🔬 Key Specifications for GPPS Low impact MFI
Typical Grades & MFI
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GPPS‑1540 — MFI: ≈ 2.5 g/10 min (ASTM D1238) — medium flow low-impact grade GPPS‑1460 — MFI: ≈ 6.5 g/10 min (ISO 1133) — moderate flow, clarity focused
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GP110 film-grade — MFI: ~1.7 g/10 min, tailored for extrusion
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Tensile Strength: ~42–48 MPa
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Tensile Modulus: ~2 800–3 200 MPa
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Elongation at Break: ~1–3 %
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Notched Izod Impact Strength: ~1.5 kJ/m² (some listings up to 8 kJ/m² unnotched)
Thermal & Other Physical Properties
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Vicat Softening Point: 92–103 °C depending on grade
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Rockwell Hardness: scale ~L70
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Residual Styrene: generally < 500 ppm
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Density: ~1.04 g/cm³
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Water Absorption: < 0.1 %
| Specification | GPPS‑1540 (2.5 MFI) | GPPS‑1460 (6.5 MFI) | GPPS‑525 (6–9 MFI) |
|---|---|---|---|
| MFI (200 °C, 5 kg) | ≈ 2.5 g/10 min | ≈ 6.5 g/10 min | 6–9 g/10 min |
| Tensile Strength | ~48 MPa | ~48 MPa | ≥ 42 MPa |
| Tensile Modulus | ~3 200 MPa | ~3 200 MPa | ~3 200 MPa |
| Elongation at Break | ~3 % | ~1 % | — |
| Notched Izod Impact | ~1.5 kJ/m² | — | ≥ 7 kJ/m² |
| Vicat Softening Point | ≥ 101 °C | 103 °C | ≥ 92 °C |
| Rockwell Hardness | L70 | L70 | — |
| Residual Styrene | < 500 ppm | < 500 ppm | ≤ 700 ppm |
| Density | ~1.04 g/cm³ | ~1.04 g/cm³ | ~1.04 g/cm³ |
| Water Absorption | < 0.1 % | < 0.1 % | — |
📌 Applications & Considerations of GPPS Low impact MFI
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GPPS‑1540: Ideal for transparent injection-moulded items like cups, office products, and food trays when low MFI and higher heat resistance are needed.
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GPPS‑1460/525/535: Balanced flow for foam board insulation, packaging, and general-purpose applications; moderate clarity with decent mechanical strength.
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GP110 (film extrusion): For extrusion sheet, vacuum forming, food wrapping – tight control of flow and heat resistance proplussourcing.com.
🛠 Low‑Impact GPPS: When to Choose It
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Low MFI (1–3 g/10 min): Suited for thicker parts, slower flow, needing better thermal stability.
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Mid MFI (5–11 g/10 min): Great for faster injection cycles, thin-walled parts, or foam extrusion.
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Clarity ranges from high transparency (> 88 %) to opaque crystallinity depending on resin purity/grade.
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