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Plastic mold manufacturers explain the identification and characteristics of commonly used plastics for injection
Edit:Taizhou Huangyan Yige Machinery Co., Ltd.   UpDate:2019-03-29

Plastic mold manufacturers believe that injection plastic parts are increasingly used, and identifying plastics and selecting materials is the basis for processing injection parts. Here are the names, common names, strengths, defects, typical modification methods and applications of commonly used plastics for injection.

ABS (styrene-butadiene-propylene)

The original material is ivory in color, and its density is greater than 1, so it will sink to the bottom slowly. The ABS products will immediately turn white when exposed to external forces or twists; when they are tested by the incineration method, they can be incinerated. The flame is yellow, and black smoke is floating in the air with the flame.

Strengths

a. The part is hard and resistant, and has high impact resistance at low temperatures.

b. Low water absorption, it is the best insulation material.

c. The product is shiny, the scale is stable, the mold surface can be copied high, the appearance is not easy to wear, and it has outstanding electrical functions and mobility.

d. High mechanical strength, strong impact, even at low temperature; good notch sensitivity, good creep resistance, low coefficient of friction, and little change due to temperature and humidity.

Defect

a. It is not resistant to organic solvents and will be swelled and dissolved by polar solvents; it has poor weather resistance and will undergo oxidative differentiation.

b. The viscosity of the solution is large.

c. Color quality is relatively sensitive to temperature.

Modification information

a. ABS + PC or SAN, improve heat distortion temperature;

b. ABS + PVC, improve fire protection function.

Use

Housings for electrical appliances, housings for daily necessities, high-end toys, furniture, sports equipment, etc.

GPPS (polystyrene)

The material itself is bright and bright, slowly sinking in water, and the part is fragile. The inner flame is yellow when incinerated, and the outer flame is black. It will drip and have a significant odor when the fire subsides.

Strengths

a. Good optical function, light transmittance is 88% -92%, refractive index is 1.59-1.60.

b. Good electrical function, volume resistance is 1018 ohms.

c. Low specific heat, low melt viscosity, strong plasticization, fast heating molding, short molding cycle, far difference between molding temperature and differentiation temperature, low crystallinity, and good scale stability.

d. Excellent activity and heat stability, short shortening rate and radiation resistance.

e. The plastic itself is bright and clear, with good coloring properties and easy to use.

Defect

a. Brittleness, impact strength is 83.3-98 Pa, poor wear resistance, forming high requirements for packaging, storage and transportation.

b. Low heat-resistant temperature and high water absorption. Dry before molding. The dried materials cannot be exposed to the air for a long time.

b. Product processing requirements are high, the machine must have excellent clamping force, easy to use a dedicated screw, poor data mobility.

c. The material is sensitive to stress and requires high precision for the mold. When designing the product, the wall thickness of the product must be considered.

Use

It is mostly used in the production of electric toy casings, electrical casings, safety helmets, bulletproof glass and electrical components.

PP (one hundred percent glue)

Strengths

a. Excellent mobility and good molding function.

b. The appearance of the product is good, and the dyeing effect and trauma residue are better than polyethylene.

c. General plastics with high heat resistance.

d. High molecular weight, easy to crystallize, high tensile yield strength.

e. Good electrical function, low density and resistance to stress cracking.

Defect

a. The shortening rate is large, and the size of the product is not easy to control.

b. The inner wall of the larger part is easy to show vacuum.

c. High requirements for mold exhaust.

d. Printing, pasting, plating and other processing difficulties.

e. Poor fire resistance and poor weather resistance.

f. Lack of rigidity and low notch strength.

Mechanical target

a. Heat-resistant temperature 135-150 degrees.

b. Organic acid resistant to 80 degrees.

c. PP + 10% talc, heat stabilizer, easy to move, high gloss, used for small electrical appliances, auto parts.

d. PP + 20% -40% talc, heat stabilizer, easy to move, stable in size, used in engineering parts.

e. PP + 40% talc, detergent, easy to move, short cycle, used in washing machine, dry cleaning machine.

f. PP + 30% -40% chemically coupled glass fiber, thermal stabilizer, high rigidity, high strength, low shortening for engineering and automotive parts.

g. PP + flame retardant, anti-ultraviolet, easy to move, weather resistant, mostly used for indoor and outdoor furniture.

Use

Packing plastic bags, drawing, with rope, toys, daily necessities, bottles, plastic blue plastic racks, washing machines.

PMMA (plexiglass, acrylic)

Plexiglass is difficult to catch fire, but it can be slowly incinerated and spontaneously ignites after leaving the fire. The flame is blue, the top is white, and the plastic melts and foams. It announces a strong smell of flowers and fruits and rotten vegetables.

Strengths

a. Non-crystalline plastic, good transparency in plastic guessing, can pass 270nm ultraviolet wave, similar to optical glass.

b. Non-oxidizing acid, inorganic salt solution, excellent weather resistance.

c. Good electrical function and relatively stable scale.

Defect

a. Brittleness, although the appearance strength is high, but it is scarred after being rubbed by hard objects.

b. Notched impact strength is low, processing is not easy, and water absorption is large.

c. It is sensitive to heat, and the data will be discolored if it is dried for a long time, and it is light yellow.

Use

Clear gelatin plates, decorations, sunglasses, stationery, lampshades, camera lenses, artificial jewelry, etc.

PA (nylon)

Strengths

a. High mechanical strength, good resistance, high tensile and compressive strength, tensile strength close to the yield strength, and strong absorption of impact stress and vibration.

b. The fatigue resistance is outstanding, and the original mechanical strength can be maintained after repeated inflections.

c. Appearance lubrication, small friction coefficient, wear resistance and lubricity.

d. Corrosion resistant, very resistant to alkalis and most acids.

e. Non-toxic, lazy to biological erosion, excellent antibacterial and anti-mold ability.

f. The heat-resistant temperature range is -40-100 degrees, and it can withstand 120-150 degrees for a short time.

Defect

a. It is easy to absorb water, the scale is not stable, it is not resistant to strong acid and oxidant, and it cannot be used as acid resistant material.

b. Poor anti-rotation function. Under the high temperature for a long time, the thermal oxidation effect with the oxygen in the air starts to brown and then crack.

c. The injection molding process has strict requirements. Moisture has a great disadvantage to the molding, and the thermal expansion scale is difficult to control. The inconsistent dimensions of the wall thickness will cause distortion and deformation of the part, and the post-processing equipment is highly demanding.

Use

Produced wire drawing, toothbrush bristles, fishing wire, packaging film, gears, power tool housings, electrical accessories, power tools, etc.

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