What magical functions does LOW-E glass have when installed in doors and windows?
Release date:
2025-09-01
There are mainly two types: online coating and vacuum magnetron sputtering coating (also known as offline coating). Online-coated glass is manufactured directly on the float glass production line. This type of glass has limited variety, relatively poor thermal reflectivity, and lower manufacturing costs. Its only advantage is that it can be thermally bent for shaping. In contrast, offline-coated glass offers a wide range of options, excellent thermal reflectivity, and显著 energy-saving properties. However, its main drawback is that it cannot be thermally bent.
Characteristics of LOW-E glass:
① High infrared reflectivity allows direct reflection of far-infrared thermal radiation.
② The surface has a low emissivity E, meaning it absorbs less incoming energy and, consequently, re-emits less thermal energy.
③ The shading coefficient (Sc) has a wide range, allowing you to control the amount of solar energy transmitted as needed, making it suitable for different regions.
LOW-E coating features heat-reflective properties.
The LOW-E coating features a silver layer that reflects more than 98% of far-infrared thermal radiation, effectively bouncing heat away just as a mirror reflects light. Additionally, the shading coefficient (Sc) of LOW-E glass can range from 0.2 to 0.7, allowing precise control over the amount of direct solar radiation entering the interior, tailored to specific needs.
The Coating Process for LOW-E Glass
There are mainly two types: online coating and vacuum magnetron sputtering coating (also known as offline coating). Online-coated glass is manufactured directly on the float glass production line. This type of glass has limited variety, relatively poor thermal reflectivity, and lower manufacturing costs. Its only advantage is that it can be thermally bent for shaping. In contrast, offline-coated glass offers a wide range of options, excellent thermal reflectivity, and显著 energy-saving properties. However, its main drawback is that it cannot be thermally bent.
Features of LOW-E Glass Usage
LOW-E glass manufactured using vacuum magnetron sputtering cannot be used as a single pane; it must be incorporated into insulated glass units or laminated glass. However, its emissivity (E) is significantly lower than 0.15—often dropping below 0.01. On the other hand, LOW-E glass produced via inline coating processes can be used as a single pane, but its emissivity (E) is 0.28, meaning it no longer qualifies as true LOW-E glass according to scientific standards (which define low-emissivity materials as those with E ≤ 0.15).
How LOW-E glass works in summer and winter
In winter, when indoor temperatures are higher than outdoor ones, far-infrared thermal radiation primarily originates from inside the room. LOW-E glass reflects this radiant heat back into the interior, helping to prevent heat from escaping. Meanwhile, LOW-E glass still allows a portion of solar radiation coming from outside to enter the room. This incoming energy is absorbed by indoor objects and subsequently re-emitted as far-infrared thermal radiation, effectively trapping it within the space.
In summer, when outdoor temperatures are higher than indoor ones, far-infrared thermal radiation primarily originates from outside. Low-E glass reflects this radiation back outward, effectively preventing heat from entering the building. Additionally, for solar radiation coming directly from outside, you can opt for LOW-E glass with a lower shading coefficient to minimize its transmission indoors, thereby helping to reduce energy costs—specifically, air conditioning expenses.
Argon gas in LOW-E insulated glass
Argon is an inert gas with poorer thermal conductivity than air, so filling it into insulated glass units can reduce the U-value of the glass and enhance its insulating performance. In the case of LOW-E insulated glass, argon also helps protect the LOW-E coating layer.
The UV-attenuating function of LOW-E glass
Compared to ordinary single-pane transparent glass, LOW-E glass reduces ultraviolet rays by 25%. In comparison to heat-reflective coated glass, LOW-E glass cuts UV exposure by 14%.
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Contact Information
Contact Address: No. 7, Industrial Avenue East, Songxia Industrial Park, Shishan Town, Nanhai District, Foshan City
Warren Doors and Windows, south of Fangshan Road and west of Dongtai Road, Dongcheng Subdistrict, Linqu County, Weifang City, Shandong Province
Become A Deaters :Info@wolunmc.com
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