FAQs
Is SageGlass better suited to some types of buildings?

SageGlass has been incorporated into a wide variety of commercial buildings and is a good fit for any project where controlling the sun is a challenge and preserving outdoor views is important. Some of the leading types of projects where SageGlass has been used include commercial offices, schools and universities, healthcare facilities, cultural institutions, government facilities, and skylights. Visit our case studies to learn more.

Why should I consider electrochromic glass instead of conventional glass or solar control solutions?

The answer here is simple: Give people more daylight, offer unobstructed outdoor views, and lower the building's carbon footprint. Dynamic glass outperforms conventional solutions on all these criteria. Conventional solutions are static and perform the exact same way rain or shine, hot or cold, which is not ideal. If you're focused on maximizing occupant comfort and wellness, and creating a future-proof, sustainable building, dynamic glass is the best facade solution on the market.

How is SageGlass manufactured?

We use a vacuum deposition process called "sputtering" to coat conventional float glass with layers of metal oxides. This is the same process used to make low-e and double low-e glass. The coated SageGlass pane is then paired with one or two more pieces of glass (clear, tinted, or laminated) and one or two spacers to make a double-pane or triple-pane insulating glass unit (IGU).

Take a Virtual Tour of our state-of-the-art manufacturing facility located in Faribault, Minnesota. Our virtual tour allows you to see inside our world-class manufacturing facility, meet some of our SageGlass team members, and learn about our latest innovations.

How many "tints" does SageGlass have?

The answer depends on the SageGlass product: Classic or Harmony.

  • SageGlass Classic has four tint states: clear (untinted), light, medium, and dark.
  • SageGlass Harmony has these four states plus four additional gradient tint states. 
What control system options are available?

SageGlass operates with an automated control system with options for manual control and for building automation system integration.  We typically provide wall touch panels, which allow occupants to override the automated tinting to suit individual preferences. During the design process, we work with each customer to determine how many panels they need, and where they're located. The same is true for the SageGlass mobile app. Our system integrates with every major BMS on the market, using industry-standard BACnet protocols. It is important to note that, while we support BMS integration, SageGlass is not a BMS integrator. Instead, we work with a customer's integrator, providing the necessary data and support.

How fast does the tint level change?

An average-sized pane of SageGlass transitions across 90% of its dynamic range (from clear to tinted or from tinted to clear) in a few minutes. The transition speed depends on a number of factors, including the ambient temperature and glass size: The warmer it is outside, the faster the glass transitions. Larger panes take longer than smaller panes to fully transition. Also, keep in mind that in day-to-day use the glass often changes in smaller increments (e.g., from one intermediate state to the next lighter or darker state) rather than from fully clear to fully tinted, so the transition takes less time.

What happens when a building has a power outage?

When power is lost, SageGlass reverts to a clear (untinted) state over a period of an hour or two.

What is the dynamic range of the glass?

The performance of SageGlass can range from 60% visible light transmission in its clear state, down to 1% in its tinted state, with a solar heat gain coefficient that varies from 0.41 on the high end to 0.09 on the low end. Learn how the dynamic range affects both light transmission and solar heat gain. These are the values for a typical double-glazed unit, but changes to IGU makeup, such as triple glazing, impact these values.

Where in the Insulated Glass Unit (IGU) is the SageGlass coating?

How Electrochromic Glass Works

One unique element of SageGlass is that all of our IGUs are laminated. We apply the EC coating on a 2.2mm annealed lite which is laminated with a SentryGlas interlayer to whichever outboard lite is needed for the project requirements. Thus, the EC coating is on surface #4. This is important for a couple of reasons. First, on surface #2, we apply different coatings for aesthetic benefits. Second, it allows flexibility in outboard lite selection. Others in the EC industry apply the coating directly on the outboard lite. This means, limits to aesthetic coating options, colored lites and glass thickness of the outboard lites. Our approach provides maximum flexibility.

Learn more. Visit our How Electrochromic Glass Works page.

What is the durability and longevity of SageGlass?

We bring the full expertise of Saint-Gobain, in both coated glass and IGU fabrication, to the SageGlass process. SageGlass technology has undergone rigorous performance and durability testing by independent third parties, including the U.S. Department of Energy (DOE) and leaders in the glass fabricating and OEM skylight industry. SageGlass IGUs were the first products to pass the requirements for compliance to ASTM E-2141 (Standard Test Methods for Assessing the Durability of Absorptive Electrochromic Coatings on Sealed Insulating Glass Units). This test suggests that the performance of the product is barely impacted even under aggressive ageing tests, proving the longevity of the product.

How does SageGlass compare in terms of sustainability to other solar control solutions?

With the dynamic nature of SageGlass, the facade can truly respond to the outdoors to be able to optimize to your building's energy goals. With a very low SHGC in its tinted state, the glass can offer significant comfort from heat. The dynamic nature of the glass also allows the facade to harness passive heat in climates with significant heating loads.

 

How is a SageGlass Insulated Glass Unit (IGU) installed? Are there installation limitations?

There are no significant limitations for installing a SageGlass IGU. While some care must be paid to the pigtail and frame cable, a SageGlass IGU is typically installed like any other in most common framing solutions. The SageGlass Field Operations team provides technical support to glaziers as needed.