Chem Link SOF®-Rod is a cylindrical, flexible foam rod for use as a sealant backing. SOF®-Rod is composed of a bi-cellular material. SOF®-Rod may also be used as a gasket or sealing material as per ASTM C 717. TYPE: B - Per ASTM C 1330. Cylindrical, flexible sealant backings composed of bi-cellular material. Also reference ASTM C 717 for use as gasket or sealing material. TYPE: 3 - Per ASTM D 5249. Round rods of various diameters for use with non-sag and self leveling cold applied sealants. TEMPERATURE LIMITS: -45˚F to +160˚F.