PC polycarbonate plastic is an almost colorless glassy amorphous polymer with good optical properties. PC high molecular weight resin has high toughness, Izod notch impact strength is 600~900J/m, heat distortion temperature of unfilled grades is about 130℃. Glass fiber can increase this value by ℃. Flexural modulus of PC can reach more than 2400MPa, resin can be processed into large rigid products.
Below 100℃, creep rate under load is very low. PC has poor hydrolysis resistance and cannot be used for products that are repeatedly subjected to high-pressure steam. PC material has flame retardancy, wear resistance and oxidation resistance.. Polycarbonate is colorless and transparent, heat-resistant, impact-resistant, flame-retardant BI grade, has good mechanical properties at ordinary temperatures.
Compared with performance close to polymethyl methacrylate, polycarbonate has good impact resistance, high refractive index and good processing performance. It has UL94V-0 flame retardant performance without additives. However, price of polymethyl methacrylate is lower than that of polycarbonate, and large-scale devices can be produced by bulk polymerization.

a. Mechanical properties: high strength, fatigue resistance, dimensional stability, and small creep (very few changes under high temperature conditions);
b. Heat aging resistance: enhanced UL temperature index reaches 120~140℃ (long-term outdoor aging is also very good);
c. Solvent resistance: no stress cracking;
d. Stability to water: easy to decompose in contact with water (use caution in high temperature and high humidity environments);
e. Electrical performance:
(1) Insulation performance: excellent (it can maintain stable electrical performance even under humidity and high temperature, it is an ideal material for manufacturing electronic and electrical parts);
(2) Dielectric coefficient: 3.0-3.2;
(3) Arc resistance: 120s
f. Molding processability: injection molding or extrusion molding by ordinary equipment. Due to fast crystallization speed and good fluidity, mold temperature is also lower than that of other engineering plastics. When processing thin-walled parts, it only takes a few seconds, and it only takes 40-60s for large parts.

 

Application and development of PC polycarbonate is developing in direction of high composite, high function, specialization and serialization. It has launched its own dedicated grades for various products such as optical discs, automobiles, office equipment, boxes, packaging, medicine, lighting, and films.
Optical lighting: used to manufacture large-scale lampshades, protective glasses, left and right eyepiece tubes of optical instruments, etc., and can also be widely used in transparent materials on airplanes.
Electronic and electrical appliances: Polycarbonate is an excellent E (120℃) grade insulating material, used to manufacture insulating connectors, coil frames, tube sockets, insulating sleeves, telephone shells and parts, and battery shells for miner’s lamps. It can also be used to make parts with high dimensional accuracy, such as optical discs, telephones, electronic computers, video recorders, telephone switches, signal relays and other communication equipment. Polycarbonate film is also widely used as capacitors, insulating bags, audio tapes, color video tapes, etc.
Mechanical equipment: used to manufacture various gears, racks, worm gears, worms, bearings, cams, bolts, levers, crankshafts, ratchets, as well as some mechanical equipment housings, covers, frames and other parts.
Medical equipment: cups, tubes, bottles, dental equipment, medicine containers, surgical instruments that can be used for medical purposes, can even be used as artificial organs such as artificial kidneys and artificial lungs.
Other aspects: used in construction as hollow rib double-wall panels, greenhouse glass, etc.; in textile industry as textile bobbins, textile machine bearings, etc.; in daily use as milk bottles, tableware, toys, models, LED lamp housings and mobile phone housings, etc.

English name: polytetrafluoro ethylene

1. It is a copolymer of a small amount of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene. Melt adhesion is enhanced, melt viscosity is reduced, and performance is unchanged compared with polytetrafluoroethylene. This resin can be directly processed into products by ordinary thermoplastic molding methods.
2. Long-term use temperature is -80-260 degrees. It has excellent chemical resistance, corrosion resistance to all chemicals, the lowest friction coefficient among plastics, and good electrical properties. Its electrical insulation is not affected by temperature. It is known as "Plastic King".
3. Its chemical resistance is similar to polytetrafluoroethylene and better than vinylidene fluoride.
4. Its creep resistance and compressive strength are better than PTFE, with high tensile strength and elongation of 100-300%. Good dielectric properties and excellent radiation resistance. Flame retardancy reaches V0 level. It is suitable for production of corrosion-resistant parts, wear-reducing and wear-resistant parts, seals, insulating parts and medical equipment parts.
5. High-temperature wire and cable insulation, anti-corrosion equipment, sealing materials, pump valve bushings, and chemical containers.

 

1. Crystal material, low moisture absorption. It can be processed into products by usual processing methods of thermoplastics.
2. Poor fluidity, easy to decompose, and produce corrosive gas during decomposition. It is advisable to strictly control molding temperature not to exceed 475 degrees, mold should be heated to 150-200 degrees, gating system should have low resistance to material flow.
3. Translucent pellets, injection molding and extrusion molding. Molding temperature is 350-400 degrees, and temperature above 475 degrees is likely to cause discoloration or bubbles. And note that demoulding will be more difficult.
4. Specific gravity: 2.13-2.167 g/cm3. Molding shrinkage: 3.1-7.7%
5. Because molten material has a corrosive effect on metal, mold needs to be electroplated with chrome for long-term production.