New stylish and more elegant cars are being designed by prominent Car Manufacturers to make their models more and more attractive to International Markets. New Cars have steep and trendy design with large glass surfaces. Though it looks great to have large glass surface in a car, it also cause some serious issues related to car heating and passenger discomfort. Which is neither desired nor acceptable. It leads to new innovation and inventions that leads to Solar Coated windshield.
Problems due to IR and UV rays
While designing a car with large windshield looks great and increase effective visibility for the driver and also passengers, It also adds its heating area. More the size of Windshield, more it absorb the IR radiations from SUN. These radiations got absorbed by car interiors and they remit IR rays which make inner compartment heated. It requires an adequate air-conditioning system to keep it cool. It adds to your engine load and hence to your fuel consumption. IR heating also creates issues with other delicate digital and electronics systems used in high performance and premium cars. Other issue with IR absorption is that your cars interior fabric deteriorate sooner than its life. It adds to maintenance.
To avoid Drive discomfort and extra maintenance Glass Manufactures designed new innovative windscreens with an additional coating layer under outer glass layer that can absorb additional heat without compromising the car design and visibility. These silver coated windshields are called SOLAR COATED WINDSHIELDS and are widely used in High end and premium cars like Audi A8.
Solar Coated Windshield Layers
Solar Coated windshields are like any other laminated windshield but it has multi-layers of IR absorbing material. The coating consists of two layers of silver sandwiched between anti-reflective dielectric metal oxide layers. Some of the coated windshields like some Renault models have 15-20 layers of silver and titanium between the inner and outer glass sheets. This special layer is less than 50 microns thick.
How does Solar Coating Works ?
Solar coatings doesn’t absorb all of the sunlight. On the other hand, it absorbs about 50% of IR radiations and UV rays while allow visible sunlight to pass. This helps to keep the inner cabin cooler and adds to driver comfort. These multi layer coatings reduce load on Car air conditioning which ultimately adds to the car performance.
Different Solar Coated Windshield
Solar Windshields are manufactured by all major automotive glass manufactures like Saint-Gobain, Pilkington, Guardian, AGC Automotive. These are produced under different trade names and batches like Solar, Tint, Solar Green, Solex, Solextra, Solar Tint, Solar Shield. These windscreens have characteristic green tint and can absorb IR rays upto 70%. Some of these windshield have grey or bronze tint.
Other kind of Coated windshields are produced by PGW which sell it under Sungate™ trade mark. These have characteristic purple or orange tint as visible in Mercedes S Class and ML Class SUVs. According to PGW, “The Sungate™ windshield incorporates a multi-layer metal/metal oxide coating on the inboard surface of the outer glass”.
Guardian’s so-called SilverGuard comprises a family of nano-particle thin film coated laminates that provide high levels of solar energy reflection while selectively transmitting visible light. The coatings can be combined with a variety of glass substrates to achieve the full range – from maximum visible transmission and solar reflectivity to privacy-type light transmission combining solar reflectivity with absorbing solutions to achieve very low transmission levels.
Some of the popular models that have IR reflective windshields are Volkswagen Passat Coupe, Audi A6 and A8, BMW X3, X5 and X6, Porsche Cayenne and Panamera, Bentley Flying Spur.