SGG Clear Cosmos (ET 125), a high-performance coated glass designed by Saint-Gobain for year-round energy efficiency. By utilizing advanced magnetron sputtering technology, this product delivers exceptional solar control and thermal insulation, keeping interiors cool during summer and warm during winter. The glass is versatile enough for various architectural uses, including skylights and facades, and is available in multiple thicknesses and processing formats like tempering or lamination. Key benefits highlighted include UV protection, improved occupant privacy, and a reduction in internal reflections for clearer views at night. Furthermore, the material supports sustainable building initiatives and complies with several international green certification standards. Overcast and sunny visual comparisons demonstrate how the product maintains its aesthetic appeal across different environmental conditions
SGG Clear Cosmos (ET 125) is an energy-efficient glass designed to provide high performance and manage indoor temperatures across all seasons. It achieves this through a dual-action approach of solar protection and advanced thermal insulation.
The glass manages seasonal temperature changes in the following ways:
Summer: Keeping Living Spaces Cool
To maintain a cool interior during summer, SGG Clear Cosmos utilizes a very low Solar Heat Gain Coefficient (SHGC). This feature provides solar protection by limiting the amount of solar heat that enters the building.
- In a Single Glazed Unit (SGU), the SHGC is 0.29 (EN) or 0.33 (NFRC).
- In a Double Glazed Unit (DGU), the SHGC is further reduced to 0.23 (EN) or 0.25 (NFRC).
Winter: Keeping Living Spaces Warm
During winter, the glass focuses on advanced thermal insulation to keep heat inside the living space. This is achieved by maintaining a low U-Value, which measures the rate of heat transfer. The sources highlight that this product offers the lowest U-value available in SGUs.
- The SGU has a U-Value of 3.8 (EN) or 3 (NFRC).
- The DGU provides even better insulation with a U-Value of 2 (under both EN and NFRC standards).
Manufacturing and Application
These thermal properties are the result of an advanced magnetron sputtering process conducted under vacuum conditions, which applies a specialized coating to the glass. This coating allows the glass to be used effectively in various applications, such as windows, skylights, and structural or façade glazing, to ensure occupant comfort throughout the year.
It is important to clarify that occupant privacy is actually achieved through the glass’s external reflection, while “low reflection” specifically refers to its internal properties designed for night time viewing.
The SGG Clear Cosmos (ET 125) improves night views by utilizing low internal reflection, which reduces the amount of light from the interior that reflects off the glass surface. This technical feature allows for a clearer view of the outside environment during nighttime when indoor lights are on.
According to the sources, the specific internal reflection values for SGG Clear Cosmos are:
• Single Glazed Unit (SGU): 9% internal reflection.
• Double Glazed Unit (DGU): 15% internal reflection.
While the sources do not explicitly describe the physics of this improvement, it is generally understood in the industry that high internal reflection causes a “mirror effect” at night, where the occupants see their own reflection and the interior of the room rather than the view outside. By keeping these reflection percentages low, SGG Clear Cosmos minimizes this interference, resulting in a better night view.
This feature is particularly beneficial for applications like windows, façade glazing, and skylights, where maintaining visual connectivity with the outdoors is a priority regardless of the time of day
Here is how SGG Clear Cosmos (ET 125) manages privacy during the day:
• Higher External Reflection: To provide privacy for those inside the building, the glass is designed with a significant level of external reflection. According to the performance data, the External Reflection is 28% for Single Glazed Units (SGU) and 29% for Double Glazed Units (DGU).
• Visual Obscuration: This external reflection creates a mirror-like effect on the outside of the building. The sources include images of the glass under both sunny and overcast conditions, showing that the exterior surface reflects the sky and clouds, effectively blocking the view into the interior for people outside.
• Occupant Privacy Feature: The sources explicitly list “Offering Occupant Privacy” as a key feature of SGG Clear Cosmos. By reflecting a large portion of the outdoor light, the glass ensures that the interior remains private during daylight hours.
In contrast, the “low internal reflection” (9% for SGU and 15% for DGU) is a separate feature intended to provide a better night view by reducing reflections from indoor lights, as mentioned in our previous conversation
The sources state that SGG Clear Cosmos (ET 125) is manufactured using a state-of-the-art magnetron sputtering process that takes place under vacuum conditions. While the sources do not detail the specific mechanical steps of this process, they confirm that it is used to apply the advanced coating responsible for UV protection, solar control, and thermal insulation. This coating is applied to Face 2 of the glass in both single (SGU) and double glazed (DGU) configurations.
The following technical details regarding how magnetron sputtering works are not found in the sources, and you may wish to verify them independently:
• Plasma Generation: Inside a vacuum chamber, a gas (typically argon) is ionized to create a plasma.
• Target Bombardment: Magnets are used to concentrate the plasma near a “target” material (the substance intended for the coating). High-energy ions from the plasma strike this target.
• Deposition: This bombardment causes atoms from the target to be ejected or “sputtered” into the vacuum space. These atoms then settle onto the surface of the glass, forming an extremely thin and uniform layer.
• Precision: This process allows manufacturers to control the thickness and composition of the coating at a microscopic level, which is how they achieve specific performance metrics like the low Solar Heat Gain Coefficient and UV filtration mentioned in the sources
It is important to clarify that based on the sources, occupant privacy is provided by high external reflection, rather than “low reflection.” In the technical specifications for SGG Clear Cosmos, “low reflection” refers specifically to internal reflection, which is designed to improve night views by reducing reflections from indoor lights.
Occupant privacy during the day is managed through the following mechanisms:
• Significant External Reflection: The glass is engineered with an external reflection of 28% for Single Glazed Units (SGU) and 29% for Double Glazed Units (DGU).
• Mirror-Like Effect: This level of external reflection creates a mirror-like appearance on the outside of the building. Source images demonstrate that under both sunny and overcast conditions, the glass reflects the sky and clouds, effectively obscuring the view of the interior from the outside.
• Privacy as a Core Feature: The sources explicitly list “Offering Occupant Privacy” as a primary benefit of this advanced coated glass.
By reflecting a large portion of the outdoor light away from the building, the glass ensures that while occupants can see out, people outside cannot easily see in, thereby maintaining privacy during daylight hours
SGG Clear Cosmos includes UV protection as a standard feature, which works in tandem with its solar control and thermal insulation properties to enhance the indoor environment.
The sources provide the following insights regarding its impact:
• Occupant Comfort: The glass is specifically designed to add value to occupant comfort by providing solar protection and managing the energy that enters a building. By utilizing a very low Solar Heat Gain Coefficient (SHGC), the glass limits the amount of solar heat transmission, which, combined with UV protection, helps create a more stable and comfortable interior climate.
• Advanced Coating Technology: This protection is achieved through a specialized coating applied via a magnetron sputtering process. In both single and double glazed configurations, this coating is placed on Face 2 to effectively intercept solar radiation before it enters the living space.
Note on Interior Longevity: While the sources explicitly list UV protection as a feature and mention its contribution to occupant comfort, they do not provide specific details or explanations regarding how this feature improves the longevity of interior items
SGG Clear Cosmos (ET 125) provides UV protection as one of its primary features.
Based on the sources, the glass offers this protection through the following means:
• Advanced Coating Technology: The glass is manufactured using a state-of-the-art magnetron sputtering process under vacuum conditions. This process applies a specialized coating that provides solar control and protection,.
• Coating Placement: In both Single Glazed Units (SGU) and Double Glazed Units (DGU), the performance-enhancing coating is positioned on Face 2 of the glass to effectively manage incoming solar radiation.
• Solar Control Properties: While the sources do not list a specific percentage for UV transmission, they highlight that the glass is engineered for high performance in solar protection, which includes a very low Solar Heat Gain Coefficient (SHGC) to manage solar energy,.
By blocking a portion of the solar spectrum, the glass helps protect interiors from the harmful effects of UV rays while contributing to overall occupant comfort and energy efficiency
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