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Kunxing Glass Mirror Products Co,Website:http://www.dgkxglass.com,.Ltd is one of the leading 4+9a+4 insulating glass manufacturers in China, welcome to buy 4+9a+4 insulating glass from our factory.Description Insulated Glass also known as double glazing are double or triple glass window panes separated by an air or other gas filled space to reduce heat transfer across a part of the building envelope.Glass in windows is used to provide light and allow a view from either side to the other side. While the composition and manufacturing of glass is covered elsewhere, for the purposes of this articl