How does double
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.
reduces thermal transfer between indoor and outdoor environments
heating and cooling costs
a more comfortable interior environment for building occupants
and/or tinted coatings available to further enhance resistance to heat gain
features include: desiccant drying agent in the spacer, bent corners and keyed
joints, a polyisobutylene primary seal and polysulfide or silicone secondary
Argon fill to provide superior thermal insulation.
or Heat Treated glass for safety and security
How the units are
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 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.
❶ 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
❷ 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.
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.
❹ 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.
The following guide
specification is recommended for specifying insulating glass units: