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What is "GPPS" raw material?

October 27, 2025

GPPS (General Purpose Polystyrene), commonly known as "transparent polystyrene", is one of the most widely used plastics. It has excellent transparency, high stiffness, and excellent formability (injection molding, extrusion, foaming, etc.). It has good chemical stability and is resistant to most inorganic acids and alkalis, but is easily corroded by organic solvents such as alcohol and gasoline. GPPS is used for disposable cups, boxed lunch boxes, household cutlery boxes, candy trays, packaging, CD boxes, seasoning containers, various films, etc.

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Property Test Method Test Condition Unit General Purpose PS
GP5250/N GP535N GP535H GP550N GP560N
Melt Flow Index ASTM D-1238 200 °C X 5kg g/10 min 9.0 3.5 2.6 1.9 1.9
ISO 1133
Izod Impact Strength ASTM D-256 23 °C , 6.4mm Thick,Notched kg-cm/cm 1.7 1.9 2.0 1.9 1.9
ISO 180 23 °C , 4mm Thick,Notched kJ/m2 1.8 1.8 1.9 1.7 1.7
Charpy Impact
Strength		 ISO-179 23 °C,4mm Thick GPPS Unnotched ,
4mm Thick,HIPS Notched		 kJ/m2 8.0 8.5 7.5 8.0 8.0
Tensile Strength ASTM D-638 23 °C , 5mm/min kg/cm2 440 470 520 510 510
ISO 527 23 °C , 20mm/min MPa 45 45 45 50 50
Tensile Modulus ASTM D-638 23 °C , 1mm/min kg/cm2 26500 27000 27000 27000 27000
ISO 527 23 °C , 1mm/min MPa 3300 3350 3350 3400 3400
Tensile Elongation ASTM D-638 23 °C , 5mm/min % 2 2 2 2 2
ISO 527 23 °C , 20mm/min 1.5 1.7 1.7 1.7 1.7
Flexural Strength ASTM D-790 23 °C , 1,2mm/min  Span  50.8mm kg/cm2 900 970 990 1000 1000
ISO 178 23 °C , 2mm/min  Span  64mm MPa 70 70 80 95 95
Flexural Modulus ASTM D-790 23 °C , 1.2mm/min Span  50.8mm kg/cm2 30000 29000 30000 30000 30000
ISO 178 23 °C , 2mm/min  Span  64mm MPa 3000 3100 3100 3300 3300
Heat Deflection
 Temperature		 ASTM D-648 Unannealed, 120°C /h,1.8MPa, 3.2mm Thick °C 75 77 82 82 82
Annealed 80°C *2hr, 120°C /h,
1.8MPa, 3.2mm Thick		 90 92 95 95 95
ISO 75/A Unannealed, 120°C /h,
1.8MPa 4mm Thick		 75 78 82 82 82
Annealed 80°C *2hr, 120°C /h,
1.8MPa 4mm Thick		 90 93 96 96 96
Vicat Softening Point ASTM D-1525 Annealed 80°C *2hr,
10N 50°C /h		 °C 97 99 106 106 106
ISO 306
Residual Monomer — — ppm max 500 500 500 500 500
Flammability UL-94 — — 1.5mm HB All Color 1.5mm HB All Color 1.5mm HB All Color 1.5mm HB All Color 1.5mm HB All Color
Speciality Injection molding High heat resistance High heat resistance High M.W., Extrusion High M.W., Extrusion
Application Food containers, Stationery, Toys, Cassettes, Cosmetic cases Tableware, Lampshades, Crystal plates,Toys, Refrigerator drawer Refrigerator drawer TV & illumination diffusion plate,Light guide plate