PS plastic introduction

- Jun 30, 2019-

PS plastic introduction

   PS (polystyrene plastic) refers to a class of plastics including styrene groups in macromolecular chains, including styrene and its copolymers. Specific varieties include ordinary polystyrene (GPPS) and high impact polystyrene (HIPS). ), expandable polystyrene (EPS) and metallocene polystyrene (SPS).

Material characters:

   General purpose polystyrene is a thermoplastic resin that is a glossy, transparent beaded or granulated solid. The density is 1.04 to 1.09, the transparency is 88% to 92%, and the refractive index is 1.59 to 1.60. Under the action of stress, birefringence is produced, the so-called stress-optical effect. The melting temperature of the product is 150 to 180 ° C, the thermal decomposition temperature is 300 ° C, the heat distortion temperature is 70 to 100 ° C, and the long-term use temperature is 60 to 80 ° C. At a lower heat distortion temperature of 5 to 6 ° C, after annealing, the stress can be eliminated and the heat distortion temperature is increased. If a small amount of α-methylstyrene is added during the production process, the heat resistance grade of the general-purpose polystyrene can be improved.

  It is soluble in aromatic hydrocarbons, chlorinated hydrocarbons, aliphatic ketones and esters, but only swells in acetone. It is resistant to certain mineral oils, organic acids, bases, salts, lower alcohols and their aqueous solutions. Low water absorption, maintaining its mechanical properties and dimensional stability in a humid environment. Optical performance is second only to acrylic resins. Excellent electrical properties, high volume resistivity and surface resistivity, independent of temperature and humidity changes, and not affected by corona discharge. Radiation resistance is also very good. Its main disadvantages are brittle and fragile, low impact strength, poor heat resistance, inability to withstand boiling water, and can only be used at lower temperatures and lower loads. Low sunlight resistance and flammable. Black smoke when burning, and has a special odor.

Molding processing:

  Polystyrene has good fluidity, good processing performance, easy coloring and good dimensional stability. It can be processed into various parts by injection molding, extrusion molding, blow molding, foaming, thermoforming, bonding, coating, welding, machining, printing, etc., and is especially suitable for injection molding.

   The material can generally be used directly without injection during injection molding. However, in order to improve the quality of the product, it can be pre-dried in a blast oven at 55 to 70 ° C for 1 to 2 hours. The specific processing conditions are as follows: the cylinder temperature is about 200 ° C, the mold temperature is 60 to 80 ° C, the injection temperature is 170 to 220 ° C, 60 to 150 MPa, and the compression ratio is 1.6 to 4.0. In order to eliminate the internal stress, the molded product can be treated at 70 ° C for 2 to 4 hours in an infrared lamp or a forced air oven.

Parameter performance:

PS plastic (polystyrene)

English name: Polystyrene

Specific gravity: 1.05 g / cm 3

Molding shrinkage: 0.6-0.8%

Molding temperature: 170-250 ° C

Drying conditions: no drying required

 Asia Billion are a small/middle size professional injection tooling & injection molding manufacture as well as metal machined components in South China .Our stability quality, Lower price and good service has given our customer a big confidence to new production development and market competition . ISO 9001 certified and TS 16949 compliance, each project  with very competitive price and quality assurance. we made a lot of PS plastic injection molding production, if you want to find a good supplier for your project , please contact us freely at:

Asia Billion Innovational Technology Ltd  

Mobile for business:  +86-134 8063 8827

 This link is one of one PS plastoc molding project for our Germany and south Aferica customer in our production list.

Previous:PS material properties and applications Next:PPO/PPE material introduction