Whether 304 Stainless Steel Is Food Grade

Look at the mark: check if there is no SUS304 mark on the surface of the product, and then look at the material content and test report in the product manual to prove that the material belongs to food-grade material. If not, it proves that it is made of ordinary 304 stainless steel or other materials. of. If it is used for food, be careful when choosing, after all, 304 materials are much more expensive than other materials in the market.

2. Detection with reagents: There are professional reagents for detecting metal materials on the market, and the method is very simple. You can drop the reagent on the product and let it stand for 3 minutes. If the color appears malachite green, it is food grade 304 stainless steel.

3. Salt spray test: Food grade 304 stainless steel has the characteristics of corrosion resistance, acid and alkali resistance. It is recommended to verify the product according to the operation steps of salt spray test. If it rusts quickly, it proves that it is not real food grade 304 stainless steel. Do the salt spray test for 48 hours without rust.