Features: Energy saving: very low U value (< = 1.0w/m2k) can be less if filled with inert gas. Noise reduction: can reduce 30 dB (DB), if Ig is full of inert gas, can reduce another 5 dB. Specification range: Width of spacer bar: 6a, 9a, 12a, 15a, 16A Glass thickness: 3 ~ 19mm Quality standard: GB/T11944, Chinese standard. EN 1279, European Standard. ASTM E 2190, American standard.