Products that were added to this list since the ... including bentonite, must meet the requirements of ANSI/NSF Standard 60 2003e. • Bentonite used for grout must meet ANSI/NSF Standard 60, or be a natural bentonite without additives. ... Baroid Bentonite Pellets well sealant . Barogrout* well sealant Barotherm Gold. 4 (IDP502) well sealant .