cristobalite flour manufacturer

Cristobalite Silica Powder

Cristobalite powder is made of selected vein quartz ore heated at high temperature starting at about 1500°C, processed by non-polluting grinding, magnetic separation, and classification. With high purity and white color, cristobalite silica powder has stable physical and chemical properties and controllable particle size distribution is widely used as material for the epoxy potting compound, epoxy mold compound of the electronic and electronic appliance industry, as well as casting, engineering plastic, silicone rubber, precision ceramics, and high-grade painting, etc.

The properties are stable, the silicon content is over 99.8%, the crystalline phase is tetragonal, the hardness is about 6.5, the density is 2.45, large specific surface, high porosity, good weather resistance, good precipitation resistance, good thermal shock resistance. The color of cristobalite flour is much white. It is widely used in the fields of high-tech electronic materials, high-grade paints, silicone rubber, special ceramic, etc.

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Cristobalite Main Features

The properties are stable, the silicon content is over 99.8%, the crystalline phase is tetragonal, the hardness is about 6.5, the density is 2.45, large specific surface, high porosity, good weather resistance, good precipitation resistance, good thermal shock resistance.

  • Excellent Optical Properties
    The refractive index of cristobalite decreases from 1.55 to 1.48, which is closer to that of PE, PP, and some resins. The blended resin is transparent and does not cover the color of the pigment itself while filling with other fillers will make the color of the pigment lighter and distorted.
  • High reflectivity
    The concrete structure of cristobalite can help light reflection and replace glass beads as reflective paint. It can not only enhance the anti-skid property, but also improve the reflectivity of paint.
  • High whiteness, low density and bright color
    The whiteness of cristobalite is over 95%. It can replace part of titanium dioxide and reduce the cost of formulation when used in coatings and paints.
  • Corrosion resistance
    Corrosion resistance, scratch resistance and scrubbing resistance.
  • UV-resistance and good insulation
    It does not contain organic pollution and has very low metal content. It can enhance the UV resistance of the coating and has good insulation.
  • Excellent thermal shock resistance
    When quartz is heated at 220 – 240 C, a certain degree of thermal expansion occurs, which compensates for the shrinkage of epoxy resin and gypsum during curing reaction at this temperature, so that the casting body does not deform.

Cristobalite Applications

It is used in jewelry casting, precision casting, dental materials, electronic chip polishing, polishing materials, building interior and exterior wall coatings, road reflective coatings, automotive primers, plastics, rubber, silicone rubber, adhesives, national defense, and other fields.

  • Application of cristobalite in adhesives It has low oil absorption value, basically no edges and corners, low viscosity relative to white carbon black, stronger weathering property than white carbon black (white carbon black is alkaline), good bonding effect ( rough surface), good peel strength, high pull-out strength, and high surface resistance. After modification, it can be better combined with an epoxy resin system to eliminate bubbles and settlement. A suitable proportion of diatomite can be added to the formulation so as to better improve the adhesion. The silicon powder has many joint surfaces, obvious edges and corners, and difficult to bond. Kaolin is a hexagonal flake, red after burning, and has many joints (not easy to bond).
  • Modified quartz powder is usually used as an anti-caking material for transparent PP and PE, LDPE, LLPDE. In film production, because quartz has the same refractive index, for most polyolefin films, this additive has little effect on the optical properties of films. Other special applications include ultrathin films and double extrusion films, which require ultrafine quartz powders. 600 mesh quartz powder is usually used as an IR absorption material in a greenhouse film.
  • Cristobalite powder has high surface energy, hydrophilic and oleophobic surface, easy agglomeration. It is difficult to disperse evenly in non-polar or weakly polar paints. Therefore, it is necessary to modify the surface of ultrafine powder so that the surface of quartz particles can be coated with a layer of organic substances (such as coupling agents, surfactants, etc.) to make it oleophobic and hydrophilic to oleophilic and This not only enhances the compatibility and binding force between quartz powder and matrix/substrate but also enhances the dispersion of quartz.

Packing and Delivery

  • Package details: A woven bag of 25kg net each bag, then 1000kg each bag, 20-25mt/1×20 container. You can also customize your package.
  • Delivery Time: 3-20 days after confirming the order, a detailed delivery date should be decided according to production season and order quantity.

Cristobalite Powder Manufacturer

MiningValleys is based on a leading silica powder and quartz sand manufacture in China. Our company has been dedicated to providing quartz mineral-related products for over 10 years. We’ve built a production line of high-purity and soft silica powder production line with an annual output of 12,000 tons.

Having been certified by ISO 9001, ISO 14001, OHSAS 18001 high-quality standard, our silica powder, and quartz sand products are sold to more than 20 provinces and regions in China and exported to Asia, Europe, America, Africa, etc.

We appreciate your needs and hope to build a friendly business relationship with clients and customers from around the world.

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