Graham’s GThurm is made using our G2RP technology and features a composition of 80% continuous strand glass reinforcement with 20% polyurethane vs. 55% glass in fiberglass pultrusions (FRP). The higher percentage of glass incorporated into the GThurm and the polyurethane binder is what gives GThurm windows their superior strength characteristics. Traditional pultrusion materials like fiberglass (FRP) have

not been capable of meeting the more demanding requirements of the architectural window markets with AW class windows. Here is where the superior transverse strength of polyurethane permits complex parts to be pultruded without the costly need to use woven or non-woven mats and veils.

ENERGY STAR^® qualified
GThurm thermal performance is nearly double that of any other AW rated product. GThurm windows, employing triple pane, insulated glass, have achieved U values as low as 0.15, which translates to R6.5. Currently, even the best aluminum architectural grade windows can only provide U values in the .35-.50 (R2.85 – R2.0) range using the same glass.

For more GThurm information,
check our main web site.