Twenty-four units of IGU for the durability testing were manufactured using standard 14 x 20 in. (350 x 500 mm) configurations as prescribed by ASTM E2190-10 . The units were fabricated using tempered glass with a thickness of
0. 185 in (4.7 mm) for each lite. The outer lite has a Low-E coating on the #2 surface that is deleted to the PIB interface. The air space was established using a 13.2-mm, mill-finish aluminum spacer. The PIB thicknesses ranged between
0. 010 in. (0.25 mm) and 0.030 in. (0.76 mm) and an average PIB thickness of
0. 015 in. (0.38 mm) was attained. Two legs of the spacer were filled with a 3A molecular sieve desiccant. The units were filled with argon to greater than 90 % fill level and then sealed with 3/8 in. (9.5 mm) of silicone insulating glass sealant.