ABS Plastic
(Acrylonitrile Butadiene Styrene)
English name:Acrylonitrile Butadiene Styrene
Specific gravity:1.05 grams per cubic centimeter Molding shrinkage:0.4-0.7% Molding temperature:200-240℃. Drying condition:80-90℃ for 2 hours
Material properties 1, good overall performance, high impact strength, chemical stability, good electrical properties.
2, and 372 organic glass fusion good, made of two-color plastic parts, and can be surface chrome plating, spray paint treatment.
3, high impact, high heat resistance, flame retardant, enhanced, transparent and other levels.
4, mobility than HIPS a little worse than PMMA, PC, etc., good flexibility. Suitable for the production of general mechanical parts, wear parts, transmission parts and telecommunications parts.
Molding properties 1. Amorphous material, medium fluidity, moisture absorption, must be fully dry, the surface requires glossy plastic parts must be preheated and dried for a long time 80-90 degrees, 3 hours.
2. It is desirable to take a high material temperature, high mold temperature, but the material temperature is too high and easy to decompose (decomposition temperature of >270 degrees). For higher precision plastic parts, mold temperature should be taken 50-60 degrees, for high gloss. Heat-resistant plastic parts, mold temperature should be 60-80 degrees.
3, such as the need to solve the water folder pattern, need to improve the fluidity of the material, take high material temperature, high mold temperature, or change the water level and other methods.
4, such as forming heat-resistant grade or flame retardant grade materials, production 3-7 days after the mold surface will remain plastic decomposition, resulting in mold surface shiny, the mold needs to be cleaned up in a timely manner, at the same time, the mold surface needs to increase the exhaust position.
PS plastic
(Polystyrene)
English name:Polystyrene
Specific gravity:1.05g/cm3 Molding shrinkage:0.6-0.8% Molding temperature:170-250℃ Drying conditions:----
Material properties Excellent electrical insulation (especially high-frequency insulation). Colorless and transparent, light transmittance second only to organic glass, coloring resistance, water resistance, good chemical stability. General strength, but brittle, easy to produce stress cracking, not resistant to benzene. Not resistant to benzene, gasoline and other organic solvents. Suitable for the production of insulating transparent parts. Decorative parts and chemical instruments. Optical instruments and other parts.
Molding Properties 1. Amorphous material, moisture absorption is small, do not need to fully dry, not easy to decompose, but the coefficient of thermal expansion is large, easy to produce internal stress. It has good fluidity and can be molded by screw or plunger injection machine.
2. It is preferable to use high material temperature, high mold temperature, low injection pressure, extend the injection time is conducive to reducing the internal stress, to prevent shrinkage. Deformation.
3. Various types of gates are available, and the gates are connected with the molded parts in a circular arc to avoid damaging the molded parts when removing the gates. The demolding slope is large, and the ejection is even. The wall thickness of the molded part is even, and it is better not to bring any inserts, if there are inserts, they should be preheated.
PMMA plastic (plexiglass)
(Polymethyl Methacrylate)
English name: Polymethyl Methacrylate
Specific gravity: 1.18 g/cm3 Molding shrinkage: 0.5-0.7% Molding temperature: 160-230 ℃ Drying conditions: 70-90 ℃ 4 hours
The molding temperature: 160-230 ℃ Drying conditions: 70-90 ℃ 4 hours
The molding temperature is the same as the molding temperature. Hours
Material properties Excellent transparency, high strength, a certain degree of heat and cold resistance, corrosion resistance, good insulation, comprehensive performance than polystyrene, but brittle, easy to melt in organic solvents, such as light-transmitting materials, its surface hardness is slightly lower, easy to rub flowers. Suitable for the production of transparent insulating parts and general strength parts.
Molding properties 1. Amorphous material, moisture absorption, need to dry, not easy to decompose, medium fluidity, easy to fill the bad, sticky mold, shrinkage, fusion marks.
2. High-pressure injection is preferred to take high material temperature and high mold temperature under the condition of no defects, in order to increase the fluidity, reduce the internal stress, improve the transparency and strength. The surface of the mold casting system should be smooth, demolding slope, ejection uniform. At the same time, there is an exhaust port to prevent bubbling.
POM plastic
(Polyformaldehyde)
English name:Polyoxymethylene(Polyformaldehyde)
Specific gravity:1.41-1.43g/cm3 Molding shrinkage:1.2-3.0% Molding temperature:170-200℃ Drying condition:80-90℃ 2 hours
The surface of the mold casting system should be clean, the ejection is even. 90℃ 2 hours
Material properties Comprehensive performance is good, high strength and stiffness, good wear resistance, small water absorption, good dimensional stability, but poor thermal stability, easy to burn, easy to aging in the atmosphere. Suitable for the production of wear parts, transmission parts, as well as chemical, instrumentation and other parts
Molding properties 1.crystalline material, narrow melting range, melting and solidification of fast, the material temperature is slightly lower than the melting temperature of crystallization. The fluidity is medium. Moisture absorption is small, can not be dried.
2. Low coefficient of friction, good elasticity, easy to produce wrinkles on the surface of the plastic surface defects.
3. Very easy to decompose, decomposition temperature of 240 degrees. Decomposition of irritating and corrosive gases. Therefore, the mold steel should be selected corrosion-resistant material production.
PP plastic
(Polypropylene)
English name: Polypropylene
Specific gravity: 0.9-0.91 g/cm3 Molding shrinkage: 1.0-2.5% Molding temperature: 160-220 ℃ Drying conditions: ----
Material properties: low density, strength, stiffness, hardness, heat resistance are better than low-pressure steel. Heat resistance is better than low pressure polyethylene, can be used at about 100 degrees. It has good electrical properties and high-frequency insulation not affected by humidity, but it becomes brittle at low temperature and is not mold-resistant and easy to be aged. Suitable for the production of general mechanical parts, corrosion-resistant parts and insulating parts
Molding properties 1. crystalline material, hygroscopicity, easy to melt rupture, long-term contact with hot metal decomposition.
2. Good fluidity, but the shrinkage range and shrinkage value is large, easy to occur shrinkage holes. Dents, deformation.
3. Cooling speed, pouring system and cooling system should be slow heat dissipation, and pay attention to control the molding temperature. The material temperature is low, the direction of the direction is obvious. Low temperature and high pressure is especially obvious, mold temperature is lower than 50 degrees, the plastic is not smooth, easy to produce poor fusion, leaving traces, more than 90 degrees prone to warping and deformation
4. Plastic wall thickness should be uniform, to avoid the lack of glue, sharp corners, in order to prevent the concentration of stress.
PE plastic
(Polyethylene)
English name: Polyethylene
Specific gravity: 0.94-0.96 g/cm3 Molding shrinkage: 1.5-3.6% Molding temperature: 140-220 ℃ Drying conditions: ----
Material properties Corrosion resistance, electrical insulation (especially high frequency insulation) excellent. High-frequency insulation is excellent, can be chlorinated, irradiation modification, can be glass fiber reinforced. Low-pressure polyethylene has high melting point, rigidity, hardness and strength, low water absorption, good electrical properties and radiation resistance; high-pressure polyethylene has good flexibility, elongation, impact strength and permeability; ultra-high molecular weight polyethylene has high impact strength, fatigue resistance and wear resistance. Low-pressure polyethylene is suitable for the production of corrosion-resistant parts and insulating parts; high-pressure polyethylene is suitable for the production of film, etc.; ultra-high molecular weight polyethylene is suitable for the production of vibration-damping, abrasion-resistant and transmission parts.
Molding properties 1. crystalline material, moisture absorption, do not need to be fully dried, excellent fluidity flow is sensitive to pressure, molding is recommended to use high-pressure injection, material temperature uniformity, filling speed, holding pressure is sufficient. It is not suitable to use direct gating to prevent uneven shrinkage and increase of internal stress. Pay attention to choose the location of the gate to prevent shrinkage and deformation.
2. Shrinkage range and shrinkage value is large, the direction is obvious, easy to deformation and warping. Cooling rate should be slow, the mold is equipped with cold material cavity, and cooling system.
3. The heating time should not be too long, otherwise decomposition will occur, burns.
4. Soft plastic parts have shallow side grooves, can be forced to release the mold.
5. Melt rupture may occur, should not be in contact with organic solvents to prevent cracking.
Polyvinyl Chloride PVC
English name: Poly (Vinyl Chloride)
Specific gravity: 1.38 g/cm3 Molding shrinkage: 0.6-1.5% Molding temperature: 160-190 ℃ Drying conditions: ----
Material properties Mechanical properties, electrical properties, acid and alkali resistance is very strong. Good chemical stability, but low softening point. Suitable for the production of sheet, wire and cable insulation, seals and so on.
Molding properties 1. Amorphous material, moisture absorption, poor fluidity. In order to improve the fluidity, to prevent the occurrence of air bubbles, the plastic can be pre-dried. The mold casting system should be thick and short, the gate cross-section should be large, there should be no dead ends. The mold should be cooled and the surface should be chrome plated.
2. Very easy to decompose, at a temperature of 200 degrees and steel. It is easier to decompose when it comes in contact with steel and copper at 200 degrees Celsius, and corrosive and irritating gases will escape when it decomposes. Irritating gases are emitted during decomposition. Small molding temperature range.
3. Screw injection machine nozzle, the aperture should be large, to prevent dead-end stagnant material. Good without inserts, such as inserts should be preheated.
PA plastic (nylon)
(Polyamide)
English name: Polyamide
Specific gravity: PA6-1.14g/cm3 PA66-1.15g/cm3 PA1010-1.05g/cm3 Molding shrinkage: PA6-0.8-2.5% PA66-1.5 2.2% Molding temperature:220-300℃ Drying condition:100-110℃ for 12 hours
Material properties Toughness, abrasion resistance, oil resistance, water resistance, anti-enzymatic bacteria, but absorb water.
Nylon 6 has good elasticity, high impact strength, high water absorption
Nylon 66 has better performance than nylon 6, high strength, good abrasion resistance
Nylon 610 is similar to nylon 66, but water absorption is small, low stiffness
Nylon 1010 is semi-transparent, water absorption is small, good cold resistance. It is suitable for the production of general mechanical parts, wear-resistant parts, transmission parts, and chemical, electrical, and electrical appliances. Chemical industry, electrical appliances, instrumentation and other parts
Molding properties 1. Crystalline material, high melting point, melting temperature range is narrow, poor thermal stability, material temperature over 300 degrees, retention time of more than 30min that is decomposed. Easier to absorb moisture, need to dry, water content shall not exceed 0.3%.
2. Good fluidity, easy to overflow. Suitable for self-locking nozzle, and should be heated.
3. Molding shrinkage range and shrinkage rate is large, the direction is obvious, easy to occur shrinkage, deformation.
4. Mold temperature according to the wall thickness of the plastic parts in the range of 20-90 degrees selected, injection pressure according to the type of injection machine, material temperature, shape and size of the plastic parts, mold pouring system selected, molding cycle according to the wall thickness of the plastic parts selected. When the viscosity of the resin is small, the injection and cooling time should be longer, and white oil should be used as the mold release agent.
5. The form and size of the mold casting system, increase the size of the runner and gate can reduce shrinkage.
PC plastic
(Polycarbonate)
English name:Polycarbonate
Specific gravity:1.18-1.20g/cm3 Molding shrinkage:0.5-0.8% Molding temperature:230-320℃ Drying conditions:110-120℃ 8 hours
Material properties Impact High impact strength, good dimensional stability, colorless and transparent, good coloring, good electric insulation, corrosion resistance, good abrasion resistance, but poor self-lubrication, tendency to stress cracking, easy to hydrolyze at high temperatures, poor compatibility with other resins. Suitable for the production of instrumentation small parts, insulation and transparent parts and impact parts
Molding properties 1. Amorphous material, good thermal stability, wide range of molding temperature, poor fluidity. Moisture absorption is small, but sensitive to water, must be dried. Molding shrinkage is small, easy to melt cracking and stress concentration, so the molding conditions should be strictly controlled, the plastic parts must be annealed.
2. High melting temperature, high viscosity, greater than 200g of plastic parts, it is appropriate to use heated extension nozzle.
3. Cooling speed, mold pouring system to coarse, short for the principle, it is appropriate to set up a cold material well, the gate should be taken as a large, the mold should be heated.
4. Material temperature is too low will cause the lack of material, molded parts without luster, material temperature is too high easy to overflow edge, molded parts blistering. Mold temperature is low shrinkage, elongation, high impact strength, bending, compression, tensile strength is low. When the mold temperature exceeds 120 degrees Celsius, the cooling of plastic parts is slow, easy to deform and stick to the mold
PPO plastic (MPPO)
(polyphenylene ether)
English name: poly(phenylene oxide)
Specific gravity:1.07g/cm3 Molding shrinkage:0.3-0.8% Molding temperature:260-290°C. Drying condition:130°C for 4 hours. Drying condition:130℃ for 4 hours
Material properties 1.White granule. Good comprehensive performance, can be used in 120 degrees steam, good electrical insulation, small water absorption, but have a tendency to stress cracking. Modified polyphenylene ether can eliminate stress cracking.
2, has outstanding electrical insulation and excellent water resistance, good dimensional stability. Its dielectric properties of plastics in the first place.
3, MPPO for PPO and HIPS **** mixing of modified materials, currently on the market are such materials.
4, high heat resistance, glass transition temperature of 211 degrees, melting point of 268 degrees, heated to 330 degrees has a tendency to decompose, the higher the content of PPO the better its heat resistance, heat distortion temperature of up to 190 degrees.
5, good flame retardant, self-interested, and HIPS mixed with medium flammability. Lightweight, non-toxic can be used in the food and drug industry. Poor light resistance, long time use in the sun will change color.
6, can be mixed with ABS, HDPE, PPS, PA, HIPS, fiberglass and other **** modified processing. 1、It is suitable for making heat-resistant parts, insulating parts, wear-resistant parts, transmission parts, medical and electronic parts.
2, can be used for higher temperature gears, air blades, valves and other parts, can be used instead of stainless steel.
3, can make screws, fasteners and connectors.
4, motor, rotor, casing, transformer electrical parts.
Molding properties 1. Non-crystalline material, small moisture absorption.
2. Poor fluidity, similar to Newtonian fluids, viscosity is sensitive to temperature, the thickness of the product is generally more than 0.8 mm. Very easy to decompose, decomposition of corrosive gases. It is desirable to strictly control the molding temperature, the mold should be heated, the pouring system should be small resistance to material flow.
3, polyphenylene ether water absorption is very low 0.06% or so, but a trace of moisture will lead to the surface of the product silver and other non-smooth phenomena, it is best to make the drying process, the temperature should not be higher than 150 degrees, otherwise the color will change.
4, polyphenylene ether molding temperature of 280-330 degrees, modified polyphenylene ether molding temperature of 260-285 degrees.
PSU plastic
(Polysulfone)
English name:Polysulfone
Specific gravity:1.25-1.35 grams/cubic centimeter Molding shrinkage:0.5-0.7% Molding temperature:290-350 degrees Celsius Drying condition:130-150 degrees Celsius 4 hours
Material properties
/Use 1, polysulfone is amber transparent solid material, high hardness and impact strength, non-toxic, heat and cold resistance and aging resistance, can be used for a long time at -100--175 degrees. Resistant to corrosion of inorganic acids and alkali salts, but not resistant to aromatic hydrocarbons and halogenated hydrocarbons. Polyarylsulfone high hardness, radiation resistance, heat and cold resistance and good self-interest, can be used in -100-175 degrees for a long time.
2, through the glass fiber reinforced modification can make the material wear resistance greatly improved.
3, polysulfone and ABS, polyimide, polyether ether ketone and fluoroplastics can be made of polysulfone modified products, mainly to improve its impact strength and elongation, solvent resistance, environmental performance, processing performance and platability. Such as PSF/PBT, PSF/ABS, PSF + mineral powder. 1, suitable for the production of heat-resistant parts, insulation parts, wear parts, instrumentation parts and medical equipment parts, polyarylsulfone is suitable for the production of low-temperature parts.
2, polysulfone in the electrical and electronic industry is commonly used in the manufacture of integrated circuit boards, coil pipe racks, contactors, sets of shelves, capacitor film, high-performance alkaline battery shell.
3, polysulfone in household appliances used in microwave oven equipment, coffee heaters, wetter, hair dryer, cloth steamer, beverage and food distributor. Can also be used instead of non-ferrous metals for clocks and watches, photocopiers, cameras and other precision structural parts.
4, polysulfone has passed the U.S. pharmaceutical, food field of the relevant norms, can replace the stainless steel products. Due to the polysulfone steam resistance, hydrolysis resistance, non-toxic, high temperature steam sterilization, high transparency, good dimensional stability, etc., can be used as surgical tool trays, nebulizers, fluid controllers, cardiac valves, pacemakers, gas masks, dental brackets and so on.
Molding performance 1.amorphous material, moisture absorption, water absorption rate of 0.2%-0.4%, before use must be fully dry, and to prevent re-absorption of moisture. Ensure that the moisture content is below 0.1%.
2. Molding performance is similar to PC, poor thermal stability, 360 degrees when the decomposition begins.
3. Poor fluidity, fast cooling, suitable for high temperature and high pressure molding. The mold should have enough strength and rigidity, set up a cold material well, the runner should be short, the gate size to take the molded part wall thickness of 1/2-1/3
4. In order to reduce the internal stress of the injection molded products, the mold temperature should be controlled at 100-140 degrees. After molding can take annealing treatment glycerin bath annealing treatment, 160 degrees, 1-5 minutes; or take the air bath 160 degrees, 1-4 hours. Annealing time depends on the size of the product and wall thickness.
5. Polysulfone in the molten state close to the Newtonian body, similar to the polycarbonate, the mobility of the temperature-sensitive, in 310 degrees -420 degrees within the temperature rises 30 degrees every time, the mobility increased by a factor of one. Therefore, the molding is mainly by increasing the temperature to improve the processing fluidity.
PTFE plastic (F4)
(Polytetrafluoroethylene)
English name: Polytetrafluoro ethylene
Specific gravity: 2.1-2.2 g/cm3 Molding shrinkage: 3.1-7.7% Molding temperature: 330-380 ℃ Drying conditions: ----
Material properties 1, long-term use of temperature: 310 degrees - 420 degrees dry conditions:
Material properties 1, long-term use temperature -200--260 degrees, excellent chemical resistance, corrosion resistance to all chemicals, the lowest coefficient of friction in plastics, and very good electrical properties, its electrical insulation is not affected by the temperature, the "King of Plastics".
2, transparent or translucent state, the higher the crystallinity, the worse the transparency. Raw materials are mostly powdered resin or concentrated dispersion, with very high molecular weight, high crystallinity thermoplastic polymers. It is suitable for the production of corrosion-resistant parts, wear-resistant parts, seals, insulating parts and medical equipment parts
Molding Properties 1.Crystalline material, moisture absorption is small.
2. Poor fluidity, very easy to decompose, decomposition of corrosive gases. It is desirable to strictly control the molding temperature, the mold should be heated, and the resistance of the pouring system to the material flow should be small.
3. Powdered resin is often molded by powder metallurgy, using the sintering method. Sintering temperature 360-380 degrees, not more than 475 degrees. Emulsion resin is usually processed by cold extrusion and then sintering process, can be formed on the surface of the article anticorrosion layer. If you need to require product transparency, good toughness, should take a rapid cooling. Can also take extrusion molding, can be extruded tube, bar, profile.
4, PTFE melt viscosity is very high, the bulk viscosity with the increase in shear stress and decrease, showing its non-Newtonian fluid properties.
5, secondary processing, can be hot-pressing composite, welding, bonding, reinforcing, machining, etc., in order to produce the final product.
ASA Plastic
(Acrylic Styrene Acrylate)
English name:Acrylonitrile Styrene acrylate copolymer
Specific gravity:1.05g/cm3 Molding shrinkage:0.4-0.7% Molding temperature:170-230℃ Drying Conditions:80-90°C 2 hours
Material Properties ASA polymers are amorphous materials that can be extruded and injection molded into products that are extremely resistant to climatic influences. The mechanical properties of the ternary **** polymer ASA are generally similar to those of ABS resin, with the difference that ASA's properties are much less affected by outdoor weather than those of ABS resin. Suitable for the production of general construction areas, outdoor furniture, automotive exterior side mirror shell
Molding properties 1.amorphous material, medium fluidity, moisture absorption, must be fully dry, the surface requires glossy plastic parts must be a long time to preheat and dry 80-90 degrees, three hours.
2. It is desirable to take a high material temperature, high mold temperature, but the material temperature is too high and easy to decompose (decomposition temperature of >250 degrees). For higher precision plastic parts, mold temperature should be taken 50-60 degrees, the gloss. Heat-resistant plastic parts, mold temperature should be 60-80 degrees.
3. Marketed ASA basic resin brands are: Luran S brand (BASF Plastic Materials); Gelog brand (General Plastics); Centrex brand (Monsanto).
PPS plastic
(Polyphenylene sulfide)
English name: Phenylene sulfide
Specific gravity: 1.36 g/cm3 Molding shrinkage: 0.7% Molding temperature: 300-330 ℃ Drying conditions: ----
Material properties 1, electrical insulation (especially high-frequency insulation) Excellent, white, hard and brittle, fall on the ground with a metallic sound, light transmission rate is second only to organic glass, coloring resistance, water resistance, good chemical stability. It has excellent flame retardancy and is a non-combustible plastic.
2, general strength, rigidity is very good, but brittle, easy to produce stress cracking, not resistant to benzene. Gasoline and other organic solvents. Long-term use of temperature up to 260 degrees in 400 degrees of air or nitrogen to maintain stability. Through the addition of glass fiber or other reinforcing materials modified, the impact strength can be greatly improved, heat resistance and other mechanical properties have also been improved, the density increased to 1.6-1.9, molding shrinkage is small to 0.15-0.25% Suitable for the production of heat-resistant parts. It is suitable for making heat-resistant parts, insulating parts and chemical instruments. Optical instruments and other parts.
Molding properties 1. Amorphous material, moisture absorption is small, but should be dried after molding.
2. Fluidity between ABS and PC, fast solidification, shrinkage is small, easy to decompose, choose a higher injection pressure and injection speed. Mold temperature of 100-150 degrees. Main stream taper should be large, the runner should be short].
ETFE plastic
(Polytetrafluoroethylene-ethylene*** polymer)
English name:Polytetrafluoro ethylene
Special gravity:1.7g/cm3 Molding shrinkage:3.1-7.7% Molding temperature:300-330℃ Drying conditions:----
Material properties 1, long-term use temperature -80-220 degrees, excellent chemical resistance, corrosion resistance to all chemicals, the lowest coefficient of friction in plastics, and very good electrical properties, its electrical insulation is not affected by the temperature, the "King of Plastics".
2, its chemical resistance is similar to PTFE, better than vinylidene fluoride.
3, its creep resistance and compression strength are better than PTFE, high tensile strength, elongation up to 100-300%. Good dielectric properties, excellent radiation resistance. 1, suitable for the production of corrosion-resistant parts, wear parts, seals, insulation and medical equipment parts.
2, wire, cable insulation, anticorrosive equipment, sealing materials, pumps, valves, bushings, and chemical containers.
Molding properties 1. crystalline material, moisture absorption is small. It can be processed into products by the usual thermoplastic processing methods.
2. Poor fluidity, very easy to decompose, and produce corrosive gases when decomposing. It is advisable to strictly control the molding temperature does not exceed 350 degrees, the mold should be heated to 100-150 degrees, the casting system should be small resistance to material flow. Can be molded 0.7-0.8 mm thick thin-walled simple products.
3. Transparent pellets, injection molding, extrusion molding. Molding temperature of 300-330 degrees, 350 degrees or more easily cause discoloration or bubbles. High-speed, low-pressure molding is desirable, and note that demolding will be more difficult.
PFA plastic
(Soluble polytetrafluoroethylene)
English name:Polytetrafluoro ethylene
Specific gravity:2.13-2.167g/cm3 Molding shrinkage:3.1-7.7% Molding temperature:350-400 degrees Celsius Drying conditions:----
Material properties 1. p>Material properties 1, for a small amount of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene **** polymer. Melt adhesion is enhanced, the viscosity of the solution decreases, while the performance of the polytetrafluoroethylene compared with no change. This resin can be directly processed into products using ordinary thermoplastic molding methods.
2, the long-term use of temperature -80 - 260 degrees, excellent chemical resistance, corrosion resistance to all chemicals, the lowest coefficient of friction in plastics, and very good electrical properties, its electrical insulation is not affected by the temperature, there is a "king of plastics," the name.
2, its chemical resistance is similar to PTFE, better than vinylidene fluoride.
3, its creep resistance and compression strength are better than PTFE, high tensile strength, elongation up to 100-300%. Good dielectric properties, excellent radiation resistance. Flame retardant up to V0 level. 1, suitable for the production of corrosion-resistant parts, wear parts, seals, insulation and medical equipment parts.
2, high-temperature wire, cable insulation, corrosion-resistant equipment, sealing materials, pumps, valves, bushings, and chemical containers.
Molding properties 1. crystalline material, moisture absorption is small. It can be processed into products by the usual thermoplastic processing methods.
2. Poor fluidity, very easy to decompose, decomposition of corrosive gases. It is advisable to strictly control the molding temperature should not exceed 475 degrees, the mold should be heated to 150-200 degrees, the pouring system should be small resistance to material flow.
3. Translucent pellets, injection molding, extrusion molding. Molding temperature of 350-400 degrees, 475 degrees or more easily cause discoloration or bubbles. And note that demolding will be more difficult.
4, because the molten material has a corrosive effect on the metal, long-term production, molds need chrome plating treatment.
PAR plastic (U plastic)
(Polyarylate)
English name:
Specific gravity:1.2-1.26g/cm3 Molding shrinkage:0.8% Molding temperature:300-350℃ Drying condition:100-120℃-5hours
Material properties 1, is a transparent amorphous thermoplastic It is transparent amorphous thermoplastic, with excellent heat resistance, flame retardant and non-toxicity. It can be directly processed into products by ordinary thermoplastic molding methods.
2, has excellent thermal properties, in the 1.86MPA load, its heat distortion temperature up to 175 degrees, decomposition temperature of 443 degrees. Its various mechanical properties are less affected by temperature. 1, suitable for the production of heat-resistant, flame-resistant and high dimensional stability of electrical parts. Connector, coil frame, relay shell.
2, lighting parts. Can be made into transparent lampshades, illuminators, automobile reflectors and so on.
Molding Properties 1. As the wall thickness of the product increases, the molding shrinkage increases.
2. Moisture absorption is small, about 0.1-0.3%, but injection molding trace moisture will cause polyarylate decomposition. Therefore, the material must be dried before molding. Make its water content less than 0.02%.
Phenol-Formaldehyde Plastic
English name:Phenol-Formaldehyde(PF)
Specific gravity:1.5-2.0g/cm3 Molding shrinkage:0.5-1.0% Molding temperature:150-170℃
Material properties Phenol-Formaldehyde Plastic is a kind of hard and brittle thermosetting plastics, commonly known as Bakelite powder. It has high mechanical strength, tough and wear-resistant, dimensionally stable, corrosion-resistant, and excellent electrical insulation properties. Suitable for the production of electrical appliances, instrumentation insulation mechanism, can be used in hot and humid conditions
Molding properties 1. molding is better, but shrinkage and directionality is generally larger than the amino plastics, and contains moisture volatiles. Should be preheated before molding, molding process should be exhaust, not preheating should be increased mold temperature and molding pressure.
2. Mold temperature has a large impact on the fluidity, generally more than 160 degrees, the fluidity will drop rapidly.
3. The hardening speed is generally slower than that of aminoplastics, and the heat released during hardening is large. Large thick-walled plastic parts of the internal temperature is easy to be too high, easy to harden unevenly and overheating.
Aminoplastics
English name:MF,UF
Specific gravity:1.5g/cm3 Molding shrinkage:0.6-1.0% Molding temperature:160-180℃
Material properties Arc-resistant and good electrical insulation, water resistance, heat resistance, suitable for compression molding Suitable for the production of arc-resistant electrical parts and explosion-proof appliances. Insulation
Molding properties 1. good fluidity, fast hardening speed, so the preheating and molding temperature should be appropriate, coating, mold and pressurization speed should be fast.
2. Molding shrinkage.
3. Containing more moisture volatiles, easy to absorb moisture, caking, molding should be preheated and dry, and to prevent re-absorption of moisture, but too dry is the decline in mobility. Molding moisture and decomposition of substances, acidic, molds should be chrome-plated to prevent corrosion, molding should be exhaust.
4. Molding temperature has a greater impact on the quality of plastic parts, the temperature is too high, easy to decomposition, discoloration, bubbles uneven color, the temperature is too low when the liquidity is poor, not glossy.
5. Material fine, specific volume, material in the inflatable more, with the pre-pressure ingot molding large plastic parts, easy to produce ripples and streamers, so generally should not be used
Epoxy resin (EP)
English name: Epoxide Resin
Specific gravity: 1.9 g / cm3 Molding shrinkage: 0.5% Molding temperature: 140-170 ℃.
Material properties Mechanical properties, electrical insulation, chemical stability, good adhesion to many materials, but the performance is affected by the filler species and content. The heat resistance of alicyclic cluster epoxy plastic is high. Suitable for casting molding and low-pressure extrusion molding Suitable for the production of electrical and electronic components and coil potting and fixing, can also be used for repair
Molding properties 1. Good fluidity, small hardening shrinkage, but poor thermal rigidity, not easy to demold.
2. Fast hardening, hardening generally do not need to exhaust, should be pressurized immediately after loading.
Silicone plastic (IS)
English name: Silicone
Specific gravity: 1.75-1.95 g/cm3 Molding shrinkage: 0.5% Molding temperature: 160-180 ℃
Material properties Resistant to high and low temperatures, good resistance to water, good high-frequency insulation, good resistance to radiation, good resistance to ozone Suitable for the production of electricians, Potting and fixing of electronic components and coils
Molding Properties 1. Good fluidity, slow hardening speed, compression molding requires a higher molding temperature.
2. After compression molding, it has to be cured by high temperature.