Grade Weight Thickness Particle retention Filtration Precipitates Properties (g/m2)* (mm)* (μm) (s)* 388 84 0.21 12-15 10 Coarse crystalline Wide-pore, lose structure,
fast filtering 389 84 0.19 8-12 20 Mediun-fine crytalline Medium- to wide-pore,
medium fast filtering 389F 84 0.19 8-12 20 Mediun-fine crytalline Medium- to wide-pore,
medium fast filtering 392 84 0.17 5-8 50 Fine crystalline Medium dense,
medium fast filtering 390 84 0.16 3-5 100 Fine crystalline Narrow-pore, dense,
slow filtering 391 84 0.15 2-3 180 Very Fine crystalline Fine-pore, dense,
very slow filtering 393 100 0.17 1 300 Very Fine crystalline Very fine-pore, very dense,
very slow filtering.
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