1.Physical character : A. Appearance: milk white viscous emulsion, no mechanical impurities. B. Solid content:50±2% C.Viscosity:100-300(mPa.s) 2.Chemical Character A.PH 6-8 B.Residual styrene ≤0.02 3.Testing Method A. Color, Appearance:Visual inspection B. Solid content: Loss on drying