Thick-walled aluminosilicate microsphere is a new, promising filler with a combination of useful properties - hollow thick-walled silicate microsphere with bulk density 0.7 - 0.9 g/cm3 and specific gravity 2 - 2.2 g/cm3 (photo). The technology of its production is the purification of raw materials from magnetite, coke and unburned coal, further classification into fractions with specified particle sizes. The combination of unique properties and the ability of INOTECK Group of Companies to produce it in industrial quantities (more than 1000 tons and raw material reserves in Russia) makes unlimited possibilities and prospects for the use of thick-walled aluminosilicate microspheres in oil, gas, chemical industry, automotive industry, in the production of refractory ceramics and in construction. The spherical shape is ideal for the filler because the microsphere is a loose material, has a high flowability and ensures compact placement. At high concentrations, the spheres are compacted, but no further compaction occurs, as can happen with irregularly shaped fillers. Thus, the use of spheres reduces curing shrinkage, which is very important in the production of mastics for sealing cracks and joints, sealants, etc. Spherical filler can be easily sprayed, gravity fed, pumped or pneumatically conveyed. Due to its spherical shape, the microsphere is easy to paint. Low hygroscopicity and water absorption of thick-walled aluminosilicate microsphere are taken into account when calculating moisture insulation, assessing the durability of structures, as well as when determining storage and transportation conditions. High frost resistance characterizes the ability of the material to withstand cyclic loads occurring at the transition through 0°C. In the construction industry, aluminosilicate microsphere is used as a filler in: inorganic building materials, lightweight construction materials and ultra-lightweight concrete, wall blocks, dry building mixtures, lime mortars, cement, plaster, high-strength wear-resistant flooring for industrial spaces, paint, insulating roofing and soundproofing materials, finishing and plastering gypsum for insulation of external walls of buildings, sound and heat insulating coatings, decorative materials, as well as for mastics for sealing cracks and joints, putties, sealants, etc.