In a one-step production process by spunbond runner molten basalt misses the developing zone air blowing to the fiber, and then the camera voloknoosazhdeniya where it is 100%-crystallization. Because of this, the fiber becomes brittle fiber density - high, and vibration resistance - very low.
In the two-step method of production, the first step of stretching the melt is basalt primary crystallization and basalt fiber yarns 200-250 microns thick. In the second stage fiber fall within the high temperature gas-burner, wherein the fibers swell to a diameter of 1.5-2 microns. As a result, the elastic thread is obtained, low-density carpet material to shakeproof maximum temperature of 850 º C.