Brief Introduction of plastic raw materials

Date：2012-03-08 11:39:23

1, PP plastic
(Polypropylene)
English name: Polypropylene
Gravity :0.9-0.91 grams / cubic centimeter molding shrinkage rate 2.5% 1.0 - the molding temperature :160-220 ℃
Material properties density, strength stiffness, hardness, heat resistance are superior to low-pressure polyethylene, can be used at 100 degrees has good electrical properties and high-frequency insulation from humidity, but the low temperature embrittlement, impatient mode easy to aging. for production of general machinery parts, corrosion-resistant parts and insulating parts
Forming properties of 1 crystalline material, moisture absorption, prone to melt fracture, long-term and thermal decomposition of metal contacts easily .2 Liquidity is good, but the range contraction and shrinkage value is large, prone to shrinkage. Dents, deformation .3 The cooling speed, pouring and cooling system, cooling system should be slow and pay attention to control the molding temperature material with low temperature the direction of directional apparent at low temperature is particularly evident when high pressure, mold temperature is below 50 degrees, the plastic is not smooth, easy to produce fusion poor, leaving marks, 90 degrees prone to warpage 4 plastic wall thickness to be uniform to avoid the lack of plastic, sharp corners to prevent stress concentration.

2, PE plastic
(Polyethylene)
English name: Polyethylene
Gravity :0.94-0 .96 g / cc molding shrinkage :1.5-3.6% molding temperature :140-220 ℃
Resistant to corrosion of materials, electrical insulation (especially high-frequency insulation) Excellent, can chlorination, radiation modification, can be glass fiber reinforced. LDPE melting point, rigidity, hardness and high strength, water absorption, have good electrical properties and radiation resistance; high pressure polyethylene flexibility, elongation, impact strength and good permeability; ultra-high molecular weight polyethylene high impact strength, fatigue resistance, wear-resistant. suitable for production of low-pressure polyethylene corrosion-resistant parts and insulating parts; suitable for production of high-pressure polyethylene film, etc.; ultra-high molecular weight polyethylene for the production shock, wear and transmission parts.
Forming properties of 1 crystalline material, moisture absorption is small, do not need to fully dry, excellent liquidity for liquidity pressure sensitive, high-pressure injection molding when it is appropriate, the material temperature uniformity, fast filling, packing full. Should not use the direct gate to prevent uneven shrinkage, internal stress increases. pay attention to selecting gate locations, prevent shrinkage and deformation. 2. contraction range and shrinkage large, clear direction, deformation warping. cooling rate should be slow, cold mold material set points, and a cooling system. 3. heating time not too long, otherwise it will decompose, burn 4. soft plastic parts are lighter side groove, it can forcibly stripping. 5 melt rupture may occur, exposure to organic solvents should not prevent cracking.

3, PVC
English name: Poly (Vinyl Chloride)
Weight: 1.38 grams / cubic centimeter molding shrinkage 0.6 - 1.5% molding temperature :160-190 ℃
Mechanical properties of materials properties, excellent electrical properties, a strong acid strength, chemical stability, but the softening point is low. For making sheet metal, wire and cable insulation and seals.
Formability 1 amorphous material, moisture absorption is small, illiquid order to improve mobility, prevent the occurrence of bubbles, plastic can be pre-drying, mold casting system should be chunky, large gate cross-section should not be dead. Tooling to be cooled, the surface chrome .2. vulnerable to decomposition, at 200 degree temperatures and steel contact with more copper, the decomposition when the escape corrosion irritant gases. forming a small temperature range of .3. using screw-type injection machine nozzle, the aperture should be large to prevent stagnation of dead material. no better with the inserts, where inserts should be preheated.

4, ABS plastic
(Acrylonitrile - butadiene - styrene)
English Name: Acrylonitrile Butadiene Styrene
Weight: 1.05 grams / cubic centimeter molding shrinkage 0.4-0.7% molding temperature :200-240 ℃ dry conditions :80-90 ℃ 2 小时
Performance of a material, better overall performance, high impact strength, chemical stability, good electrical properties. 2, and 372 glass of good welding, plastic parts made of color, and can be chrome plated, paint treatment .3, have high impact, high heat resistance, flame retardant, enhanced level of transparency and so on. 4, more mobile than HIPS almost, than PMMA, PC and other good, good flexibility. Suitable for production of general machinery parts, reducing wear resistant parts, transmission parts and telecommunications components.
Formability 1 amorphous materials, liquid medium, large moisture, must be fully dry, the surface gloss of the plastic parts required to be dry and warm-up time 80-90 degrees, 3 hours .2. Should take the high melt temperature, mold temperature high However, high temperature materials decompose (decomposition temperature> 270 degrees). for high precision plastic parts, mold temperature should take 50-60 degrees, high gloss heat-resistant plastic parts, mold temperature should take 60-80 degree 3, Watermark folder for solutions, the need to improve material flow, material to high temperature, high mold temperature, or change into water and other methods. 4, such as forming heat-or flame-retardant grade material, production 3-7 days after the remnants of the plastic mold surface decomposition, leading to the mold surface shiny, take time to clean up the mold, the mold surface, while the need to increase the exhaust position.

5, PS plastic
(Polystyrene)
English name: Polystyrene
Weight: 1.05 grams / cubic centimeter molding shrinkage 0.6 - 0.8% molding temperature :170-250 ℃
Performance of electric insulation material (especially the high-frequency insulation) fine, colorless and transparent, the transmittance behind plexiglass, color of water resistance, chemical stability, good. Strength in general, but the crisp, easy to produce brittle fracture stress , impatience benzene. gasoline and other organic solvents. Suitable for production of insulating transparent pieces. decorative pieces and chemical equipment. optical instruments and other parts.
Formability 1 amorphous material, moisture absorption is small, do not need to fully dry and difficult to break down, but the thermal expansion coefficient, easy to produce stress. Good liquidity available screw or plunger-type injection molding machine .2. Suitably high melt temperature, high mold temperature, low injection pressure, injection time to extend help to reduce stress, prevent shrinkage. deformation .3. available in various forms gate, gate arc connected with the plastic parts, so as not to damage the place to go when the gate plastic parts. stripping slope large, the top evenly. plastic wall thickness, preferably with no inserts, where inserts should be preheated.

6, PMMA plastic (PMMA)
(Poly-methyl methacrylate)
English name: Polymethyl Methacrylate
Weight: 1.18 grams / cubic centimeter molding shrinkage rate 0.5-0.7% molding temperature :160-230 ℃
Excellent material properties of transparency, higher strength, a certain degree of heat, cold resistance, corrosion resistance, good insulation, overall performance than polystyrene, but brittle, fusible in organic solvents, such as for translucent materials, the slightly lower surface hardness, scratch easily. Suitable for production of transparent insulation parts and the general strength of the parts.
Formability 1 amorphous material, moisture large, need to dry and difficult to break down, liquidity medium, prone to bad filling, viscous modulus, shrinkage, weld, etc. .2. Should be high-pressure injection, the condition does not appear to take a high defect melt temperature, high mold temperature, in order to increase liquidity, reduce stress, improve transparency and strength. mold casting system surfaces should be smooth, stripping slope large, top out evenly, while the exhaust port is located, to prevent blistering.
7, POM plastic (POM)
English name: Polyoxymethylene (Polyformaldehyde)
Gravity :1.41-1 .43 g / cc molding shrinkage :1.2-3 .0% molding temperature :170-200 ℃
Overall performance is better material properties, strength, high stiffness, good wear resistance by grinding, water is small, dimensional stability, but poor thermal stability, easy to burn easily in the atmosphere exposure aging. Suitable for production of anti-friction wear-resistant parts, transmission parts, and chemicals, instruments and other parts
Forming properties of 1 crystalline material, melting range is narrow, fast melting and solidification, the material temperature is slightly lower than the melting temperature of crystallization occurs. Liquid medium. Moisture absorption is small, may, without drying. (2) low coefficient of friction, elasticity, wrinkles plastic surface is easy to produce patterns of surface defects. 3 easy to the decomposition temperature of 240 degrees. Decomposition of the irritating and corrosive gases. Therefore, the mold should be selected steel corrosion-resistant materials.

8, PA plastic (nylon)
(Polyamide)
English name: Polyamide
Weight: PA6-1.14 grams / cubic centimeter PA66-1.15 grams / cubic centimeter PA1010-1.05 grams / cubic centimeter molding shrinkage: PA6-0.8-2.5% PA66-1.5-2.2% molding temperature :220-300 ℃
Materials performance and tough, abrasion resistance, oil, water, anti-bacterial enzymes, but a large absorbent nylon 6 with good elasticity, high impact strength, water absorption greater performance than nylon 6 nylon 66, high strength, wear resistance of nylon 610 and nylon 66 similar, but the water is small, low stiffness 1010 translucent nylon, water is small, cold is better suited to production of general machinery parts, reducing wear resistant parts, transmission parts, as well as chemical, electrical, instrumentation and other parts
Forming properties of 1 crystal material, a high melting point molten narrow temperature range, thermal stability, the material temperature over 300 degrees, the residence time is more than 30min break. Moisture more easily, be dry, moisture content shall not exceed 0.3% .2 The mobile is good, easy to flash. Self-locking when the nozzle is preferred, and should be heated. 3 range of molding shrinkage and shrinkage rate is high, clear direction, prone to shrinkage and deformation. 4 plastic mold wall temperature by 20-90 degrees in the range of selection, injection pressure by injecting machine type, material temperature, shape and size of plastic parts, die casting system selected, the wall thickness of plastic parts by molding cycle selected. Resin viscosity hour, injection, cooling should take a long time, and with white oil as a release agent. 5 mold gating system in the form and size, increasing the flow channel and the gate size can be reduced shrinkage.

9, PC Plastic
(Polycarbonate)
English name: Polycarbonate
Gravity :1.18-1 .20 g / cc molding shrinkage :0.5-0 .8% Molding temperature :230-320 ℃
High impact strength material properties, dimensional stability, colorless transparent, colored, good electrical insulation, corrosion resistance, wear resistance, but poor self-lubricating, a tendency to stress cracking, high temperature easy hydrolysis, compared with other resin solubility difference. Instrument for making small parts, pieces of insulating transparent and impact-resistant parts
Formability 1 amorphous material, good thermal stability, forming a wide temperature range, poor mobility. Moisture absorption is small, but sensitive to water, subject to drying. Molding shrinkage is small, prone to cracking and melting stress concentration, so the conditions should be strictly controlled molding, plastic parts subject to annealing. (2) the high melting temperature, high viscosity, greater than 200g of plastic parts, it is appropriate extension of the nozzle heating. 3 cooling speed, die casting system with coarse, short of the principle of cold material should be established well, should take the big gate, mold should be heated. 4 the material temperature is too low will result in lack of material, plastic parts dull, too easy to overflow while the material temperature, plastic bubble. Mold temperature and low shrinkage, elongation, impact strength, flexural, compressive strength, tensile strength is low. Mold temperature over 120 degrees, slow cooling of plastic parts, easy to stick mold deformation

10, PPO plastic (MPPO)
(Polyphenylene ether)
English name: poly (phenylene oxide)
Weight: 1.07 grams / cubic centimeter molding shrinkage :0.3-0 .8% Molding temperature :260-290 ℃
Performance of a material for the white particles. Good overall performance, can be used in 120-degree steam, electrical insulation, and water is small, but there is tendency to stress cracking. Noryl eliminate stress cracking. 2, with outstanding electrical insulation and excellent water resistance, good dimensional stability. The dielectric properties of the first home plastic. 3, MPPO for the PPO and HIPS blends obtained modified material, the material currently on the market are such materials. 4, a higher heat resistance, glass transition temperature of 211 degrees, the melting point of 268 degrees, heated to 330 degrees have tendency to break down, PPO content the better the higher the heat, heat distortion temperature of up to 190 degrees. 5, good flame-retardant, self-interest of, and HIPS mixed with moderate flammability. Light weight, non-toxic for food and drug industries. Poor light, for a long time in the sun will change. 6, with ABS, HDPE, PPS, PA, HIPS, etc. Blending glass fiber processing. 1, suitable for production of heat-resistant parts, insulation, anti-friction wear-resistant parts, transmission parts, medical and electronic components. 2, can be used for high temperature use gears, blades, valves and other parts can be used instead of stainless steel. 3, can be made screws, fasteners and connectors. 4, motor, rotor, housing, electrical transformer parts.
Forming properties of 1 non-crystalline materials, moisture absorption small. 2 poor mobility, for a similar Newtonian fluid, the viscosity is temperature sensitive products, thickness 0.8 mm. Easily decomposed when corrosive gases. To strictly control the molding temperature, the mold should be heated, gating system flow resistance of the material should be small. 3, polyphenylene ether, low water absorption of about 0.06%, but small amounts of moisture will cause the product to the surface of silver and other non-smooth phenomena, it is best for drying, the temperature not higher than 150 degrees, otherwise the color will change. 4, polyphenylene ether temperature of 280-330 degrees molding, modified polyphenylene ether molding temperature of 260-285 degrees.

11, PSU plastic
(Polysulfone)
English name: Polysulfone
Gravity :1.25-1 .35 g / cc molding shrinkage rate 0.7% 0.5-forming temperature :290-350 ℃
Material properties / uses 1, polysulfone amber transparent solid material, hardness and impact strength, non-toxic, heat aging resistance, cold resistance, and can be -100--175 degree of long-term use. Corrosion-resistant inorganic acid salt, but the impatience of aromatic hydrocarbons and halogenated hydrocarbons. Aromatic sulfone, high hardness, resistance to radiation, heat and cold is good and self-interest of, -100-175 degrees in long-term use. 2, modified by the glass fiber-reinforced materials can significantly improve the wear resistance. 3, can be polysulfone with ABS, polyamide imino, PEEK and polysulfone made of fluorine plastic modified product, mainly to improve the impact strength and elongation, solvent resistance, environmental performance, processing performance and electroplating. If PSF / PBT, PSF / ABS, PSF + mineral powder. 1, suitable for production of heat-resistant parts, insulation, anti-friction wear-resistant parts, instrument parts and medical equipment parts, suitable for production of low-temperature poly aryl sulfone working parts. 2, polysulfone commonly used in electrical and electronic industry in the manufacture of integrated circuit board, coil tube frame, contactors, sets of planes, thin-film capacitors, high-performance alkaline battery case. 3, polysulfone is used in household appliances in the microwave oven equipment, coffee heater, humidifier, hair dryer, cloth evaporated machine, beverage and food distributor, etc. Instead of non-ferrous metals can also be used for watches and clocks, copiers, cameras and other precision structural parts. 4, polysulfone has passed the U.S. pharmaceutical, food and relevant norms of the field, can replace stainless steel products. As the vapor-resistant polysulfone, hydrolysis, non-toxic, high temperature steam sterilization, high transparency, good dimensional stability, etc., can be used as surgical tools disk, sprayers, fluid control, heart valves, pacemakers, respirators, Denture and so on.
Formability 1 amorphous material, large moisture, water absorption 0.2% -0.4%, to be fully dried before use, and prevent further moisture. Ensure that the water content below 0.1%. (2) forming properties similar to the PC, thermal stability, 360 degrees began to decompose. 3 poor mobility, cooling fast, to use the high-temperature high-pressure molding. Mold should have sufficient strength and stiffness, cold slug well established, flow should be short, gate size, wall thickness 1/2-1/34 take the plastic parts. To reduce the internal stress produced plastic products, mold temperature should be controlled 100-140 degrees. Annealed after forming to annealing of glycerol bath, 160 degrees, 1-5 minutes; or air bath of 160 degrees to take 1-4 hours. Annealing time depends on product size and wall thickness. 5 polysulfone in the molten state is close to Newtonian, similar to polycarbonate, since mobility is sensitive to temperature, 310 degrees at -420 degrees, the temperature is increased by 30 degrees, liquidity doubled. Therefore, the main molding process by increasing the temperature to improve liquidity.

12, PTFE plastic (F4)
(PTFE)
English name: Polytetrafluoro ethylene
Gravity :2.1-2 .2 grams / cubic centimeter molding shrinkage :3.1-7.7% molding temperature :330-380 ℃
Performance of a material, long-term use temperature -200--260 degree, have excellent chemical resistance, for all chemicals are corrosion-resistant, lowest coefficient of friction in the plastic, as well as good electrical properties, the electrical insulation is not affected by temperature, the "plastics king," said. 2, the transparent or translucent state, the higher the degree of crystallinity, transparency worse. Powdered resin, or raw materials are mostly concentrated dispersions, with a high molecular weight, high crystallinity of the thermoplastic polymer. Suitable for production of corrosion-resistant parts, reducing wear resistant parts, seals, insulation, and medical equipment parts
Forming properties of 1 crystalline material, moisture absorption small. 2 poor mobility, easily decomposed when corrosive gases. To strictly control the molding temperature, the mold should be heated, gating system flow resistance of the material should be small. 3 is often used powdered resin molding powder metallurgy method, the use of sintering. Sintering temperature of 360-380 degrees, should not exceed 475 degrees. Emulsion resin is usually cold extrusion process and then sintering process can be formed on the surface coating materials. To request product transparency, toughness, rapid cooling should be taken. Also be taken extrusion, can be extruded tubes, rods, profiles. 4, PTFE high melt viscosity, volume viscosity with increasing shear stress decreases, indicating non-Newtonian fluid characteristics. 5, secondary processing, hot pressing can be complex, welding, bonding, enhance, machining, etc., to the final product obtained.

13, ASA plastic
(Acrylic - Styrene - Acrylonitrile)
English Name: Acrylonitrile Styrene acrylate copolymer
Weight: 1.05 grams / cubic centimeter molding shrinkage 0.4-0.7% molding temperature :170-230 ℃
ASA is a polymer material properties of amorphous materials, can be made using extrusion and injection molding has an excellent resistance to climate impact of products. ASA terpolymer is usually similar to the mechanical properties of ABS resin, the difference is the performance by the ASA outdoor climate is much smaller than the ABS resin. Suitable for production of general construction areas, outdoor furniture, car shell outside mirrors
Formability 1 amorphous materials, liquid medium, large moisture, must be fully dry, the surface gloss of the plastic parts required to be dry and warm-up time 80-90 degrees, 3 hours .2. Should take the high melt temperature, mold temperature high However, high temperature materials decompose (decomposition temperature> 250 degrees). for high precision plastic parts, mold temperature 50-60 degrees should take on gloss. heat-resistant plastic parts, mold temperature 60-80 degrees should be taken 3 The market sold ASA basic resin grades are: Luran S card (BASF Plastic Materials); Gelog card (Universal Plastics); Centrex brand (Monsanto).

14, PPS plastic
(PPS)
English name: Phenylene sulfide
Weight: 1.36 grams / cubic centimeter molding shrinkage: 0.7% of the molding temperature :300-330 ℃
Performance of a material, electrical insulation (especially high-frequency insulation) fine, white hard and brittle, falling on the ground with metal sound, light transmittance behind plexiglass, color of water resistance, good chemical stability. Has excellent flame resistance, as non-combustible plastic. 2, the general strength, good rigidity, but the crisp, easy to produce brittle fracture stress, impatience benzene gasoline and other organic solvents. Long-term use temperature of up to 260 degrees, 400 degrees in the air or nitrogen to maintain stability. By adding glass fiber or other reinforcing material modification, can greatly improve the impact strength, heat resistance and other mechanical properties also increased, the density increased to 1.6-1.9, molding shrinkage rate to 0.15-0.25% for smaller production of heat-resistant parts. insulation and chemical equipment. optical instruments and other parts.
Formability 1 amorphous material, moisture absorption is small, but should dry forming. (2) mobility between the ABS and PC, fast solidification, shrinkage is small, easy to break down, use the higher injection pressure and injection speed. Take mold temperature 100-150 degrees. Sprue taper should be large, flow should be short.

15, ETFE plastic
(PTFE - ethylene copolymer)
English name: Polytetrafluoro ethylene
Weight: 1.7 grams / cubic centimeter molding shrinkage :3.1-7.7% molding temperature :300-330 ℃
Performance of a material, long-term use temperature -80--220 degree, have excellent chemical resistance, for all chemicals are corrosion-resistant, lowest coefficient of friction in the plastic, as well as good electrical properties, the electrical insulation is not affected by temperature, the "plastics king," said. 2, and its chemical resistance similar to PTFE, PVDF than good. 3, the creep resistance and good compression strength than PTFE, high tensile strength, elongation up to 100-300%. Dielectric properties and good resistance to radiation performance. 1, suitable for production of corrosion-resistant parts, reducing wear resistant parts, seals, insulation, and medical equipment parts. 2, wire, cable insulation, anti-corrosion equipment, sealing materials, valve bushing, and chemical containers.
Forming properties of 1 crystalline material, moisture absorption small. Thermoplastics can be used too often have to be processed into products processing methods. 2 poor mobility, easily decomposed when corrosive gases. To strictly control the molding temperature should not exceed 350 degrees, the mold should be heated to 100-150 degrees, the gating system flow resistance of the material should be small. 0.7-0.8 mm thick can be formed thin-walled simple products. 3 transparent pellets, injection molding, extrusion molding. Molding temperature of 300-330 degrees, 350 degrees or more prone to discoloration or the occurrence of air bubbles. Should be high-speed low-pressure molding, and pay attention to stripping would be more difficult.

16, PFA plastic
(Soluble PTFE)
English name: Polytetrafluoro ethylene
Gravity :2.13-2 .167 grams / cubic centimeter molding shrinkage :3.1-7.7% molding temperature :350-400 ℃
Performance of a material for a small amount of perfluorinated propyl vinyl ether and perfluorinated copolymer of PTFE. Enhanced melt adhesive, melt viscosity decreased, while no change in performance compared with PTFE. Such resins can be directly processed using ordinary thermoplastic molding method into products. 2, the long-term use temperature -80--260 degree, have excellent chemical resistance, for all chemicals are corrosion-resistant, lowest coefficient of friction in the plastic, as well as good electrical properties, the electrical insulation from temperature effect, the "king of plastic," said. 2, and its chemical resistance similar to PTFE, PVDF than good. 3, the creep resistance and good compression strength than PTFE, high tensile strength, elongation up to 100-300%. Dielectric properties and good resistance to radiation performance. Flame retardancy of V0 grade. 1, suitable for production of corrosion-resistant parts, reducing wear resistant parts, seals, insulation, and medical equipment parts. 2, high temperature wire and cable insulation, anti-corrosion equipment, sealing materials, valve bushing, and chemical containers.
Forming properties of 1 crystalline material, moisture absorption small. Thermoplastics can be used too often have to be processed into products processing methods. 2 poor mobility, easily decomposed when corrosive gases. To strictly control the molding temperature should not exceed 475 degrees, the mold should be heated to 150-200 degrees, the gating system flow resistance of the material should be small. 3 translucent pellets, injection molding, extrusion molding. Molding temperature of 350-400 degrees, 475 degrees or more prone to discoloration or the occurrence of air bubbles. And note that stripping would be more difficult. 4, the molten material due to corrosion of metals, long-term production, chrome plating mold needs.

17, PAR plastic (U plastic)
(Poly-aromatic resin)
English name:
The proportion of 1.2-1.26 g / cc molding shrinkage: 0.8% of the molding temperature :300-350 ℃
Performance of a material for transparent amorphous thermoplastic engineering plastic with excellent heat resistance, flame resistance and non-toxic. Can be directly processed using ordinary thermoplastic molding method into products. 2, excellent thermal performance, 1.86MPA the load, the heat distortion temperature of up to 175 degrees, the decomposition temperature of 443 degrees. The various mechanical properties less affected by temperature. 1, suitable for production of heat, fire and electrical parts with high dimensional stability. Connectors, coil, the relay case. 2, lighting parts. Can be made transparent shade, lighting, automotive reflectors, etc.
Forming properties of 1 with increased wall thickness, mold shrinkage increases. 2. Hygroscopicity small, about 0.1-0.3%, but when the micro-injection of water will cause decomposition of poly-aromatic resin. Therefore, materials must be dried before molding. To moisture content less than 0.02%.

18, Phenolic (PF)
English name: Phenol-Formaldehyde (PF)
Proportion of 1.5 - 2.0 grams / cubic centimeter molding shrinkage rate 1.0% 0.5-forming temperature :150-170 ℃
Bakelite is a material performance of hard and brittle thermosetting plastic, commonly known as bakelite. High mechanical strength, toughness wear-resistant, dimensionally stable, corrosion resistance, electrical insulation performance. Suitable for production of electrical, instrumentation insulated body parts, can be used in hot and humid conditions
Forming properties of 1 shape better, but the general direction of contraction and larger than the amino plastics, and water containing volatile. Should be preheated prior to molding, the molding process should exhaust, not a mild warm-up mode should be increased molding pressure. (2) mold temperature greater impact on liquidity, generally over 160 degrees, liquidity will decline rapidly. 3-hardening rate is generally slower than the amino plastic, hardening heat released large. Large thick-walled plastic parts of the internal temperature is easy too high, uneven and prone to hardening heat.

19, amino plastics (MF, UF)
English name: MF, UF
Weight: 1.5 grams / cubic centimeter molding shrinkage 0.6 - 1.0% molding temperature :160-180 ℃
Materials arc of ability and good electrical insulation, water resistance, good heat resistance, suitable for compression molding for the production of electrical arc-resistant and explosion-proof electrical insulation parts
Forming properties of a Liquidity is good, fast curing, preheating and molding it to the appropriate temperature, paint, mold and pressurized faster. (2) large molding shrinkage. 3 more volatile with water, easy to absorb moisture, caking, molding should be warm and dry and prevent further moisture, but too dry and then decreased mobility. Formed when water and decomposition products are acidic, the mold should be chrome-plated to prevent corrosion, when forming the exhaust. 4 forming temperature greater impact on the quality of plastic parts, the temperature is too high prone to decomposition, discoloration, uneven color bubbles, the temperature is too low, poor mobility, not shiny. 5 material fine, hematocrit large inflatable multi-compound, forming large spindles with a pre-plastic parts, easy to produce ripple and flow pattern, it generally should not be used

20, epoxy resin (EP)
English name: Epoxide Resin
Weight: 1.9 grams / cubic centimeter molding shrinkage: 0.5% of the molding temperature :140-170 ℃
Performance of the mechanical properties of materials, electrical insulation, chemical stability, strong adhesion to many materials, but the performance by the variety and content of filler. Alicyclic epoxy plastics cluster high heat resistance. Suitable for molding and casting for production of electrical low-pressure extrusion molding, potting electronic components and coil and fixed, can be used to repair
Forming properties of 1. Castable. Mobility, and hardening shrinkage is small, but poor thermal rigid and difficult to mold. 2 fast hardening, hardening generally do not need to exhaust, immediately after loading pressure.

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