... of 120 mesh,initial setting 7minutes, final setting 15 3)Annual outpuoutput is 200000t gypsum powder :we are the professional manufacturer ... for gypsum powder more than 20 years.Annual output is 200000tons. we have different kinds of gypsum powder ... 120 mesh,4)marked thick 75%,5)Initial setting 7 minutes, Final setting for 15 ...