770GL30 is a 30% glass fiber-reinforced polyetheretherketone (PEEK) grade developed by Jilin Joinature Polymer Co., Ltd. (China). It belongs to the PEEK-GL series, a family of GF-reinforced PEEK materials available in 5%-35% glass fiber fractions, designed to enhance the mechanical and thermal properties of pure PEEK resin. As an injection-moldable grade, 770GL30 balances strength, rigidity, and processability, making it a preferred choice for demanding industrial applications. Key Material Properties of 770GL30 GF PEEK Mechanical Performance The addition of 30% glass fibers significantly improves the rigidity and creep resistance of PEEK.
 PEEK®—770GL30 | ||||
| Test Item | Test Standard | Test Conditions | Unit | Test Data |
| Mechanical Properties | ||||
| Tensile Strength | ISO 527 | Fracture, 23°C | MPa | 175 |
| Elongation at Break | ISO 527 | Fracture, 23°C | % | 2.7 |
| Flexural Strength | ISO 178 | Fracture, 23°C | MPa | 265 |
| Flexural Modulus | ISO 178 | 23°C | GPa | 11.3 |
| Compressive Strength | ISO 604 | 23°C | MPa | 250 |
| Simple Beam Impact Strength | ISO 179/1eA | Notched | kJ m-2 | 8 |
| ISO 179/1U | Unnotched | kJ m-2 | 55 | |
| Cantilever Beam Impact Strength | ISO 180/A | Notched | kJ m-2 | 10 |
| ISO 180/U | Unnotched | kJ m-2 | 60 | |
| Forming Shrinkage Rate | ISO 294-4 | Parallel to flow direction | % | 0.3 |
| Perpendicular to flow direction | % | 0.8 | ||
| Thermal Performance | ||||
| Melting point | ISO 11357 | - | ℃ | 343 |
| Glass transition temperature | ISO 11357 | Initial | ℃ | 143 |
| Specific heat capacity | DSC | 23°C | kJ kg-1 ℃-1 | 1.7 |
| Thermal expansion coefficient | ISO 11359 | Below Tg along flow direction | ppm K-1 | 18 |
| Above Tg along flow direction | ppm K-1 | 18 | ||
| Heat deflection temperature | ISO 75-f | 1.8 Mpa | ℃ | 328 |
| Thermal conductivity | ISO 22007-4 | 23℃ | W m-1 K-1 | 0.3 |
| Liquidity | ||||
| Melt Index | ISO 1133 | 380℃, 5kg | g 10min-1 | 4.5 |
| Others | ||||
| Density | ISO 1183 | Crystalline | g cm-3 | 1.51 |
| Non-crystalline | g cm-3 | - | ||
| Shore D Hardness | ISO 868 | 23°C | 88 | |
| Water Absorption Rate (3.2mm thick stretched rod) (Immersion Test) | ISO 62-1 | 24 hours, 23°C | % | 0.04 |
| Equilibrium, 23°C | % | 0.3 | ||
| Electrical Properties | ||||
| Dielectric Strength | IEC 60243-1 | 2mm | kV mm-1 | 25 |
| Compared to Tracking Index | IEC 60112 | - | V | 150 |
| Dielectric Constant | IEC 60250 | 23℃, 1kHz | - | 3.2 |
| 23℃, 50Hz | - | - | ||
| Tangent of Loss | IEC 60250 | 23℃, 1MHz | - | 0.005 |
| Volume Resistivity | IEC 60093 | 23℃, 1V | Ω cm | 1016 |
| 275℃ | Ω cm | - | ||
Tensile Strength: 165 MPa (23°C, ISO 527)
Flexural Modulus: 11,000 MPa (23°C, ISO 178)
Compressive Strength: 250 MPa (23°C, ISO 604)
Impact Resistance: Balanced performance with a notched Izod impact strength of 9 kJ/m² (ISO 180/A) and unnotched Charpy impact strength of 55 kJ/m² (ISO 179/1U).
These values indicate that 770GL30 retains sufficient toughness while achieving superior stiffness compared to unreinforced PEEK. Thermal Stability 770GL30 inherits PEEK’s inherent high-temperature resistance, with enhanced performance due to glass fiber reinforcement:
Glass Transition Temperature (Tg): 143°C (ISO 11357)
Melting Point (Tm): 343°C (ISO 11357)
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