How does double glazing work?:

Double glazing from Pharos Glass company consists of two or more panes of glass separated by an aluminum spacer, bonded together to form a completely sealed unit called an Insulating Glass Unit (IGU). Heat and cold pass through single glass,when used in conjunction with low-e and/or reflective glass coatings,IG units become effective means to conserve energy and comply with energy codes. The most common architectural insulating glass unit configuration is 1/4″ glass/ 1/2″ air space/ 1/4″ glass, whereas Pharos units trap a layer of air or Argon gas between two panes, thus creating a kind of blanket that protects the warmth of your interior. This reduces heat transfer from inside to outside (winter), and outside to inside (summer). Compared with standard glass, Pharos double glazing can reduce heat loss by as much as 70%, helping keep your home warmer and reducing energy costs.

Insulated Glass Features:

■ Greatly reduces thermal transfer between indoor and outdoor environments

■ Lowers heating and cooling costs

■ Creates a more comfortable interior environment for building occupants

■ Low-E and/or tinted coatings available to further enhance resistance to heat gain

■ Construction features include: desiccant drying agent in the spacer, bent corners and keyed joints, a polyisobutylene primary seal and polysulfide or silicone secondary seal.

■ Optional Argon fill to provide superior thermal insulation.

■ Laminated or Heat Treated glass for safety and security

How the units are glazed

If an IG unit sits in water or the seal system is overstressed, there is no unit construction that will deliver long-term performance. Pharos believes that our dual-seal construction is the most versatile IG seal system because of its excellent weather ability. In fact, in both real-world and simulated weathering conditions, Pharos’s dual-seal system outperforms other IG unit constructions.

Pharos Unit Construction

Pharos IG units consist of two or three lites of glass separated by an inorganic metal spacer (Figures 1-1 and 1-2). Spacer corners are bent to be air/gas tight. The spacer contains desiccants which adsorb the moisture vapor within the airspace. The dual seal construction has a primary seal of polyisobutylene(Butyl) (PIB) and a secondary seal of silicone.

 Primary Seal: Polyisobutylene (Butyl) (PIB) minimizes moisture permeation, increases UV resistance, reduces the potential for chemical fog in airspace, and provides the lowest argon permeation of all known sealants.

 Secondary Seal: Specially formulated silicone for IG units provides long-term adhesion, UV protection, and greater resistance to the effects of solvents, oils and short-term water immersion. Silicone is recognized as the best sealant for resisting weathering and adhering to glass substrates. Because of its structural properties, silicone provides structural integrity of the IG units.

❸ Spacer: Stainless steel spacer Or Aluminum features a roll form design to provide maximum area for primary and secondary sealant coverage. It provides increased resistance to condensation and less stress on IG seal system. Bentcorners completely seal the spacer periphery to eliminatemoisture vapor transmission into the airspace through corners.

 Desiccants: Molecular sieve provides initial frost points below – 85° F. Desiccant assures optimum moisture adsorption while minimizing the effects of geometry and temperature related pressure changes.


Insulating Glass Guide Specifications:

The following guide specification is recommended for specifying insulating glass units:

  • Dual Seal
  • PIB Primary Seal
  • Silicone Secondary Seal
  •  Bent Corners
  • Argon Fill