What is Low-E glass?

Low-E glass (Low Emissivity Glass), full name low-radiation coated glass, is an energy-saving glass with a special metal or compound film on the surface. Its core functions are high light transmittance and efficient heat insulation:

Light transmittance: allows more than 80% of visible light to enter the room, maintaining natural lighting.

Heat insulation: reflects more than 90% of mid- and far-infrared rays, significantly reducing heat transfer.

Through this "warm in winter and cool in summer" characteristic, Low-E glass has become the preferred material for modern green buildings, especially suitable for doors, windows, curtain walls and other parts.

Five core advantages of Low-E glass

1. Energy saving and environmental protection, reducing energy consumption

Winter insulation: Reflecting long-wave infrared rays generated by indoor heating, reducing heat loss, and reducing heating energy consumption by more than 30%.

Summer insulation: Blocking outdoor solar radiation heat energy, air conditioning and refrigeration efficiency increased by 20%-40%.

Emission reduction benefits: By reducing energy consumption, reduce emissions of harmful gases such as CO₂ and SO₂.

2. Excellent optical performance

The visible light transmittance is as high as 80%, avoiding the "light pollution" problem of traditional coated glass.

Low reflectivity design (usually ≤30%) ensures that the building appearance is transparent and beautiful.

3. Diversified classification to meet different needs

• According to the process:

Online Low-E (hard film): wear-resistant and corrosion-resistant, can be used as a single piece, suitable for tempering, laminating and other processing.

Offline Low-E (soft film): better thermal insulation performance, but it needs to be made into hollow glass to protect the film layer.

• By function:

High transmittance: transmittance>70%, suitable for cold northern regions.

Sunshade: transmittance<50%, suitable for hot southern climates.

By the number of silver layers: single silver, double silver, triple silver. The more silver layers, the lower the emissivity (e.g. triple silver emissivity is only 0.02).

4. Long-lasting durability and flexible processing

The online Low-E film layer can last up to 30 years, supporting secondary processing such as hot bending and tempering.

Various colors, including blue, gray, silver, gold, etc., suitable for different architectural styles.

5. Economic and policy support

Although the initial cost is high, the long-term energy-saving benefits are significant, and the investment recovery period is about 5-8 years.

Meet global green building certification standards (such as LEED) and enjoy policy subsidies.

Future trends: Technological innovation drives industry upgrades

As building energy-saving standards improve, Low-E glass is developing in the following directions:

Multi-layer composite technology: Triple silver and quadruple silver coatings further improve the U value (heat transfer coefficient).

Intelligent dimming function: Combined with electrochromic technology, dynamically adjust the transmittance.

Green production process: Reduce energy consumption and pollution during the coating process.