... 0.5-75mm 3.Color: White and cream 4.Wool finene Wool felt/thermal insulation felt1.Density: 0.16-0.70g/ ... and low abrasion, woollen or blended wool felts are ususally specified. Within each density range, stock many qualities, each has specific features ... the micron, as in precision filtration.Synthetic felts cannot match wool's performance in compressibility, elasticity, absorption and abrasion, but ...