China 5+9A+5 excellent quality low e double glazed windows energy saving glass suppliers
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5+9A+5 double glazing glass windows consist of one 5mm low e glass panel and one 5mm tempered glass separated by a 9mm aluminum air spacer. The air spacer is firstly joint with glass with butyl sealant and later double sealed with structural sealant. This kind of structure is to achieve energy saving function as well as soundproofing function