composition: glass fiber(filter bag) gram weight(g/m2): 800, thickness(mm): ... (+/-0.2), ventilation volume(L/m2.S): 150-250 Name: glass fiber filter bag nameGlass fiber needle feltcompositionGlass fiberGram weight(g ... , engine bed, lightly spins professions, and it is used as seal, dustproof, quakeproof, heat-preservation, sound-insulated, filters, polishing. Notes: our ...