The invention relates to a composite material containing 5 to 97 % vol. aerogel particles, at least one binder and at least one fibrous material, in which the diameter of the aerogel particle ≥ 0.5 mm, a process for its production and its use.

The particle diameter of the particles (50) is, for example, 10-200 nm.

The particles are preferably smaller than 30 microns diameter.

The diameter of particles shall be  20 nm, and for at least 95 % by number it shall be  40 nm.

The method permits the production of fine polymer particles or fine coating particles having a controlled average particle diameter.

Th e diameter of particles shall be  20 nm, and for at least 95 % by number it shall be  40 nm.

The oxide superconducting thin film (2) wherein the particle diameter of the nano fine particles (3) is 5-100 nm.

The resultant particles are porous particles having a micron order size, are porous, have a narrow particle diameter distribution, and are mono-disperse.

Preferably, the solid particles have a diameter of less than about 40 microns.

The diameter of the powder particles may lie in the nanometre range.

The variation coefficient of the diameter of the particles is 10-100%.

Resin microparticles as a raw material for toner that have a small particle diameter and a narrow particle diameter distribution, having low odor.

The colloidal particles have a particle diameter at least one time the particle diameter of the particles of the optical semiconductor, and the optical semiconductor particles account for 0.1 to 10% by weight of the whole coating material.

The diameters of the spherical metallic particles and metallic oxide are 300 microns or less.

The size-reduced rubber particles are classified according to particle diameters in a sieving machine (16).