Permlastic is a polysulfide, condensation-cured, elastomeric impression material in three viscosities. Light-Bodied Permlastic is the most free-flowing of the Permlastic materials. It is excellent for inlay and fixed bridge impressions. Light-Bodied Permlastic is a syringe material that is usually used with Heavy-Bodied Permlastic. Light Body bonds completely with both Regular and Heavy Bodies, resulting in impressions with great accuracy and fine definition.