There are six standard GLARE grades (GLARE1 through GLARE6) with typical densities ranging from , which is similar to the density of fiber. These densities are smaller than the density of 2024-T3 aluminum alloy, a common aluminum alloy in aircraft structures that is also incorporated into all but one of these GLARE grades. (GLARE1 uses the 7475-T761 alloy instead.) As the strength of the composite varies with fiber direction, the GLARE grades differ by the number and complexity of pre-preg plies and orientations within a composite layer. Each GLARE grade has A and B variants that have the same number of plies but with alternate fiber orientations. The standard GLARE grades are cured in an autoclave at for 3.5 hours under , and they use the FM94 epoxy pre-preg.