... ≤ 20 Kaolin turbidity degree ≤ 20 PH 7.5-9.5 Formaldehyde Dissolvability Test Within 10 minute Relative density: 1570kg/m3 Melting ... temperature 300°C Melting point (oC) 354°C Dissolvability carbinol, formaldehyde, acetic acid , hot glycol, glycerin, pyridine; slightly in water, ethanol ...