What is the difference between Silica gel and TPE after all?

- 2021-07-27-

Silica gel is a thermosetting elastomer, has the advantages of safety and non-toxic, insoluble in water and any solvent, non-toxic and tasteless, chemical stability, in addition to strong alkali, hydrofluoric acid does not react with any substance, high adsorption performance, good thermal stability, chemical stability, widely used in adult products, food products.
TPE is a kind of thermoplastic elastomer, with environmental protection, non-toxic, easy to color, feel smooth and soft, hardness range 0A-120A, simple processing and forming, do not need vulcanization processing, can be recycled, reduce the cost. It can be coated with PP, PE, PC, PS, ABS and other plastic materials (secondary injection), and can also be molded separately.
I am 100 percent sure that some people will be stingy, said that since the silicone material is non-toxic and tasteless, how many of your products are silicone material, how I get the hand or have a great smell, not necessarily you cheat consumers? I can only say that you think is too naive, now what is pure materials, as are adding tungsten steel elements made of tungsten steel, add silicon, silicon steel made better ductility, each manufacturer is using silica gel as a basic material, in order to meet their requirement of softness, elasticity, design requirements, will add some other formula to carry on the synthesis, So the toy you're holding isn't 100% silicone, it's synthetic.

Two, TPE and silicone difference:

1, TPE is a variety of normal temperature with rubber elasticity, high temperature can melt flow of elastomer materials. Silica gel is a kind of special rubber, crosslinking has good mechanical strength, wear resistance and high temperature resistance, it belongs to thermosetting rubber, after vulcanization heating will not melt, the temperature is too high will burn, complete combustion products for water and silica.

2. They are different in the analytical structure: silica gel is the elastic body connected by the main chain silicon oxygen bond, and the side chain is generally methyl, namely CH3. TPE is a thermoplastic elastomer, consisting of styrene, olefin and polyurethane. The main difference between the two molecular structures is that one is SI02 structure and the other is CC structure.

3, from the processing performance: silica gel needs to be vulcanized heating molding, TPE does not need to be vulcanized can be processed and formed. Silica gel processing molding is difficult, and TPE production and processing is simple.

4, silica gel has advantages over TPE in high temperature resistance. Silica gel temperature resistance is generally between 200 degrees ~300 degrees, and TPE theory generally TPE high temperature resistance between 130 to 150 degrees Celsius, the higher the aging cracking.

5, the price of silica gel is generally more than 30,000 pieces a ton, and the general TPE price is between 13,000-30,000, TPE price more advantage, in addition to special TPE materials, such as halogen free flame retardant, food grade and so on.

6. From the cost point of view, the waste of silica gel can not be recycled, TPE waste, nozzle material, leftover material and so on can be completely recycled, TPE can save more cost.