The difference between precipitated silica and fumed silica
For white carbon black, the most important thing is its "reinforcing" effect. If it is used for the high-temperature sealing ring on the rocket, the high-temperature and tear resistance will be doubled; Plastic steel door and window seals commonly used in home decoration will become more tenacious with its "joining"; It can reduce the rolling resistance of tire and improve its wet skid resistance.
There are two main kinds of silica,what is the differences between precipitated silica?
Classification | Precipitated silica | Fumed silica |
Manufacturing method and raw materials | Sodium silicate and sulfuric acid are usually used, and the reaction is carried out in liquid-solid phase. | Silicon tetrachloride, hydrogen and oxygen are usually used for high-temperature combustion reaction in the gas-solid phase. |
Main technical indicators | Content 98%, water content 4-8%, ignition loss ≤ 7%, specific surface area 100-200m2 / g, pH value 5-8. | Purity above 99.8% and water content less than 1% (collectively referred to as anhydrous silica). |
Cost and uses | The raw material cost is low and the production process is easy to control. It is widely used in rubber, tire, shoe making, toothpaste, feed, paint and other industries. | The investment in environmental protection facilities is large and the preparation process is complex. The products are mainly used in RTV, HTV silica gel products, toner, paint and other industries. |
Price | The product is cheap | The product price is high |
Price development trend | The product has obvious price advantages, accounting for more than 90% in the domestic market. | The application field is different from that of precipitated silica, with a share of less than 10%. |