ChiMei Polyrex® PH-88 HIPS
Plastic Granules
POLYREX® PH-88 Polystyrene High Impact Extrusion Grade
POLYREX PH-88 is a high-impact HIPS resin engineered for durability and heat resistance. Ideal for demanding applications like electronics housings, toys, and daily essentials, it combines superior impact strength (11 KJ/m² at 23°C) with a Vicat softening temperature of 96°C, ensuring reliability under stress and heat.
Associated Documents
ISO TDS
ASTM TDS
MSDS
UL Product iQ
Processing Data
Typical property data
Physical Properties
- Melt Flow Index: 5.5 ml/10 min (ISO 1133, 200°C × 5 kg)
- Mass Density: 1.03 g/cm³ (ISO 1183, 23°C)
Mechanical Properties
- Tensile Strength:
- Yield: 26 MPa (ISO 527, 50 mm/min)
- Break: 24 MPa (ISO 527, 50 mm/min)
- Tensile Elongation: 50% (ISO 527, 50 mm/min)
- Flexural Strength: 37 MPa (ISO 178, 2 mm/min)
- Flexural Modulus: 2.1 GPa (ISO 178, 2 mm/min)
- Izod Impact Strength:
- 23°C, Notched: 11 KJ/m² (ISO 180/1A)
- -30°C, Notched: 6 KJ/m² (ISO 180/1A)
- Charpy Impact Strength:
- 23°C, Notched: 11 KJ/m² (ISO 179)
- -30°C, Notched: 6.5 KJ/m² (ISO 179)
Thermal Properties
- Vicat Softening Temperature:
- 50°C/hr, 1 kg: 96°C (ISO 306)
- 50°C/hr, 5 kg: 90°C (ISO 306)
- Heat Distortion Temperature:
- 1.8 MPa, Unannealed: 74°C (ISO 75/A)
- 1.8 MPa, Annealed: 89°C (ISO 75/A)
- Coefficient of Linear Thermal Expansion: 4~6 × 10⁻⁵ (ISO 11359)
Flammability
UL-94: HB (1.5 mm thickness)
Mold Shrinkage
0.4~0.7% (ISO 294-4)
Process Guide
- Pre-Drying: 80°C for 2–3 hours (depends on humidity, reground resin ratio, and storage conditions)
- Barrel Setting Profile:
- Max: 200°C / 200°C / 180°C
- Min: 180°C / 180°C / 160°C
- Mold Temperature: 40~70°C (depends on part thickness, dimensions, and gate/runner system)
Features & Benefits
Superior Impact Resistance
With Izod impact strength of 11 KJ/m² (23°C), CHIMEI PH-88 HIPS resists cracks and breaks, perfect for toys and rugged electronics housings that require long-term durability.
Heat-Resistant Performance
A Vicat softening point of 96°C (1KG) ensures stability in high-temperature environments, making it ideal for appliances or automotive components exposed to heat.
Easy Processing & Consistency
A melt flow index of 5.5 ml/10 min enables smooth injection molding, reducing cycle times and waste for cost-efficient production of complex parts like thin-walled containers.
Use & Applications
- Toys: Withstands drops and impacts (e.g., action figures, outdoor play equipment).
- Electronics: Durable shells for TVs, printers, and small appliances needing heat resistance.
- Daily Essentials: Lightweight yet sturdy containers, kitchenware, and cosmetic packaging.
