GPPS CITIC Guoan (Formerly Leighton Chemical) GPS‑525

Material Introduction: GPPS CITIC Guoan (Formerly Leighton Chemical) GPS‑525 is a general‑purpose polystyrene plastic. It is widely applied thanks to its high transparency, good rigidity, favorable flowability and easy‑processing performance.

Main Applications

Audio‑visual products, medical supplies, laboratory utensils, household articles, toys, lighting fixtures, cosmetic containers, indoor and outdoor decorations, etc.

Physical Properties

Performance Category	Test Item	Test Standard	Unit	Typical Value / Range
Physical Properties	Density	‑	g/cm³	1.04
	Melt Flow Rate (MFR)	‑	g/10min	7.0
Mechanical Properties	Tensile Strength	‑	MPa	46
	Flexural Strength	‑	MPa	82
	Elongation at Break	‑	%	3
	Izod Impact Strength	‑	J/m	20
	Rockwell Hardness	‑	Scale M	70
Thermal Properties	Vicat Softening Point	‑	°C	94
	Heat‑Distortion Temperature (HDT)	‑	°C	78
Optical Properties	Haze	‑	%	0.8
Other Properties	Residual Styrene Monomer Content	‑	mg/kg	≤500

Injection Molding Parameters

Process Parameter	Reference Range / Recommendation	Remarks & Descriptions
Drying Treatment	80°C for 2‑3 hours	PS has low moisture absorption (less than 0.2 %); drying is generally unnecessary. Drying is recommended under improper storage conditions.
Barrel Temperature	180‑280°C (preferably 185‑215°C)	Upper limit for flame‑retardant grade is 250°C; decomposition temperature is approx. 290°C.
Mold Temperature	40‑50°C	Higher mold temperature improves part gloss.
Injection Pressure	200‑600 bar	Subject to part geometry and wall thickness.
Injection Speed	High injection speed recommended	High injection speed is preferred especially for complex‑shaped and thin‑wall parts.
Runners and Gates	All conventional gate types are applicable	‑

Disclaimer: All above data is for reference only.