If there is rust in the insulation cup, there are several possible factors:
1, the use of stainless steel material corrosion rust, may be because the factory selection is unreasonable, that is, insulation cup manufacturers for its product use and selection of unsuitable stainless steel grades to do raw materials.
2, may also be manufacturers of production and processing technology does not pass. 3, or because the cup manufacturers do choose the market does not meet the relevant national or industry authority standards of shoddy stainless steel raw materials.
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