Characteristics and uses of HIPS plastic materials. Advantages and disadvantages of HIPS materials

The scientific name of HIPS is high-impact polystyrene. Its true color is a sub-white opaque material with a matte surface, flexible and not brittle; non-toxic and odorless.

Combustion characteristics
It is flammable and can continue to burn after being removed from the fire. The upper end of the flame is golden yellow. It will soften and bubble when burning. No liquid will drip. It will emit thick black columns of smoke and fly ash.

advantage
Because polystyrene is hard and brittle, easily broken, and not impact-resistant, rubber modification is used to solve the above problems. The biggest advantage of HIPS is its high impact strength, which is more than 4 times higher than ABS. Excellent electrical insulation, HIPS is easy to color and print. The surface hardness of HIPS is relatively high

shortcoming
Although HIPS has high impact strength, its elongation rate is smaller than that of ABS. Therefore, the screw holes designed on the casing are more likely to be broken by self-tapping screws. Due to the addition of rubber components, the surface gloss also becomes dim and the surface is matte; HIPS has poor thermal stability and low heat resistance.

Purpose
1. Used in the production of housings for household appliances
2. Used in the production of daily necessities and toy shells
3. Used for extrusion blow molding containers, hollow products, bottles

Injection molding performance
The melting point of general HIPS is about 170°C, and the decomposition temperature is 260°C; the adjustable range of injection molding temperature is relatively large. When injection molding, the general operating temperature is 180℃--240℃; due to the presence of rubber components, it absorbs a small amount of moisture. During production, it needs to be coaxed dry. It can be dried at 80-90℃ for 1-2 hours; HIPS due to the rubber component The existence of HIPS has poor thermal stability, so do not stop in the barrel during injection molding. The melt viscosity of HIPS is larger than that of PS, but the gate and runner are average and can be filled with products; products are prone to static electricity and the surface is prone to attract dust. Shrinkage rate is 5‰; overflow value is 0.05mm