Polystyrene (PS) is a synthetic polymer made from monomers of the aromatic hydrocarbon styrene. It can be solid or foamed.It is a light weight material popular for its high impact strength and toughness. Polystyrene (PS) injection molding is a manufacturing process for producing parts by injecting molten Polystyrene (PS) into a mold. Echofast offers custom plastic mold service with expert consultation on each injection mold quote, and we can meet your unique needs while providing a fast and easy manufacturing experience.
As a thermoplastic polymer, PVC comes in rigid (sometimes abbreviated as RPVC) and flexible forms. Its properties are usually categorized based on these forms.
| Property | Unit of measurement | Rigid PVC | Flexible PVC |
|---|---|---|---|
| Density | g/cm3 | 1.3–1.45 | 1.1–1.35 |
| Thermal conductivity | W/(m·K) | 0.14–0.28 | 0.14–0.17 |
| Yield strength | psi | 4,500–8,700 | 1,450–3,600 |
| MPa | 31–60 | 10.0–24.8 | |
| Young's modulus | psi | 490,000 | —— |
| Gpa | 3.4 | —— | |
| Flexural strength (yield) | psi | 10,500 | —— |
| MPa | 72 | —— | |
| Compression strength | psi | 9,500 | —— |
| MPa | 66 | —— | |
|
Coefficient of thermal expansion (linear) |
mm/(mm °C) | 5×10-5 | —— |
| Vicat B | °C | 65–100 | Not recommended |
| Resistivity | Ω m | 1016 | 1012-1015 |
| Surface resistivity | Ω | 1013-1014 | 1011-1012 |
Typically, PVC boasts the versatile nature and excellent properties include high impact strength, high density, hardness and durability, outstanding tensile strength, and resistance to environmental and chemical degradation.
| Drying |
Not usually necessary as PVC absorbs very little water. |
| Melt Temperature | 160 - 220 C (320 - 428 F) |
| Mold Temperature | 20 - 70 C (68 - 158 F) |
| Material Injection Pressure | Up to 150 MPa |
| Packing Pressure | Up to 100 MPa |
| Injection Speed | Relatively slow, to avoid material degradation |
PVC injection molding is a popular process used in a variety of industries. Some common products that use the injection molding process include:
