Sungate ThermL Glass by Vitro is a low-emissivity coating for the interior surface of a 1-inch insulating glass unit. It reduces heat transfer and improves U-values when paired with Solarban solar control low-e glass on the second surface. Ideal where increased insulation performance is needed, Sungate ThermL glass enhances U-value but does not change the visual characteristics of the IGU thanks to its colorless and low reflective aesthetic. The coating is durable and resistant to mechanical abrasion.