Technical datasheet

GP 125E

Supplied byKumho Petrochemical- Last Updated on Jul 24, 2025

GP 125E by Kumho Petrochemical is a general purpose polystyrene (GPPS) grade. Offers good heat resistance, good flow, high strength, good transparency, good colorability, good electrical properties, good water resistance, and good dimensional stability without toxicity. Is suitable for processing by injection molding. Suitable for foaming process (thermoforming and foaming) with low-melt viscosity and decomposition by heating. GP 125E is recommended for extruded polystyrene applications. It complies with the RoHS, REACH Regulation (EC) No 1907/2006, and UL 94 HB flame rating.
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GP 125E properties

Flammability properties

PropertiesValue & unitTest conditionTest method
Auto-ignition Temperature0.0 Visible After LoginVisible After LoginVisible After Login
Flame Rating0.0 Visible After LoginVisible After LoginVisible After Login
Flash Point0.0 Visible After LoginVisible After LoginVisible After Login

Mechanical properties

PropertiesValue & unitTest conditionTest method
Flexural Modulus0.0 Visible After LoginVisible After LoginVisible After Login
Flexural Strength0.0 Visible After LoginVisible After LoginVisible After Login
Hardness, Rockwell M0.0 Visible After LoginVisible After LoginVisible After Login
Impact Strength, Izod0.0 Visible After LoginVisible After LoginVisible After Login
Tensile Elongation0.0 Visible After LoginVisible After LoginVisible After Login
Tensile Strength0.0 Visible After LoginVisible After LoginVisible After Login

Physical properties

PropertiesValue & unitTest conditionTest method
Density0.0 Visible After LoginVisible After LoginVisible After Login
Linear Mold Shrinkage0.0 Visible After LoginVisible After LoginVisible After Login
Melt Mass-Flow Rate (MFR or MFI = Melt Flow Index or MI = Melt Index)0.0 Visible After LoginVisible After LoginVisible After Login
Water Absorption0.0 Visible After LoginVisible After LoginVisible After Login

Thermal properties

PropertiesValue & unitTest conditionTest method
Deflection Temperature at 1.8 MPa (264 psi)0.0 Visible After LoginVisible After LoginVisible After Login
Vicat Softening Temperature0.0 Visible After LoginVisible After LoginVisible After Login

GP 125E Processing Guidelines

Injection Molding Processing Guidelines

PropertiesValue & unitTest conditionTest method
Drying TemperatureVisible After LoginVisible After Login
Drying TimeVisible After LoginVisible After Login
Front TemperatureVisible After LoginVisible After Login
Hopper Throat TemperatureVisible After LoginVisible After Login
Middle TemperatureVisible After LoginVisible After Login
Mold TemperatureVisible After LoginVisible After Login
Nozzle TemperatureVisible After LoginVisible After Login
Rear TemperatureVisible After LoginVisible After Login

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