Before double/triple glazing, the glass panes must be free of any kind of speckles, dust, etc. For this reason, the first step is to wash the glass panes. The glass panes are cleaned with special microfiber brushes and deionized water. Magnetic coatings in particular require more careful treatment during washing.

Therefore, the production line washing machines have special brushes dedicated to magnetron coatings. The glass panes are then dried in a second chamber using filtered air.

After the above procedures have been completed, the first glazing panel is positioned to receive the spacer.

Spacers are cut and assembled with corners. Silica or zeolite granules (calcium sodium silicate) are placed inside the spacer to dehydrate the trapped air.

Seals play an important role in the lifetime of a double/triple glazing system, providing mechanical strength and at the same time preventing the ingress of air and moisture.

The first seal is made with a coating of butyl (solid adhesive) which, after being liquefied by heat, is precisely applied to both sides of the spacer frame through integrated sensors that keep the frame stable. The spacer is then pressure bonded to the first pane of glass. Around the spacer we leave 1cm free for the second sealing.

Once the spacer has been placed on the first pane, the second pane is aligned with the first and the spacer so that the glazing can proceed to the crimping stage. In the press, through the double action of hydraulic cylinders that press the glass panes evenly, the latter are fully adhered to the spacer.

The use of automatic presses virtually eliminates the risk of the glass sheets not being in the same line and forming protrusions.

Then, if required, the gas is placed inside the gap in the double glazing to achieve better thermal insulation. The filling usually achieved is in 90%. Completion of the crimping is followed by the second seal.

The second sealing is made on the outside of the double glazing with a two-component cold adhesive, the main component of which is thiocollan and covers the peripheral joint between the two panes of glass.

The ingredients are mixed automatically. At this point it is necessary to point out that cold glue has better characteristics than hot glue.

Special care is required when the double/triple glazing is to be transferred to an area with different altitude or high thermal stresses are expected, as they lead to the development of critical high stresses with a risk of breakage. In these cases we take care and use specially designed valves which balance the pressure.

These valves are either removed after transport to the project or remain for the life of the glazing, depending on the technology.

During the moulding phase of double glazing, the surface coating may be on one of the four sides, depending always on the intended coefficients of absorption, reflectance, transmittance, solar factor and thermal transmittance of the moulded glass.

Regarding the composition of the double/triple glazing, the low-e coatings can be placed at position #2 or #3 of the double glazing and at positions #2, #5 of the triple glazing. In very cold climates it is preferable to place it on the inner pane (position #3) for better thermal insulation. Magnetic (soft) solar control coatings are placed in position #2 of the double or triple glazing. 

Some of the "hard" coatings that are of older technology can also be placed in the #1 position, although it is not recommended as its wear is a frequent phenomenon, resulting in a loss of energy performance.