... (+/-0.2), ventilation volume(L/m2.S): 150-250 nameGlass fiber needle feltcompositionGlass fiberGram weight(g/m2)800(+/-25)Thickness(mm ... , metallurgy, engine bed, lightly spins professions, and it is used as seal, dustproof, quakeproof, heat-preservation, sound-insulated, filters, polishing.Notes ... .If you are interested in your production, please contact me. fiber glass needle felt, fiber glass media