Special stearic acid for rubber softener

含量：

99

外观：

白色

包装：

25公斤

It would be better to have a detailed breakdown. First, stearic acid is not divided into rubber grade and food grade~~~ I don’t know where you have seen that stearic acid has a qualification certificate for food. If so, let me learn from it.
Stearic acid is divided into primary, secondary and tertiary acids. The primary acid is also called cosmetic grade stearic acid. The tertiary acid is rubber grade stearic acid. The one in between is secondary acid. If it is sour, first-grade stearic acid can be used in the food industry, such as Span, but there is no relevant national or international certification. It is said that some institutions are working on this. Then I will explain to you the question about the code name. The code name is just a name and does not have much meaning. The front one means first-level acid, and the last one means first-level acid. However, Shuangma and Yihai are special, they are third-level acid, which are generally imported from abroad. Primary acid, of course not all primary acids are called, for example. The last one you mentioned is Yihai’s primary acid. The secondary acid is between the two and is used by customers who don’t have very high quality requirements, such as mid-range hard salt.
If you want to know specifically what kind of stearic acid you need, the best way is to ask for a sample to be tested. Once it passes the test, you can use it. I have imported samples of various models with various names and different quality levels. , so many things can only be learned after encountering them slowly, and you can't hear or explain them clearly at once.
It seems that there is still an unanswered question, what is the difference between primary acid and tertiary acid? The difference between them is superficially color and smell, and then the nature is iodine value and other insoluble matter, etc., because their properties determine , their application areas and prices are different.
I don’t know if there is a systematic definition of these levels. Some customers told me that they want food-grade or pharmaceutical-grade stearic acid. So I want to know how to distinguish these stearic acids in food, medicine, rubber and so on. The sample you mentioned can certainly be used to determine whether it is applicable. However, various models currently on the market should have relatively fixed index parameters. It should be clear which models of mainstream products are suitable for which industries
I know that stearic acid is used in the food industry and is used in Span There are some other places where it is possible, but I currently don’t have similar customers in the pharmaceutical industry. Also, stearic acid does not have a food addition license or food license, so there is no need for a drug certificate.
There are still many mainstream models. Generally, the ones imported from abroad are the best and can be used in almost all fields where stearic acid can be used. But if you ask them to provide proof of relevant food and medicine, it will be more difficult. I keep emphasizing this issue. Recently, the country has indeed been stricter on food and medicine. If you be cautious, there will definitely be no problem in using it. , but please note
It means that the country does not have relevant standards, and what is available now is just a term that has been agreed upon in the industry. Does this mean?
There is no national standard for stearic acid, there is only an international standard for stearic acid with small particle size