Names of commonly used plastics for injection (ABS, PS, PP)

ABS (styrene-butadiene-propylene)

The raw material is ivory color, and its density is greater than 1, so it will slowly sink to the bottom when placed in water. ABS products will turn white immediately when they are subjected to external force or bending; they can burn when tested by the combustion method, the flame is yellow, and there are traces of black smoke floating in the air with the flame.

  advantage

a. The workpiece is hard and tough, and has a high impact resistance at low temperature.

b. Low water absorption, it is an excellent insulating material.

c. The parts are shiny, dimensionally stable, with high die surface replication capability, the surface is not easy to wear, and has good electrical properties and fluidity.

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

  shortcoming

a. Not resistant to organic solvents, will be swollen and dissolved by polar solvents; poor weather resistance, will be oxidized and decomposed.

b. The viscosity of the solution is high.

c. Color quality is relatively sensitive to temperature.

Modified material

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

b. ABS+PVC, improve fire performance.

Purpose

Shells of electrical appliances, shells of daily necessities, advanced toys, furniture, sports equipment, etc.

GPPS (polystyrene)

The material itself is smooth and transparent, sinks slowly in water, and the parts are fragile. When burning, the inner flame is yellow, and the outer flame is black, which will drip, and there is a distinct smell after the fire is extinguished.

  advantage

a. Good optical performance, the transmittance is 88%-92%, and the refractive index is 1.59-1.60.

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

c. Low specific heat, low melt viscosity, strong plasticizing ability, fast heating molding, short molding cycle, far difference between molding temperature and decomposition temperature, low crystallinity, and good dimensional stability.

d. Good fluidity and thermal stability, small shrinkage, and radiation resistance.

e. The plastic itself is smooth and transparent, with good colorability and easy to use.

  shortcoming

a. Brittle, the impact strength is 83.3-98 Pa, and the poor wear resistance results in high requirements for packaging, storage and transportation.

b. The heat-resistant temperature is low, the maximum temperature is 60-80 degrees, the rigid material, the thermal expansion coefficient is large, and the heat load is poor.

c. The molding process has high requirements, the aging phenomenon of the parts is obvious, and the thermal sensitivity is large.

d. Poor acid resistance.

e. Fragile, flammable, high static and easy to dust.

Purpose

It can be used as a cleaning agent for molding machines without side effects; it can also be used to make toys, stationery, daily necessities and containers.

HIPS (modified polystyrene, not broken glue)

HIPS is a modified product of GPPS added with rubber material. Its purpose is to improve the impact strength of the material. The material is colorless and transparent, and can be colored according to needs.

                                                                                                              Information comes from China Plastic Hanger Network