4SG windows glass system

4SG windows glass is a high-performance insulating glass (IG) unit featuring a proprietary long-life sealing system. Unlike conventional IG units that use rigid metal spacers (e.g., aluminum), 4SG utilizes a flexible, non-metallic warm-edge spacer with chemical bonding. This creates an extreme, durable seal that maintains gas fill and prevents moisture ingress. 

Features

• Superior Thermal Insulation – The non-metallic spacer drastically reduces heat transfer between indoors and outdoors, minimizing the “cold draft effect” even with large indoor-outdoor temperature differences.

• Warm-Edge Effect – Reduces condensation and frost on the glass surface, especially in cold northern climates.

• Extreme Long-Term Sealing – Chemically bonded, not just mechanically sealed. Argon gas retention is dramatically improved: annual leakage rate <0.1%, compared to >1% for conventional aluminum spacer units (which lose most gas within 3–5 years).

• Excellent Acoustic Insulation – The cavity width is optimized to create reverse sound waves, and the argon fill further enhances noise reduction.

• High Transparency & Low-E Compatibility – When paired with Low-E coating, it blocks thermal radiation while maintaining >80% visible light transmittance. Cavity is filled with >95% argon to reduce convection.

• Durability Certified – Passed 5× durability cycles (each cycle equivalent to 10 years in mild conditions). After 25 years, the argon content remains ≥80%

Company show

Established in Jinan in 1985, Shandong Yaohua Glass began with manual cutting operations and has since risen to become a globally recognized leader in smart glass manufacturing. Today, the company operates a state-of-the-art facility spanning 50,000 square meters. It is certified under ISO 9001 and ISO 45001, along with numerous other credentials, including China‘s 3C mark, the EU’s CE certification, and the US SGCC standard, KS certification. Additionally, the company holds multiple national patents.

FAQ (Frequently Asked Questions)

Q1: Why is 4SG glass better at keeping a room warm in winter?
A: The non-metallic warm-edge spacer stops heat from escaping through the glass edge. Combined with >95% argon fill and Low-E coating, it cuts heat loss by reducing conduction, convection, and radiation.

Q2: Does 4SG glass really last 25+ years without fogging?
A: Yes. The chemical bonding creates a truly hermetic seal that blocks water vapor. Independent testing (5-cycle GB/T11944-2012) proves it resists gas leakage and moisture ingress far longer than conventional units.

Q3: How much quieter is 4SG glass?
A: The specific cavity width generates reverse sound waves, and argon gas further dampens sound transmission. It provides noticeable noise reduction compared to single-pane or poor-seal double glazing.

Q4: Can I use 4SG glass with any window frame?
A: Yes, 4SG is a sealed insulating glass unit that fits standard frames. Its flexible spacer also reduces thermal stress on the frame.

Q5: Is the 25-year warranty really valid?
A: Yes. The warranty covers seal integrity, argon retention, and freedom from internal fogging/discoloration for 25 years, backed by the 5-cycle durability test 

Q6: How does 4SG compare to “warm edge” spacers like TPS?
A: 4SG is a complete system (spacer + primary seal + secondary seal) with chemically bonded, flexible material. It offers superior long-term argon retention and is the only one passing the Chinese 5-cycle test. Many warm-edge spacers only address the spacer, not the entire sealing system.

Q7: Does 4SG glass reduce condensation on the window surface?
A: Yes. The warm-edge effect raises the glass edge temperature, significantly reducing the risk of indoor condensation and frost in cold climates.