Modified silica micro powder introduces the differences between different silica micro powders

1. Different sources of minerals

The different raw materials will directly affect a series of indicators of silicon powder, such as refractive index, shape, hardness, purity, hue, whiteness, etc. The differences in mines are important, but often overlooked by producers and users. Usually, manufacturers produce products according to the amount of silicon powder required by the user end. Often, a very small number of manufacturers will pay attention to issues such as high-temperature minerals, low-temperature minerals, alpha minerals, beta minerals, etc. Why, some imported products are so expensive and difficult to imitate, largely because we are not sure what kind of ore they are using and cannot produce products with the same function.

2. Different particle size distributions

325 mesh ball milling production and 325 mesh air flow milling production are both 325 mesh products: some use ball milling, while others use air flow milling; Some particle sizes are controlled as D97, while others are controlled as D90; Some say it's D97, while others say it's D50; Some distributions are relatively concentrated, while others are relatively scattered; Some powder products have coarse particles, while others do not have coarse particles.

3. Different shapes

At present, there are roughly two types of silicon micro powders on the market: spherical and irregular shapes (spherical and square).

4. The content of heavy metals is different from that of Fe

This is related to mining and production processes. Heavy metals are strictly controlled in terms of environmental regulations and must be strictly controlled, as this indicator directly affects the level of the product.

5. Iron content

It is also inseparable from the original ore. Iron basically exists in the form of iron oxide, which is red in color. Therefore, silicon micro powders with high iron content often have lower whiteness and a reddish yellow phase. There are many silicon micro powders with a content of 100-200ppm on the market, and products with a content above 300ppm are relatively poor. There are few manufacturers who can control it within 50-80ppm. Therefore, it is very important in mineral processing and impurity removal.

6. Whether to modify or activate

Activity and modification are the same meaning, and commonly used in the market are siloxanes to modify ordinary silica micro powders. After modification, silicon powder will improve its physical properties related to resin silicone oil, such as flowability, oil absorption value, and bulk density. Of course, the cost will also double. Therefore, whether to use active silica micro powder or ordinary silica micro powder depends on specific circumstances.

7. Different uses

There are currently too many fields where silicon micro powder can be used. Plastic, silicone fluororubber, coating ink, fiber, ceramic board, flame retardant and refractory materials, adhesive, casting gypsum powder. In areas where different indicators are required, different specifications of silicon micro powder are needed.