ChiMei POLYREX PG-33 GPPS is a high-transparency, medium-fluidity injection molding grade polystyrene. Featuring exceptional optical clarity, balanced rigidity, and excellent processability, it is ideal for transparent consumer goods, appliance components, and packaging.
| Manufacturer | Chimei |
|---|---|
| Density | 1.04 g/cm³ |
| MFR | 8.0 cm³/10 min |
| Flexural Modulus | 3100 MPa |
| Tensile Strength at Break | 48 MPa |
Note: See the product description for additional technical specifications
ChiMei POLYREX® PG-33 is a high-performance general-purpose polystyrene (GPPS) injection molding grade resin produced by ChiMei Corporation. The material appears as water-clear to colorless transparent cylindrical pellets, featuring excellent optical clarity and amorphous polymer characteristics. As a premier benchmark grade within ChiMei’s polystyrene product portfolio, PG-33 holds a solid industry position in the global high-transparency plastics market, widely meeting the demand for cost-effective transparent materials in global industrial manufacturing. This product is primarily applied in transparent daily commodities, home appliance panels, electronic product casings, and packaging containers.
| Item | Test Value | Test Unit | Test Standard |
| Density (23 °C) | 1.04 | g/cm³ | ISO 1183 |
| Melt Volume-Flow Rate (MFR) (200 °C, 5 kg) | 8 | cm³/10 min | ISO 1133 |
| Item | Test Value | Test Unit | Test Standard |
| Tensile Strength at Break (50 mm/min) | 48 | MPa | ISO 527-2/50 |
| Tensile Strain at Break (50 mm/min) | 2 | % | ISO 527-2/50 |
| Flexural Modulus (2 mm/min) | 3100 | MPa | ISO 178 |
| Flexural Strength (2 mm/min) | 75 | MPa | ISO 178 |
| Charpy Notched Impact Strength (23 °C) | 2.7 | kJ/m² | ISO 179 |
| Izod Notched Impact Strength (23 °C) | 4 | kJ/m² | ISO 180/1A |
| Item | Test Value | Test Unit | Test Standard |
| Deflection Temperature Under Load, Unannealed (1.8 MPa) | 76 | °C | ISO 75-2/A |
| Deflection Temperature Under Load (1.8 MPa) | 87 | °C | ISO 75-2/A |
| Vicat Softening Temperature (50 °C/h, 10 N) | 90 | °C | ISO 306/B50 |
| Coefficient of Linear Thermal Expansion (CTE), Parallel | 5.0E-5-8.0E-5 | cm/cm/°C | ISO 11359-2 |
| Flammability Rating (1.5 mm) | HB | — | UL 94 |
Disclaimer: The technical data sheet (TDS) of ChiMei POLYREX® PG-33 GPPS material from ChiMei corporation, if there are differences, please refer to the official website of ChiMei.
Outstanding Optical Clarity: As an amorphous polymer, its molecular structure grants exceptional light transmittance, presenting a crystal-clear appearance that perfectly matches high-end transparent product visual requirements.
Excellent Dimensional Stability: Featuring extremely low and uniform molding shrinkage, products maintain high dimensional accuracy after injection molding and are resistant to warpage.
Good Melt Flowability: Equipped with a balanced melt volume-flow rate (8.0 cm³/10 min), it exhibits superior melt fluidity during injection molding, easily filling thin-walled and complex mold cavities.
Balanced Rigidity and Mechanical Strength: Boasting a flexural modulus of 3100 MPa and a flexural strength of 75 MPa, it provides reliable rigid support among amorphous plastics.
Reliable Flammability Rating: Complies with the UL 94 HB flammability standard, meeting safety regulations for general consumer electronics and home appliance insulation components.
Home Appliances & Consumer Electronics: Widely used for manufacturing transparent observation windows, indicator light covers, internal refrigerator storage bins, water dispenser components, and router housings for various home appliances.
Packaging & Consumer Goods: Suitable for premium transparent packaging boxes, cosmetic display stands, disposable high-end tableware, candy boxes, and transparent toy parts.
Stationery & Office Supplies: Frequently utilized to produce high-transparency rulers, set squares, pen holders, file folders, and various transparent stationery shells.
Lighting & Optical Substrates: Applied in producing basic indoor lighting covers, advertising light box panels, and non-precision optical diffusion substrates.
Q1: Does ChiMei PG-33 require drying pretreatment prior to injection molding?
A1: GPPS materials inherently feature extremely low moisture absorption. Under intact original packaging and stored in a dry, well-ventilated environment (relative humidity < 70%), it can typically be fed directly into the injection molding machine. However, if the final product has stringent surface appearance requirements (such as preventing silver streaks or bubbles), or if the material has been exposed to high-humidity environments for extended periods, hot-air circulating drying at 70 to 80 °C for 1 to 2 hours is recommended.
Q2: What are the core advantages of PG-33 compared to PMMA (Acrylic) or PC (Polycarbonate)?
A2: Compared to PMMA and PC, the primary advantages of PG-33 lie in its exceptional cost-effectiveness and processing convenience. Its raw material cost is lower than that of PC and PMMA, and it does not require strict, deep high-temperature drying like PC. Although its impact resistance and heat resistance are slightly inferior to PC, PG-33 achieves outstanding rigidity and transparency at a lower cost in conventional transparent application scenarios that do not demand extreme impact resistance or ultra-high heat resistance.
Q3: Does ChiMei PG-33 comply with relevant environmental and regulatory certifications?
A3: Yes. The product complies with major global environmental and safety standards, including the European Union RoHS directive and REACH regulations regarding substances of high concern (SVHC). Additionally, its flammability performance reaches the UL 94 HB standard. For compliance certification documents specific to food contact or medical-grade applications (such as FDA statements), it is recommended to request the latest compliance certificates directly from ChiMei or authorized suppliers.
Submit your inquiry today and receive a professional competitive price tailored to your project requirements.
