Polycarbonate Sales Near Washington DC, Call Tammy Sagastume 410 804 2605 For Consultations Tammy Sagastume plastic solutions for various industries. Polycarbonates (PC) are a group of thermoplastic polymers containing carbonate groups in their chemical structures.
Polycarbonate sheets are a durable material. Although it has high impact resistance, it has low scratch resistance.
Therefore, a hard coating is applied to polycarbonate eyewear lenses and polycarbonate exterior automotive components. The characteristics of polycarbonate compare to those of polymethyl methacrylate (PMMA, acrylic), but polycarbonate is stronger and will hold up longer to extreme temperature.
The thermally processed material is usually totally amorphous, and as a result, is highly transparent to visible light, with better light transmission than many kinds of glass.
Polycarbonate has a glass transition temperature of about 147 °C (297 °F), so it softens gradually above this point and flows above about 155 °C (311 °F). Tools must be held at high temperatures, generally above 80 °C (176 °F), to make strain-free and stress-free products.
Low molecular mass grades are easier to mold than higher grades, but their strength is lower as a result. The toughest grades have the highest molecular mass but are more difficult to process.
Unlike most thermoplastics, polycarbonate can undergo large plastic deformations without cracking or breaking.
As a result, it can be processed and formed at room temperature using sheet metal techniques, such as bending on a brake.
Even for sharp angle bends with a tight radius, heating may not be necessary.
This makes it valuable in prototyping applications where transparent or electrically non-conductive parts are needed, which cannot be made from sheet metal. PMMA/Acrylic, which is similar in appearance to polycarbonate, is brittle and cannot be bent at room temperature.
Main transformation techniques for polycarbonate resins:
extrusion into tubes, rods, and other profiles, including multiwall
extrusion with cylinders (calenders) into sheets (0.5–20 mm (0.020–0.787 in)) and films (below 1 mm (0.039 in)), which can be used directly or manufactured into other shapes using thermoforming or secondary fabrication techniques, such as bending, drilling, or routing. Due to its chemical properties, it is not conducive to laser-cutting.
injection molding into ready articles
Polycarbonate may become brittle when exposed to ionizing radiation above 25 kGy (J/kg).
Polycarbonates used in engineering are strong, tough materials, and some grades are optically transparent. They are easily worked, molded, and thermoformed. Because of these properties, polycarbonates find many applications. Polycarbonates do not have a unique resin identification code (RIC) and are identified as “Other” 7 on the RIC list. Products made from polycarbonate can contain the precursor monomer bisphenol A (BPA).
Carbonate esters have planar OC(OC)2 cores, which confers rigidity. The unique O=C bond is short (1.173 Å in the depicted example), while the C-O bonds are more ether-like (the bond distances of 1.326 Å for the example depicted).
Polycarbonates received their name because they are polymers containing carbonate groups (−O−(C=O)−O−). A balance of useful features, including temperature resistance, impact resistance, and optical properties, positions polycarbonates between commodity plastics and engineering plastics.
Polycarbonate Sales Near Washington DC