Concast ARG 12 is an Alkali Resistant Glass (ARG) fiber used to reinforce cement and other alkali materials and to limit crack propagation in mortar & concrete. Concast ARG 12 is a high integrity strand to meet the requirements of conventional “premix” products. The chopped fibres disperse as strands in a matrix of mortar. The excellent strand integrity of Concast ARG 12 allows longer mixing time, and ensures uniform dispersion in the matrix and stable bending strength of GRC