Basalt sound-absorbing mats (BSМ) make of canvases ультра-, superthin glass fibers from the rocks reveted by acoustically transparent environment - glass or кремнеземной a fabric. The mats are applied as sound-proof наполнителей in designs шумопоглощающих the devices working in an interval of temperatures from -50 °С up to + 450 °С with an environment from fiber glass fabric, from -50 °С up to + 700 °С with an environment from siliceous fabrics. Density of mats depending on initial materials fluctuate from 22 up to 64 kg/m³.

The name of a range of frequencies and its designation	Normal factor of a sound absorption
	Thickness of mat, mm
	30	50	100	200
Low-frequency (L)	0,05-0,17	0,11-0,38	0,22-0,82	0,85-0,70
Middle- frequency (M)	0,17-0,38	0,38-0,68	0,82-0,72	0,70-0,74
High-frequency (H)	0,88-0,75	0,68-0,77	0,72-0,82	0,74-0,84

The sizes of mats, mm:

• Length 500, 600, 1000
• Width 500, 600, 1000
• Thickness 30, 50, 100, 200

The mats do not allocate toxic substances. In the air environment, sewage and at presence of other substances do not form toxic connections. The mats are a nonflammable and not explosive material.