1.Type: XYF-1 Technique requirement: Viscosity, Cps: 5-40;PH value: 8.0-11.5; Degree of substitute: 0.50-0.70; Loss on drying, %: ≤10; Purity, %:≥ 55 2. Type: XYF-2 Technique requirement:  Viscosity, Cps: 10-40; PH value: 8.0-11.5; Degree of substitute: ≥ 0.60; Loss on drying, %: ≤10; Purity, %:≥ 60 3. Type: XYG-1 : Technique requirement Viscosity, Cps: ≥250; PH value: 8.0-11.5; Degree of substitute: ≥0.5; Loss on drying, %: ≤10; Purity, %:≥ 75 4. Type: XYG-2 Technique requirement: Viscosity, Cps: ≥800; PH value: 6.5-8.0; Degree of substitute: ≥ 0.60; Loss on drying, %: ≤10; Purity, %:≥ 90