Fluorek sodu. Synonyms: natrium bifluoratum (sour), sodium fluoratum (inert). Chemical symbols: NaF-HF (sour), NaF (inert). Neutral sodium fluoride is obtained by the action of concentrated sodium hydroxide solution (NaOH) to cryolite or by melting calcium fluoride with sodium sulfate. Acid sodium fluoride is obtained by supersaturating a neutral sodium fluoride solution with hydrofluoric acid, and then evaporating the solution until dry. The sodium fluoride is in the form of colorless crystals or white powder, sparingly soluble in cold water, It does not wind in the air, you are free, partially washable, does not corrode metals. It is somewhat poisonous in the impregnation process; suitable as a primer for paints. It is sometimes used to impregnate wood in residential buildings. Substitute materials can be: zinc fluorosilicate, “Fungol”, „Fluralsil”, dwunitrophenolan sodu, zinc chloride; ,Nitrol” i „Pasta B”-24° / o. The packaging is wooden barrels weighing approx 100 kg. Zinc fluorosilicate. It is a solid, crystalline, colorless, no smell, easily soluble in water, with high hygroscopicity. Corrodes metals strongly, works on fire retardant wood, suitable as a primer for paints. It is used for impregnating wood in residential and non-residential buildings and for removing mold wood.