What grades are the Silicone materials divided into? What category does the Silicone products you purchased belong to?
- By:Trade Hindi
Rubber is a kind of soft rubber material we all know, in many industrial environments can see it, and silicone and rubber so that many friends can not identify their differences, laymen often will be mistaken for silicone rubber material, and the real silicone material will be mistaken for latex material, so not to mention the grade of silicone and the difference, So people who know rubber and plastic materials know that silicone and rubber have many different levels and differences, such as natural rubber, butyl, chloroprene, fluorine rubber, and silicone also has levels, such as industrial grade, food grade, medical grade, you will distinguish their differences!
Silica gel in all soft colloid is one of the best performance of the material, it in all aspects of the characteristics are more comprehensive quality, so many industries have chosen to use it as the main body or spare parts, and food grade and ordinary grade is divided into gas phase and precipitation level, the difference between the two is the material of different compounds, the main body is basically the same.
For example, precipitated silica gel is mainly precipitated silica black. This silica black uses fuel gas at high temperature to prepare sodium silicate made of naphtha and soda ash into a dilute solution of high concentration. After adding certain compounds, it can be cleaned and crushed to get precipitated silica black. Add silicone oil, silica and other materials to obtain precipitated silicone rubber raw materials.
And the vapor phase silica gel this is the use of silicon tetrachloride combustion of silicon dioxide in the addition of silicone oil, silica black, siloxane and other substances to get the vapor phase silica gel material, also known as food grade silica gel, its high density, silicon molecular detail can be up to more than 1000 mesh, so the tensile resilience of the product, tear resistance is better than ordinary grade silica gel material, but the price is more expensive.
However, it is difficult for us to tell whether Silicone products are ordinary silicone material or food grade silicone material by naked eyes, so the only way is to use techniques to identify silicone products. For example, when producing stretch rebound, silicone products will appear as white mist on the surface of stretch point, which is quite obvious. The gas phase glue will not produce white mist phenomenon when stretched.
Secondly, in the combustion is the combustion of ordinary silica gel material will appear white smoke, but the powder particles after the product combustion belong to a relatively large and easy to crack, and the gas phase glue will also appear this phenomenon, but the combustion powder of food grade silica gel will be finer, and not easy to crack, the combustion time is longer than ordinary precipitation glue.
Therefore, when identifying Silicone products, it can be seen whether they belong to food grade or ordinary grade material by pulling on them by hand. Of course, it is not ordinary glue that fails to meet the safety and environmental protection requirements. Currently, food grade silicone materials are mainly used in places where there are more contact with skin in daily life, such as silicone kitchenware and silicone daily necessities. Silicone pacifiers, etc., and ordinary glue is usually used in electronic equipment, silicone seals, silicone gaskets and so on, so there are differences.