MW:3000,5000,8000,10000,15000,40000,...500000 | Appearance:White to light yellowish powder | Identification: Conforms | Optical rotation:+90°- +110° | Heavy metals:≤ 20ppm | PH:5.5-7.5 | Chloride:≤ 0.106% | Loss on dry: ≤ 10.0% | Sulfate:≤ 0.48% | Arsenic: ≤ 20ppm | Sulfur content:15.0-20.0% | Intrinsic viscosity: 40000MW