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Windscreens are commonly made of:
Acrylic: Acrylic is a useful, clear plastic that resembles glass, but has properties that make it superior to glass in many ways. Common brands of high-grade acrylic include Polycast, Lucite and Plexiglass. There are two basic types of acrylic: extruded and cell cast. Extruded or "continuous cast" acrylic is made by a less expensive process, is softer, can scratch easier and may contain impurities. Cell cast acrylic is a higher quality acrylic and U.S. domestic cell cast is a good choice for applications that require the best. Imported cell cast acrylic is often manufactured to lesser standards. (Information copied from http://www.wisegeek.com/what-is-acrylic.htm)
Lexan: Polycarbonate is a versatile, tough plastic used for a variety of applications, from bulletproof windows to compact disks (CDs). The main advantage of polycarbonate over other types of plastic is unbeatable strength combined with light weight. While acrylic is 17% stronger than glass, polycarbonate is nearly unbreakable. Bulletproof windows and enclosures as seen inside banks or at drive-throughs are often made of polycarbonate. Add to this the advantage that polycarbonate is just one-third the weight of acrylic, or one-sixth as heavy as glass, and the only drawback is that it is more expensive than either acrylic or glass. Compact disks and digital versatile discs (DVDs) are perhaps the most readily recognized examples of polycarbonate. If you�ve ever archived files on a writable CD, then later tried to break it before throwing it away, you know just how tough polycarbonate can be! (Information taken from http://www.wisegeek.com/what-is-polycarbonate.htm)
Mesh: Is usually a PVC vinyl coated polyester yarn that is fade resistant. It has an open weave with a shade factor, depending upon the weave.
Plate Glass: Plate glass is a type of glass which is cast in a solid plate, typically through a roller process. The resulting glass is extremely flat and free of distortions. This type of glass is often used to make windows, and it is also utilized in the manufacture of mirrors, tables, and other objects which require extremely flat glass. There are a variety of different weights of plate glass available, ranging from incredibly thick and highly durable plate glass to more delicate varieties. To make plate glass, liquid glass is spread out on a metal table while it is still extremely hot, and then rollers are passed over the table to smooth and polish the glass as it cools, creating the desired uniform sheet of glass. Depending on the precise details of the manufacturing method, the glass may need to be polished again once it has cooled. Plate glass is also produced through a floating process, using a bath of molten tin to float liquid glass as it cools and sets. (Information taken from http://www.wisegeek.com/what-is-plate-glass.htm)
Fabric - Over the Seats: Some windscreens are made of various fabrics that fit onto the seats, wrapping around like an evelope.
Acrylic and Lexan windscreens are commonly fabricated by:
Router: A workshop router, following a template, is used to cut and shape a windscreen. The advantages are lower costs; the disadvantages are lower quality, nicks and rougher finishes, and not as precise.
CNC Router: A powerful router is controlled through a computer aided mechanical mechanism. This makes up for most of the disadvantages of a workshop router.
Water Jet: Water is pumped through high velocity and pressure, mixed with an abrasive substance.
Laser: Considered the best was to cut the material, a high wattage laser scores and cuts the material. With this, etchings and other diagrams are easily possible.
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