Polycarbonat PC polycarbonate
Application: Polycarbonate is used for such purposes. security guards, maskinafskærmning, cabs, bulletproof windows, eaves, signs, cabinets, safety glass, politiskjolde, mobile phones, electrical equipment, food containers.
Fire: Hard ignitable, and off shortly after the start of ignition.
Bending: PC is well to succumb to warm goat machines.
Plates can be koldbukkes ( i alm. bending machine for steel) in radii corresponding to the plate thickness, bending zone will contain high voltages. Cold Bent topics should be mechanically restrained , because over time they will abide something back.
Electrical properties: PC`s good electrical insulation values, combined with severe flammability and resistant to moisture makes the material used for electrical applications.
Physiological properties: A computer can be used in contact with food. Rules can be found at FDA and BGA.
History: Polycarbonate was first discovered in 1898 that Einhorn, one German Chemist, observed the presence of an insoluble infusible substance, In her work, responding hydrogens with phosgener. I 1902, Bischoff and Hedenström obtained corresponding cross-linked, High-molycylar-weight polycarbonate; Dr WH Carothers continued work on this. I 1953 Manufacturer Bayer laboratory, a linear thermoplastic polycarbonate high molycylar weight. Dr. H. Quick fra Bayer AG (Makrolon) and D. W.. Fox fra General Electric (Lexan) announced 1957, independently of one another, development of PC, and in summer 1960 both began commercial production companies.
Identification fire test:
Burns with a slight sooting, blisters up, yellowish flame, tan, glowing ash. Smells sweetish (partially self-extinguishing).
Trade names: MAKROLON ® , LEXAN ® Thermoclear®, Gepax®
Xantar® is the trade name for mixtures of PC and ABS. Stapron E is the trade name for mixtures of PC with polyester.
Category: Cool amorphous transparent thermoplastic.
Chemical resistance: PC is resistant to dilute acids, the general petroleum products, alcohol, alifaliske hydrocarbons, However, not stronger solvents. base, benzene and ozone will usually attack the PC.
Longer contact with the hot water of 60 ° C is not recommended. Strong tension with an attacking medium can be devastating for the material.
Delivery: sheets , tube, rods, welding wire
Bonding: Before gluing surfaces should be cleaned. Adhesion with ethylene chloride or methylene chloride solvent is suitable for small parts with small fugetykkelse.Efter few seconds, push the pieces together and set to curing in a convection oven. For larger items may be added in the solvent 5-10 % polycarbonate chips. A two-component epoxy adhesive can be used for bonding thicker grout, or gluing PC from other material.
Mechanical properties: Very high impact strength, coupled with good strength and stiffness, which varies little throughout the application temperature range. Even at high loads PC has little tendency to cold flow. Measure stability is better than semi-crystalline materials. The allowable deflection should not exceed 1 % by drawing.
Polycarbonate is easy to scratch , and often coated with a hard surface.
Optical properties: Lystransmissionsgrad by DIN 5036-1 is 88 % by 1 mm thickness, beregningstal to ISO 489-A is 1,586 by 1 mm. thickness.
Surface treatment: Painting or printing can be used. Certain paints may contain solvents such as PC is not resistance.
Polycarbonate is easy to scratch , and therefore often coated with a hard surface.
Holm & Holm has produced machines for UV varnishing, inter alia. display for mobile phones.
Polishing: Polishing can be made with alkali free polishing paste.
Assembly (mechanical): screws, rivets and the like. Tensions may arise as a result of thermal expansion. Click Collections are very suitable.
Cutting: Cooling with compressed air or water ; Do not use cutting oil or similar.
Hard roughing can cause internal tensions. Seamless punching up to about. 2mm plate thickness. For larger sheet thickness, heating may be necessary, that. 135 °C, the hole diameter changes by cooling.
Welding: Welding: All welding methods. Heat Mirror infrared 390-410 ° C. Hot gas welding 450-500OC., tensions caused by long welds. Friction welding, dried prior to welding in 12 hours at 120-130 ° C. Tension is released after welding at 110-140 ° C.
Thermal Properties. Extremely high impact strength, even at low temperatures
PC can be used up to approximately. 130 °C. Er as Glasovergangstemperaturovergangen. 152 °C.
UV- Stability: PC is attacked by UV light, However, the plates often stabilized against this.
Thermoforming(Termoformning): The plates should wilt in thermoforming. The material is tough to shape and can not be formed into very deep or sharp features complicated shapes.