Process »»»

A standard insulating glass involves the bonding of two or more parallel glass panes together to form a hermetically sealed unit. Its principle is based on the creation of a cavity of Dry Air or Inert Gas between two or more panes of glass. The system is perfected by separating the glass panes with an aluminum spacer tube, joined at each corner and filled with a specially designed adsorbent. The unit is then sealed around the perimeter with a flexible sealant. Because of the low heat conductivity of the enclose dry air between the glass panes, heat transmission through the window is drastically reduced.

The inner seal (primary seal) is applied with butyl or poly iso butylenes sealant and the outer (secondary seal) with an elastic sealant based on poly Sulphide or silicon polymer. The inner seal is hot applied and plastic in nature. It is used to fix the spacer bar to the glass and to reduce the moisture vapors transmission into the dry air cavity to a very low level. The later is due to the fact that butyl sealant provides an optimal moisture barrier compare to other sealing material.

The outer sealant is cold applied and is a chemically reactive material, which bond, to glass and cures to an elastic mass. The function of this sealant are multifarious, they include:

	•	The bonding of glass panes and spacers to one another to form the Insulating glass units.
	•	Protection against chemical attack from outside.
	•	Resistance against water entry either in fluid or gaseous form.

The aluminum profile or spacer bar is responsible for establishing a precise distance between the glass panes, as there is a correlation between the distance of the glass panes and the energy saving properties. And last but not the least the adsorbent will dry the cavity filling completely to prevent the condensation inside the glass panes. The moisture, which has to be absorbed comes form the wet air that is trapped into the intermediate air space during the production and from the moisture vapors which penetrates through the sealant during the long lifetime for the insulating glass unit.