What are the optical properties of laminated glass
Information summary：The overall optical performance of laminated glass is excellent and stable, with good transparency, low optical distortion, and controllable filtering. It can meet the requirements of lighting and visual effects in most scenarios such as buildings, automobiles, and high-speed trains. The specific performance is as follows:
The overall optical performance of laminated glass is excellent and stable, with good transparency, low optical distortion, and controllable filtering. It can meet the requirements of lighting and visual effects in most scenarios such as buildings, automobiles, and high-speed trains. The specific performance is as follows:
1. High transparency to meet basic lighting needs
The visible light transmittance of ordinary laminated glass (made of colorless transparent PVB film and original float white glass) can reach over 85%. Some laminated glass made of ultra white glass original sheets can even exceed 90% in transmittance, which is almost the same as that of single float glass. It is fully suitable for scenes with high lighting requirements such as building curtain walls and car windshields.
Even for multi-layer sandwich structures (such as three-layer glass+two-layer film), the decrease in transmittance is relatively small, only 3% -5% lower than single-layer glass, and will not significantly affect the brightness of indoor or car lighting.
2. Low optical distortion to ensure visual clarity
The original sheet of laminated glass is mostly made of excellent float glass with high flatness; During the hot press bonding process, the film is tightly adhered to the glass without defects such as bubbles or impurities, resulting in minimal optical distortion. Observing objects through the glass will not cause deformation or ghosting.
This feature is particularly important for the front windshield of a car, as it can avoid visual errors caused by glass distortion and ensure driving safety for the driver; It is also suitable for scenes that require high visual accuracy, such as museum display cabinet glass and precision instrument observation windows.
3. Controllable filtering performance, adaptable to different functional requirements
UV filtration: one of the core advantages. The PVB film of laminated glass can absorb more than 99% of ultraviolet rays, which can not only prevent indoor furniture and fabrics from fading and aging due to ultraviolet radiation, but also reduce the damage of ultraviolet rays to human skin, without the need for additional film to achieve sun protection effect.
Infrared filtering: can be achieved through customized film. Select PVB film with added insulation particles (such as insulation type PVB), which can reflect or absorb some infrared radiation, reduce the heat caused by solar radiation, and have both light transmission and insulation functions. It is commonly used in building energy-saving curtain walls and car privacy glass.
Colored laminated glass: By using stained glass or colored film, the light transmittance and shading properties can be adjusted while maintaining good visual transparency. For example, brown and gray laminated glass can have a light transmittance controlled between 40% -70%, which can reduce the glare of strong light without affecting the clarity of the line of sight.
4. Optical performance optimization in special scenarios
Anti glare: Some laminated glass can be treated with matte particles added to the film or lightly frosted on the glass surface, which can soften strong light and avoid glare caused by direct light. It is suitable for scenarios such as sports arena grandstand glass and highway noise barriers.
Bulletproof/Explosion proof Laminated Glass: Although the glass has multiple layers and a large thickness, it can still maintain good optical performance by optimizing the flatness of the original film and the film bonding process, without obvious visual blurring due to structural strengthening, meeting the dual needs of transparency and protection in scenes such as banks and armored vehicles.
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