Silica gel science knowledge Pu (III)-HongYe silic...

Explanation of the above posts, we have some understanding of the concept of silicone, silicone rubber and some words. Today, our food-grade silicone rubber to make a simple introduction. "Food Grade" is a vague word, I searched the Internet for a long time but could not find enough information on the definition of the word. As I understand it, the food grade is that you can come into contact with food but will not affect the quality of food, and not a harmful standard. But this argument is too general, the judgment of a material is the need to this material through the food grade safety regulations prescribed tests are not food grade.     In accordance with U.S. FDA requirements the Silastic come into contact with food products must meet the following three conditions:     (1) does not release the ingredients pose a risk to human health.     This requires that the product itself does not contain toxic substances, and products will have a sufficiently stable chemical properties, not by natural oxidation corrosion. (2) can not lead to the composition of the food can not accept change. The products can not contact with things that a chemical reaction, the composition of the product itself can not come into contact with food changes.     Not reduce the food sensory characteristics (taste, odor, color change of the food) The above three conditions are emphasizing the chemical stability of the food-grade silicone rubber, when we understand the need to consider the stability of the impact of different environments on silicone rubber. In order to test food-grade appliances meet the above three conditions, the product of several aspects of the test. Testing standards of the countries in the world is slightly different, such as Germany LFGB standard of silicone rubber products for the following tests: (1) the three overall migration test; ② (VOCs) volatile organic compounds intended to amount; ③ peroxide value test; ④ organotin compounds tested; ⑤ sensory test.     The tested products can be marked with knife and fork-shaped food safety signs. The most common food-grade test specifications: U.S. FDA, U.S. Food and Drug Administration (FDA) U.S. Food and Drug Control Board; Germany LFGB, food, tobacco products, cosmetics and other daily necessities Management Act EU standards EU. When we mention the food-grade XX to be clarified by which the specification test.