Is stainless steel 304 food grade
It depends on the situation, not all stainless steel 304 is food grade.
1. Food grade 304 stainless steel is a stainless steel grade produced according to the American ASTM standard, depending on whether it is labeled as food grade.
2. Under normal circumstances, ordinary stainless steel 304 cannot meet the relevant qualification standards for food grade stainless steel. If there are no special symbols and words such as food grade on the surface of stainless steel 304, it indicates that it is not food grade.
Due to the high lead and manganese content of ordinary stainless steel 30, while food grade stainless steel is generally strictly prohibited from exceeding the content, otherwise food safety will not be guaranteed. To achieve food grade stainless steel 304, it is necessary to strictly control the content of arsenic, cadmium, nickel and other metals in the production process.
How to determine whether 304 is food grade
1. Check the mark: Check if there is no SUS304 mark on the surface of the product, and then check the material content, testing report, etc. in the product manual to prove that the material belongs to food grade material. If not, prove that it is made of ordinary 304 or other materials. If used for consumption, be cautious when choosing, as 304 material is much more expensive than other materials in the market.
2. Testing with reagents: There are professional reagents available in the market for detecting metal materials, and the methods are very simple. You can drop the reagent onto the product and let it stand for 3 minutes. If the color shows peacock green, it is an edible grade 304 material.
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 the salt spray test. If it quickly rusts, it can be proven that non genuine food grade 304 can achieve 48 hours of salt spray test without rusting.