Gypsum Retarder,Gypsum Admixtures,,Gypsum Retardant, Set Retarder,Plaster Addtives, Plaster Products. Item No.: SUNBO SG-11Gypsum Retarder 1.DescriptionSUNBO SG-11 is one kind of high efficient ... -toxin and non-flammable, so the transportation requirement is general. Gypsum Model Broad Retarders-SUNBO SG-11