2% solution of potassium sulfate is used as a surface hardening agent for:
Agar, a polysaccharide extracted from certain types of seaweed, is the main active ingredient in the material, while water is the major constituent in the agar impression material. A small percentage of borax is added to strengthen the gel. Since borax is a potent retarder for the setting of gypsum, an accelerator such as potassium sulfate is added to counteract the effect of borax.
Casting stone
Dental plaster
Dental stone
Type IV gypsum
Dental plaster