Natural amorphous silica filler products featuring high brightness, low oil absorption, fine particle size, and low crystalline silica content are described. Methods for making, using, and measuring the properties of the natural amorphous silica filler products are also described. The natural amorphous silica filler products described herein may be useful in a variety of products including, but not limited to, polymers, sealants, paints, caulks, latex, architectural coatings, industrial coatings, pozzolan, glass catalysts, ceramic glazes, and anti-blocking applications.

The present invention relates to an inorganic particulate material suitable for use in polymeric films, compositions such as polymeric films comprising the inorganic particulate materials, methods of making said compositions and the various uses of the inorganic particulate materials and compositions.

A method of purifying a particle is disclosed and includes a plurality of following steps: preparing a purification solution; fully mixing a mixed solution to be purified with the purification solution, and letting stand until a plurality of separated layers appear, removing a layer of liquid where a second purification solution is located, and extracting a layer of liquid where a first purification solution is located; and freezing and drying the extracted layer of liquid to obtain a purified particle.

The present invention relates to an inorganic particulate material suitable for use in polymeric films, compositions such as polymeric films comprising the inorganic particulate materials, methods of making said compositions and the various uses of the inorganic particulate materials and compositions.

The present application relates to the technical field of electrophoretic particles, more particularly to an electrophoretic particle, a preparation method therefor, and an application thereof. The electrophoretic particle includes a shell layer and a core layer, which is wrapped in the shell layer. The core layer includes a plurality of core particles, and the density of the core particles is lower than a density of the shell layer. The structure of the plurality of the core particles makes the shell layer wrapping on surfaces of the plurality of the core particles form a folded structure, thus increasing a surface area of the core layer and improving the bonding tightness between the shell layer and the core layer, and making the shell layer of the resulting electrophoretic particle have relatively strong tightness.

The present invention relates to a silica particle dispersion including spherical silica particles and a solvent, in which the spherical silica particles have a median diameter d50 of 0.5 m to 20 m, and a product Ad50 of 2.7 m.Math.m.sup.2/g to 5.0 m.Math.m.sup.2/g, the product Ad50 being a product of a specific surface area A (m.sup.2/g) of the spherical silica particles and the median diameter d50 (m).

Methods and compositions utilize a sand obtained by combining a dirty sand with a chemical additive, where the combination decreases the water drain time through the sand compared to the sand without the chemical additive. The decrease of water drain time reduces the amount of time to dry the sand after a wash, and when using the sand for proppant, promotes conductivity of fluid through the sand when the sand is in a fracture of a subterranean formation.