Ceramic loose fibers (L-3 wool) are used for:

• filling unevenness, cavities, scratches and cracks in traditional refractory lining
• filling expansion gaps in walls and ceilings
• sealing of burner fittings, sight glasses, roller fittings, etc.
• performing compacted thermal insulation in furnaces of various types
• the lining of the hood in the stove in the hood
• filtering hot gas in
• acoustic and electrical insulation
• repair insulation and refractory lining without interrupting the movement of the furnace

Loose wool, or raw wool, is a loose mixture of irregularly oriented fibers of different lengths.