Written on 13.12.2011 - Technology
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Bayer MaterialScience and Jiangsu Top Composite Technology jointly develop eco-friendly window

A new type of glass fiber reinforced polyurethane (GRPU) pultruded window has been jointly developed by Jiangsu Top Composite Technology Co., Ltd. and Bayer MaterialScience. With the entire frame made of polyurethane, the first of its kind in China, the window’s insulation capability is expected to “bring a technical revolution to the door and window manufacturing industry and the construction industry,” according to the companies.

Glass fiber reinforced PU pultruded window

The GRPU energy-saving window adopts pultruded frame profile, composed of glass fiber as the reinforcement and a polyurethane resin from Bayer MaterialScience as the base, and produced through advanced processes of injection, gumming and pultrusion. The low thermal transmission coefficient is only 1/700 of aluminum alloy, making it a very good insulation material, especially under the condition of huge temperature fluctuations, as well as in cold or hot areas.

The linear coefficient of thermal expansion of GRPU is similar to that of the wall, therefore, when temperature changes, tightness is maintained without any gap between GRPU frames and the wall. It’s also light and strong, with a bending strength 2 – 3 times of that of aluminum alloys and 10 times of PVC, and a bending modulus is 2 – 4 times of regular FRP, eliminating the need of steel liner reinforcement, thus reducing assembly steps and inherently achieving a good insulation.

Feng Yi, President of Jiangsu Top Composite Technology Co., Ltd., said, “The brand-new GRPU energy-saving window co-developed by Bayer and us demonstrates state-of-the-art technology combining environmental protection with low energy consumption. The thermal transmission coefficient is only 1/700 of aluminum alloy, which means a massive amount of energy saved for households compared with the majority of window products in the market. It meets our pursuit for a green low-carbon life.”

Besides good strength and energy-saving capability, GRPU windows are also friendly to the environment. The pultrusion process uses a special PU resin from BMS, which contains no VOCs. According to the companies, compared with aluminum designs of the same category, GRPU frames can cut energy consumption by a half for each pound of raw material needed.

“We are very pleased to work with Jiangsu Top Composite Technology on this innovative product, which has given us the opportunity to offer not only our materials, but also our technical know-how to help them develop the best in class product,” said Dr. Ralf Busch, Country Representative Polyurethanes China.