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Citroën DS5 using Teijin’s polycarbonate resin for plastic glazing

Citroën DS5. Click to enlarge.

PSA Peugeot-Citroën Group has adopted plastic glazing made from Teijin Chemicals Limited’s Panlite polycarbonate resin in the rear quarter windows (quarter lite) of the Citroën DS5 five-door hatchback unveiled at the 2011 Shanghai Motor Show.

In the drive to produce more environmentally friendly vehicles, the automotive industry is turning increasingly to lightweight plastic for the production of vehicle frames, bodies and windows. Plastic glazing is attractive due to its favorable combination of low weight and high impact resistance.

The quarter polycarbonate windows incorporating Teijin Chemicals’ proprietary material technology were developed jointly with freeglass GmbH Co. KG, a global automotive Tier-1 leader in plastic glazing. PSA Peugeot-Citroën Group has selected freeglass GmbH Co. KG and Saint-Gobain Sekurit to supply the complete glazing car set of the DS5.

During the engineering phase of the DS5 vehicle, Teijin Chemicals and freeglass developed a specific grade of black polycarbonate alloy material, which is incorporated in the composition of the quarter windows. This material will be supplied by Teijin Chemicals for mass production over the next six years. Through the project, Teijin Chemicals and freeglass will expand their cooperative relationship, which started in the end of the 1990s, in the field of plastic glazing for the development of new technologies and materials.

The quarter window is manufactured by molding a transparent glazing and a black gloss pillar cover into an integrated piece by multi-component injection-compression and then applying hard-coating on both the internal and external sides for durability. The result is a sophisticated appearance and superior aerodynamic profile. In addition, glazing weight has been reduced by 20% compared to a conventional glazing solution.

Teijin Chemicals’ Panlite is already used in a diverse range of vehicles made by Smart, Daimler, Seat, Honda and Porsche. Teijin Chemicals is now developing, in cooperation with freeglass, a new hard-coating technology that will further improve Panlite’s weather- and wear-resistance for even wider use in vehicles.

Since December 2009, Teijin Chemicals’ Mobility Business Project, a specialized unit for providing innovative solutions to the global automotive market, has been increasingly expanding its business. The company has one of the largest multi-component rotary injection-compression molding machines with 4-axis parallelism control, which enables the production of 1.7 square-meter single-piece molds for multi-component panoramic roof systems and body panels.

freeglass, created in 2001 in Germany, is a subsidiary of Saint-Gobain Sekurit located near Stuttgart. The company is a leader in the field of plastic glazings and has developed advanced dedicated technologies used in the field of multi-component injection molding, flow coating and encapsulation applied to automotive glazings.

Several new vehicle models will be equipped with plastic glazing manufactured by freeglass in 2011 and 2012 in various application areas.



An added advantage of plastic windows in EV's might be the lower thermal conductivity, which reduces energy use for heating.


Not just in EVs. Reduced heat infiltration reduces A/C loads as well.


The next step could be the integration of high efficiency transparent solar panels in all car windows, to capture enough sun energy to feed an improved efficiency e/AC on hot sunny days. To partially recharge batteries and ventilate the interior while parked.


There would have to be a thermal barrier between the PV and the inside surface, otherwise the heat would just be captured and conducted inside.

A partially reflective window would keep heat out more effectively.


Which would be better - a white roof, or a solar roof?

(applies to buildings as well as cars).


Photon Enhanced Thermionic Emissions (PETE) could be used to capture light and heat and transform both into clean sustainable electricity at 50+ % efficiency.

Thermionic Energy Converters (TEC) could also be used to convert the heat generated into clean electricity.

Heat is energy and can be converted into electricity.

White or Black depends what you will do with the heat energy. If you're not going to convert it into useful energy, use white roofs to reflect sun energy. It's a shame not to use all that clean energy striking your roof.


How easy is it to scratch compared to glass or paint?

Give it a few years and the material is bound to become ridden with swirl marks from dirty sponges.


A glazing hardener may have to be used to make it a scratch proof as glass.


The success will depend on how scratch resistant it is.. I believe DOT regs prevent the use in windshields and side windows. Its the last frontier in weight savings for cars, lots of complaints about delicate windshield glass now.. the thin glass is easily cracked by flying stones.

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