21. A clear polycarbonate shield covers the wires to help prevent that from happening. 22. And several others use new lightweight materials like polycarbonate , magnesium and titanium. 23. An aftermarket company offered a top made of lightweight clear-smoked polycarbonate . 24. In this way, approximately one billion kilograms of polycarbonate is produced annually. 25. Standard Polycarbonate resins are not suitable for long term exposure to UV radiation. 26. The polycarbonate provides a barrier to wear, the elements, and fading. 27. Optical disc is made of polycarbonate plastic and aluminum. 28. Photochromic lenses may be made of glass, polycarbonate , or another plastic. 29. Often these filters are the square gelatin, polycarbonate , or glass type. 30. Previous iMac models featured either a white polycarbonate enclosure or an aluminium enclosure.
