4SG Insulated Glass — The Future of Energy-Efficient Building Design
As the demand for energy-saving and durable architectural glass continues to grow, 4SG insulated glass has become the latest innovation in the insulating glass unit (IGU) industry. Designed to enhance performance and longevity, 4SG offers superior thermal insulation, moisture resistance, and aesthetic appearance—making it the ideal choice for modern façades, curtain walls, and windows.
What Is 4SG Insulated Glass?
4SG insulated glass (Fourth Seal Glass) refers to a new-generation warm edge spacer system used in double or triple glazing units. Unlike traditional aluminum or stainless-steel spacers, 4SG uses advanced composite materials that provide both structural stability and excellent thermal performance.
The “4SG” stands for “Fourth Seal Glass”, emphasizing its four-layer sealing system:
1. Primary seal – Butyl sealant for moisture resistance.
2. Secondary seal – Structural silicone or polysulfide for mechanical strength.
3. Desiccant barrier – Prevents condensation and moisture penetration.
4. Thermal composite spacer – Reduces heat transfer and edge stress.
This combination ensures outstanding durability, dimensional stability, and energy savings over decades of use.
Key Advantages of 4SG Insulated Glass
1. Superior Thermal Efficiency
Thanks to its low-conductivity composite spacer, 4SG IGU greatly reduces thermal bridging, lowering U-values and improving building energy performance. It helps architects meet LEED and green building standards.
2. Long-Term Durability
The four-seal design prevents gas leakage and moisture infiltration, extending the lifespan of the glass unit. Even under extreme temperature cycles, 4SG maintains its structural integrity and edge seal strength.
3. Aesthetic and Structural Benefits
The narrow black spacer gives façades and curtain walls a sleek, uniform appearance. It minimizes visual distortion and complements modern architectural designs.
4. Sustainability and Cost Savings
By reducing heating and cooling costs, 4SG glass contributes to sustainable energy use and long-term operational savings. It also supports environmental goals by minimizing the need for replacement and maintenance.
Typical Applications
• Commercial curtain walls and façades
• Residential energy-saving windows
• High-performance skylights and roof glazing
• Architectural glass partitions and double glazing systemsWhether used in office towers, shopping malls, or residential projects, 4SG IGU delivers consistent performance and visual clarity.
Technical Comparison: 4SG vs. Traditional Spacers
Why Choose 4SG Insulated Glass from China Dowin Glass Tech Co., Ltd.?
At China Dowin Glass Tech Co., Ltd., we provide high-quality 4SG IGU with international certifications, including IGCC, CE, AS/NZS, and ISO9001.
Our insulated glass units are designed for architectural, commercial, and residential projects, combining precision craftsmanship with strict quality control.
We offer:
• Customized thickness and dimensions
• Double or triple glazing options
• Argon gas filling and Low-E coatings
• Professional packaging and export support
Conclusion
4SG insulated glass represents a major leap forward in glass insulation technology. It combines superior energy performance, longevity, and design aesthetics, setting a new benchmark for high-end architectural glazing.
If you’re looking for a reliable 4SG insulated glass manufacturer, partner with China Dowin Glass Tech Co., Ltd. — your trusted supplier for energy-efficient, high-quality glass solutions.
FAQ About 4SG Insulated Glass
“4SG” stands for Fourth Seal Glass, referring to a new-generation insulating glass system that features a four-layer sealing structure for enhanced durability, thermal performance, and gas retention.
Traditional IGUs often use aluminum or stainless-steel spacers, which conduct heat and allow moisture to penetrate over time.
4SG insulated glass uses a composite warm edge spacer, which significantly improves energy efficiency, condensation resistance, and longevity.
A warm edge spacer is usually from low-conductivity materials that minimize heat transfer around the glass edges.
This reduces condensation, improves comfort near windows, and enhances the overall U-value of the glazing system.
Yes. 4SG IGUs use to in high-rise façades, curtain walls, skylights, and residential windows, providing energy savings and modern aesthetics for any type of project.
With proper installation, 4SG insulated glass can last over 25 years, maintaining excellent gas retention and seal integrity, even under extreme temperature variations.
Absolutely. Our 4SG IGUs can be combined with Low-E coatings, argon or krypton gas filling, and custom thickness options to meet your energy and acoustic requirements.