For now, the material, Calibre 940 TNIR (XZ 94258.00), is only available in Europe from the supplier, Styron (Horgen, Switzerland). Processors can process the TNIR material as a coextruded layer to their PC sheet. According to Styron, not only will this improve the sheet's green footprint, but it also gives the sheet a neutral tint, with no sign of the coloration evident in many other TNR polycarbonates, says Styron.

The need for more energy efficiency and for eco-friendly solutions in building and construction (B&C) applications is growing, as is the demand, and in some countries legislators also are taking long looks at building codes, which likely will become more restrictive vis-à-vis energy efficiency.

Buildings with large transparent surfaces, often composed of polycarbonate sheet, often face the challenge of solar heating caused by the sun's infrared rays, increasing the need for temperature controls and air conditioning. This new coextruded solution is designed to appeal to end-users looking to save on air-conditioning costs.

During processing, Styron recommends that this new specialty grade be applied as a separate, coextruded layer between the bulk PC and the UV blocking top layer of the sheet. This technique should also be more cost effective than the incumbent solution of adding near infrared blockers to the bulk PC. The standard procedures and equipment currently used to apply UV blockers can be used. Styron has filed an application patent for its recommended multilayer concept.—[email protected]