Silica powder, why is the price of spherical powder so expensive?
Silica powder can be divided into angular silica powder and spherical silica powder according to particle shape, and angular silica powder can be divided into crystalline silica powder and fused silica powder according to different types of raw materials.
Crystalline silica powder is a silica powder material made of quartz block, quartz sand, etc., after grinding, precision grading, impurity removal and other processes. Physical properties such as linear expansion coefficient and electrical properties of the product.
Fused silica powder is made of fused silica, glass and other materials as the main raw materials, and is produced through grinding, precision grading and impurity removal processes, and its performance is significantly better than that of crystalline silica powder.
Spherical silica powder is made of selected angular silica powder as raw material and processed into spherical silica powder material by flame method. It has excellent characteristics such as good fluidity, low stress, small specific surface area and high bulk density. It is a downstream high-end product. s Choice.
As a filling material, spherical silica powder has better performance and better effect than crystalline silica powder and fused silica powder; the higher filling rate can significantly reduce the linear expansion coefficient of copper clad laminates and epoxy molding compounds, and the expansion performance is close to that of single crystalline silicon, thereby improving the reliability of electronic products; the epoxy molding compound using spherical silicon micropowder has low stress concentration and high strength, and is more suitable for semiconductor chip packaging; it has better fluidity and can significantly reduce the wear and tear on equipment and molds. Therefore, spherical silica powder is widely used in high-end PCB boards, epoxy molding compounds for large-scale integrated circuits, high-end coatings, and special ceramics.
The price of easy-to-use products is naturally high. The unit price and gross profit margin of spherical silica powder in the market are higher than those of crystalline and fused silica powder.