GPPS SECCO GPPS‑123

Material Introduction: GPPS SECCO GPPS‑123 is a general‑purpose polystyrene plastic. It is widely used for its high transparency, high flowability, favorable mechanical strength, and compliance with food‑contact and medical‑grade standards.

Main Applications

Medical tubes, drinking straws, food packaging, paper substitutes, vending cups, pens, transparent water tanks for humidifiers.

Physical Properties

Performance Category	Test Item	Test Standard	Unit	Typical Value / Range
Physical Properties	Melt Flow Rate (MFR)	ISO 1133 (200°C/5kg)	g/10min	10
	Density	ISO 1183	kg/m³	1040
Mechanical Properties	Tensile Yield Strength	ISO 527‑2	MPa	50
	Flexural Strength	ISO 178	MPa	80
	Flexural Modulus	ISO 178	MPa	3200
	Charpy Notched Impact Strength	ISO 179	kJ/m²	10
	Elongation at Break	ISO 527‑2	%	2
Thermal Properties	Heat‑Distortion Temperature (HDT)	ISO 75‑2 (1.82 MPa)	°C	78
	Vicat Softening Temperature	ISO 306 (B50)	°C	88
Optical Properties	Appearance	‑	‑	Highly transparent

Injection Molding Parameters

Process Parameter	Reference Range / Recommendation	Remarks & Descriptions
Drying Treatment	Normally unnecessary; if improperly stored, dry at 55‑70°C for 1‑2 hours	Polystyrene has low moisture absorption, while drying can further reduce the risk of product defects.
Barrel Temperature	180‑240°C	Upper limit for flame‑retardant grade is 250°C; decomposition temperature is approximately 290°C.
Mold Temperature	30‑60°C	Higher mold temperature improves part gloss and reduces internal stress.
Injection Pressure	40‑80 MPa (general GPPS range)	Subject to part geometry and wall thickness.
Injection Speed	High injection speed recommended (general suggestion for GPPS)	High injection speed is preferred especially for complex‑shaped and thin‑wall parts.
Screw Speed	50‑100 rpm (general GPPS range)	Avoid excessive screw speed to prevent shear overheating or material degradation.

Disclaimer: All above data is for reference only.