Sikadur®-31 Hi-Mod Gel, is a 2-component, 100 % solids, solvent-free, moisture-tolerant, high-modulus, high strength, structural epoxy paste adhesive. It conforms to the current ASTM C-881, Types I and IV, Grade-3, Class-B/C and AASHTO M-235 specifications. Structural bonding of concrete, masonry, metals, wood, etc. to a maximum glue line of 1⁄8”. Two container set. Convenient easy mix ratio A:B = 1:1 by volume. A is 3 gallons and B is 1 gallon.