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1. Q: Why did the stainless steel headbands we purchased rust extensively?

A: Extensive rusting of stainless steel headbands is usually caused by unqualified materials. This means the content of chromium and nickel for rust protection is seriously below the standard. For example, SUS201 is used instead of the required SUS301.

2. Q: How to identify SUS301 or SUS201?

A: You can send the headbands to a third-party testing company to measure the nickel content. It is SUS201 if the nickel content is less than 2%, approximately 6% for SUS301, and about 8% for SUS304. A rough judgment can also be made based on magnetism: SUS201 is strongly magnetic, while SUS301 and SUS304 are weakly magnetic, which is quite different from SUS201.

3. Q: The test confirms it is SUS301, so why is there still slight rust?

A: First, acidic cleaning agents may remain on the material surface during headband production, especially at material defects such as pinholes and blisters. Inadequate rinsing will lead to slight rusting. Second, insufficient reflection at pinholes or blisters may be visually judged as rust. However, both types of “rust” are generally very minor and small.

4. Q: Why can’t we completely eliminate surface rust on the headbands?

A: All materials contain more or less impurities, differing only in quantity. Impurities create pits and voids, which show insufficient reflection and are regarded as rust (this accounts for most cases). Therefore, it is impossible to completely eliminate such so-called rust.