1)The wool felt products are made from raw wool. 2)wool felt performance standards: GB FZ/T25001-92. Product’s Namewool felt,sealUsageFelted wool is used in mechanism, aviation, shipping, train, auto, metallurgy, chemical, industry, textileindustry, seal, dustproof, cushion, quakeproof, heat preservation,heatproof,sound insulation, fire retardant,insulation.Filtration:air,petroleum,water. ...