Table 1.

The Efficiency of Air Cleaning from Solid Particles by the Developed Filter Materials

Scheme of FM production	No. of layers	Filtration efficiency, % (by the particle size, μm)
		0.3	0.4	0.5	0.6	0.7	0.8	0.9	1.0
I	2	82.1	84.2	86.3	89.3	92.4	97.7	98.0	98.9
	4	95.0	96.5	97.1	98.9	97.8	98.5	99.8	99.9
	6	96.0	96.9	97.7	99.4	99.7	99.8	100	100
II	2	84.0	88.6	91.3	94.0	99.5	99.8	99.9	100
	4	95.9	97.6	97.9	99.3	99.9	99.9	100	100
	6	97.3	97.8	98.6	99.8	100	100	100	100
III	2	83.8	88.4	90.1	93.3	99.4	96.6	99.7	99.9
	4	95.2	97.2	97.2	99.1	99.8	99.8	99.9	100
	6	96.2	97.5	97.9	99.7	100	100	100	100
IV	2	94.1	97.3	98.9	99.9	100	100	100	100
a	1	78.6	83.5	85.9	87.8	89.3	91.9	97.4	99.4

^a Filter material made of a film produced by extrusion of polypropylene/copolyamide (thickness −350 ± 20 μm).

FM, filter material.