Polycarbonate materials give you a balance of useful features which include high temperature resistance, impact resistance and optical properties position polycarbonates between commodity plastic materials and engineering plastic materials.
Polycarbonate is a very long-lasting material. Whilst it offers high impact-resistance, it's got low scratch-resistance and so a hard coating is often applied to polycarbonate eyewear lenses as well as polycarbonate exterior automobile components. The characteristics of polycarbonate tend to be like those of polymethyl methacrylate (PMMA, acrylic), although polycarbonate is stronger, it is usable in a wider temperature range and is a bit more expensive. This plastic polymer is highly transparent to visible light and it has better light transmission characteristics than most grades of glass.
Polycarbonate has a glass transition temperature of around 150 °C (302 °F), so it softens slowly above this point and flows above about 300°C (572 °F). Tools should be held at warm to high temperatures, generally above 80 °C (176 °F) to help with making strain- and stress-free products.
Unlike most other thermoplastics, polycarbonate can undergo massive deformations without cracking. As a result, it can be processed and formed cold using sheet metal techniques, for instance forming bends with a brake. Even for sharp angle bends having a tight radius, no heating is generally necessary. This makes it valuable in prototyping applications where transparent or electrically non-conductive parts are required, which may not be crafted from sheet metal. Understand that PMMA/Plexiglas, that is certainly similar in looks to polycarbonate, but it's brittle and cannot be bent at room temperature.
The light weight of polycarbonate, compared with glass, has led to advancement of electronic view screens that replace glass with polycarbonate, for use in mobile and portable devices. Such displays include newer e-ink and several LCD screens, though CRT, plasma screen and other LCD technologies still generally require glass for its higher melting temperature and its ability to be etched with finer detail.
Other types of items manufactured from Polycarbonate include durable, lightweight luggage, MP3/digital audio player cases, computer cases, police riot shields, instrument panels, and common style blender jars. Many toys and hobby items are manufactured from polycarbonate parts, e.g. fins, gyro mounts, and flybar locks for use with radio-controlled helicopters.
For use in applications exposed to weathering or UV-radiation, a special surface treatment could be needed. This can be a coating (e.g. for improved abrasion resistance), or a coextrusion for enhanced weathering resistance.
The Makrolon Polycarbonate is a thermoplastic that starts as a solid plastic material in the form of small pellets. In a manufacturing process called injection molding, the pelletized resin is heated until they melt and become a very thick liquid. The melted liquid polycarbonate is then rapidly pushed into molds, compressed under high pressure and cooled to produce a finished product in less than a minute.
local engineering plastic materials
No comments:
Post a Comment