An Insulated glass is made by fusing two or more glass panes spaced by dry air or inert gas. The system is perfected by separating the glass panes with an aluminium spaced tube, joined at at one point and bending at 4 corners for comparatively better insulation and filled with a specially designed absorbent. The unit is then sealed around the perimeter with a flexible sealant . The inner seal is applied with butyl (polyisobutylene) sealant and the outer with an elastic based on polysulphide polymer or silicone.