thermos cup?

Look at the logo

The first and most crucial step when choosing a thermos is to carefully check the material label on the inner container.

The safety bottom line is to choose products clearly labeled with "SUS304" or "304". 304 stainless steel is internationally recognized as food grade steel, and its nickel chromium content (18% chromium, 8% nickel) can effectively resist acid and alkali corrosion, ensuring the safety and stability when storing regular beverages.

A better choice is "SUS316". 316 stainless steel adds molybdenum element on the basis of 304, which has better corrosion resistance and high temperature resistance.

The stainless steel material of the thermos cup should comply with the "National Food Safety Standard for Metal Materials and Products in Contact with Food" (GB 4806.9-2023), which specifies the indicators for heavy metal content and migration.

For safety reasons, we firmly prohibit products without labeling or labeled as "201". If there is no material label on the cup body, or if the merchant only vaguely claims "stainless steel", be sure to inquire about the specific model.

Products without labeling or labeled as "201" are not recommended for purchase, regardless of their low price. (Note: Some qualified products may be labeled on the packaging or instructions, please pay attention to checking the complete packaging information.)

Smell the Odor

The smell after opening the lid of a new cup is a direct reflection of the craftsmanship and accessory materials. A qualified stainless steel cup body should have no odor (such as plastic smell, rubber smell, chemical smell). The odor usually comes from non-metallic components such as cup lids and seals that use inferior recycled plastic or rubber. This is not just a matter of experience, but may also mean the release of harmful substances.

If conditions permit, you can open it and smell it before purchasing. After online shopping and receiving goods, this step should also be checked first.

Touch the material

Touching the cup mouth and inner liner, a well crafted insulated cup should be smooth, free of burrs and defects. Rough workmanship often means that the overall quality control is not strict.

Choose brand and channel

Priority should be given to well-known brands with long-term reputation in the field of insulated vessels. They are usually more stringent in material traceability, process control, and safety testing.

It is recommended to purchase from large formal shopping malls, supermarkets, official brand flagship stores, or authorized distributors. The source of goods and after-sales service through these channels are more guaranteed.

We must remain highly vigilant towards products with prices far below the market average, simple packaging, and incomplete product information (such as manufacturers, material specifications, and certificates of conformity).

Even when using 304/316 thermos cups, it is recommended to avoid holding the following beverages for extended periods of time to prolong their lifespan and ensure safety:

① Acidic drinks: fruit juice (such as orange juice), carbonated drinks.

② Alkaline beverages: Some functional beverages.

③ High tannin beverages: strong tea, wine, etc.

④ Dairy products: milk, soybean milk （easy to deteriorate）.

⑤ Soup with high salt content.

If it is necessary to serve the above drinks, it is best to shorten the serving time and thoroughly clean them in a timely manner.

Alright, I hope this detailed "thermos cup selection guide" can help everyone choose the desired and safe thermos cup!