Mark Meshulam is an expert witness and consultant for windows, glazing and building exteriors.
Rob Struble is Manager, Business Communications, PPG Performance Glazings
Q: What can you tell us that will help put the array of Low-E glass choices into an understandable framework?
PPG: Our Low-E products fall into two categories, Sungate glass and Solarban glass.
Sungate is a pyrolytic coating designed for passive solar applications. It allows more solar heat gain into the building, especially when used on the #3 surface, which is helpful in Northern residences.
Solarban is a â€œsputter coatedâ€ solar control product. It reduces long-wave and short-wave infrared (heat) energy, which works well in Northern commercial applications and all Southern situations where high cooling loads are an issue.
Sungate and Solarban coatings can be applied to the #2 or #3 surfaces of an insulated glass unit, and can be paired with any color glass on the exterior, usually with clear on the interior. These coatings can be applied to blue, green, gray, bronze, ultra-clear and aqua-blue as well as clear glass.
A wide range of aesthetic and performance options exist within these two coating families. There are three Sungate glass coatings, and combined with tinted glasses, produces over 50 possible product combinations. There are four different Solarban glass coatings which, in combination with tinted glasses, produce well over 100 possible product performance and aesthetic combinations.
Q: Is PPG involved in the PV (photovoltaic) market?
PPG: Yes, we have some products in R&D now. In addition, we supply glass to the PV panel industry. Typically this glass is our Solarphire PV glass, and it can be supplied with an antireflective coating and a transparent conductive oxide (for thin-film pv applications).
Q: Is PPG involved in self-heating glass, glass that warms itself with the application of electricity?
PPG: I’m not familiar with that term, but PPG has a line of electrically conductive products, called INTELIGLAZE glass, which are used for special applications with would include heating. PPG also manufacturers “heat absorbing” glass – many of our tinted glasses fall into this category.
Q: Is PPG involved in â€œvacuum glassâ€, glass with R-values close to that of an insulated wall, by using a vacuum in the airspace?
PPG: No, PPG does not manufacturer vacuum glass. PPG is a primary
glass manufacturer and supplies glass to a range of glass fabricators
who produce insulating units and other finished products.
Q: What percentage of your Low-E glass is sold to other glass fabricators, and what percent is fabbed into insulated units and sold to users/installers?
PPG: Similar to above, PPG sells clear, tinted and coated flat glass to a variety of glass fabricators, who in turn make insulating units and other fabricated products.
Check out PPG’s Glass Configurator
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