GPPS Lv'an Qingfeng GP‑525

Material Introduction: GPPS Lv'an Qingfeng GP‑525 is a general‑purpose polystyrene plastic. It is widely used for its high transparency, good flowability, favorable rigidity and easy‑processing performance.

Main Applications

Daily‑use articles & toys: stationery, toys and daily‑life products.

Packaging: packaging and related fields.

Others: general‑purpose injection‑molded products.

Physical Properties

Performance Category	Test Item	Test Standard	Unit	Typical Value / Range
Physical Properties	Melt Flow Rate (MFR)	ASTM D1238 (200°C/5kg)	g/10min	7.0
	Density	ASTM D792	g/cm³	1.04
Mechanical Properties	Izod Impact Strength	ISO 180 (23℃)	J/m	22
	Charpy Notched Impact Strength	ISO 179 (23℃)	kJ/m²	8
	Tensile Yield Strength	ISO 527 (23℃)	MPa	40
	Tensile Elongation at Break	ISO 527 (23℃)	%	2
Thermal Properties	Vicat Softening Point	ISO 306 (B50/oil)	°C	94
Optical Properties	Haze	ASTM D1003	%	0.5
Other Properties	Residual Styrene Monomer	GB/T 16867‑1997	ppm	< 500

Injection Molding Parameters

Process Parameter	Reference Range / Recommendation	Remarks & Descriptions
Drying Treatment	55‑70°C for 1‑2 hours	Drying of pellets is recommended to reduce product defects, although PS has low moisture absorption (less than 0.2 %).
Barrel Temperature	180‑280°C (commonly 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 and reduces internal stress.
Injection Pressure	200‑600 bar (approx. 20‑60 MPa)	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.
Screw Speed	‑	Avoid excessive screw speed to prevent shear overheating or material degradation.
Runners and Gates	All conventional gate types are applicable	‑

Disclaimer: All above data is for reference only.