The Margel VPI600 , like the VPI580, is manufactured for insertion into concrete structures. However, VPI600 is a gel version of the product that allows for easy injection into the holes of concrete structures. The product is supplied in a 300ml sealed twin cartridge system (Figure B). Each cartridge contains a blend of all three active ingredients and should be installed by a Margel approved contractor to the exact dosage recommended by the manufacturer. The gel structure forms 50% of the strength of the VPI580 cartridge.