Abstract: The invention is referred to chemical technology, namely to active high-purity magnesium oxide and its production method. Active high-purity magnesium oxide, including the surface treated one, has BET specific surface area from 70 to 200 m2/g, average particle size (d50) determined by laser diffraction method not more than 10 microns, iodine activity in the range from 70 to 200 mg J/g MgO, citric activity not more than 40 s, pore volume in the range from 3.2×10?2 cm3/g to 10.2×10?2 cm3/g, diameter of 10% of the particles not more than 2 microns, diameter of 90% of the particles not more than 30 microns, mass fraction of residue on the 150 micron sieve not more than 1%, mass fraction of residue on the 45 micron sieve not more than 2%, mass fraction of chlorides not more than 0.1%, mass fraction of calcium not more than 0.1%, mass fraction of substances insoluble in hydrochloric acid not more than 0.05%, mass fraction of iron not more than 0.

Abstract: The invention relates to chemical technologies, specifically nanoparticles of flame retardant magnesium hydroxide, and a process for the preparation thereof. The present nanoparticles of flame retardant magnesium hydroxide, including surface-processed nanoparticles, have a hexagonal plate-like structure with a specific surface area of up to 20 m2/g, an average diameter of the secondary particles of up to 2 ?m, a diameter of 10% of the secondary particles of up to 0.8 ?m, a diameter of 90% of the secondary particles of up to 5 ?m, with a longitudinal size of the primary particles of from 150 to 900 nm, and a thickness of from 15 to 150 nm.

Abstract: The invention relates to chemical technologies, specifically nanoparticles of flame retardant magnesium hydroxide, and a process for the preparation thereof. The present nanoparticles of flame retardant magnesium hydroxide, including surface-processed nanoparticles, have a hexagonal plate-like structure with a specific surface area of up to 20 m2/g, an average diameter of the secondary particles of up to 2 ?m, a diameter of 10% of the secondary particles of up to 0.8 ?m, a diameter of 90% of the secondary particles of up to 5 ?m, with a longitudinal size of the primary particles of from 150 to 900 nm, and a thickness of from 15 to 150 nm.