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Since indirect fire does not cause any harm to mineral wool, it is often used to protect against fire and isolate equipment from fire. Synthetic cotton wool with fire -resistant characteristics is indicated by the symbol “A”, a figure is added to the character from 1 to 7. The best indicators of cotton wool with “A1” labeling, Vata with the designation below “A2” does not exist, the designation “A7” is assigned cardboard or carpet coatings without special fire -fighting. Such a marking is characteristic of products that have come to our market from Europe, or which is imported there. If you compare the marking from domestic factories — manufacturers, “A1” is equal to the domestic “NG”, and the fiery class “F” is approximately equal to “G4”. It is very important that under the influence of temperature or fire, cotton wool does not change its appearance and does not spread.