Most of our products are made by injection molding of GPPS (As described below) which has crystal appearance similar to Acrylic but with cheaper price.


General Purpose Polystyrene (GPPS)

General Purpose Polystyrene, the parent of the styrene plastics family, is a high-molecular-weight linear polymer consisting of about 2000-3000 styrene units. General-purpose polystyrene (g.-p, ps) is often called crystal ps-the name denotes only the clarity of the resin and should not be mistaken for crystallinity.


Property

The commercial success of crystal PS is owed to its clear advantages as a material. It is easily formed into finished products that need little maintenance; is light, versatile, and has excellent thermal and electrical properties. Much of its advantage over other thermoplastics stems from its amorphous nature, which results in clarity and fabrication ease. Because there is no crystalline melting point, it needs little energy input and removal for fabrication (no heat of crystallization), and the transition from glass to viscous liquid is gradual. Above the glass transition temperature (Tg), PS is a viscous liquid with high melt strength that can he fabricated easily by extrusion or injection molding with little or no degradation.


Injection molding

The injection molding of thermoplastics is a process by which the plastic material is melted and then injected into a mold cavity. Once the melted plastic is in the mold. it cools to a shape that reflects the cavity.

The resulting form usually is a finished part, needing no other work before assembly into or use as a finished product. Many details, such as bosses, ribs and screw threads can be formed during the one-step injection molding operation.