To produce BSFF (∅1÷3 μm) for the duplex technology. The product is obtained from 5÷20 mm gravel fractions in the form of canvas with a given density and size. This canvas is used for manufacturing environment friendly highly resilient heat- and sound-insulating materials with a high resistance to thermal transmission, aggressive substances, extreme temperature, and vibration to be employed in power engineering, metallurgy, machine-, aircraft- and shipbuilding industries, and construction General view of the plant