GPPS Ningbo Liwan GP535N

Material Introduction: GPPS Ningbo Liwan GP535N is a general‑purpose polystyrene plastic. It features high transparency, good flowability, favorable rigidity, decent light transmittance and easy‑processing performance.

Main Applications

Daily‑use articles: tableware, lamp shades, toys.

Electrical components: instrument housings, lighting fixtures, household appliances, etc.

Others: various transparent packaging, stationery and so on.

Physical Properties

Performance Category	Test Item	Test Standard	Unit	Typical Value / Range
Basic Properties	Melt Flow Rate (MFR)	ASTM D1238	g/10min	3.5‑4.5
	Density	ASTM D792	g/cm³	1.04
Mechanical Properties	Tensile Strength	ASTM D638	MPa	45
	Flexural Strength	ASTM D790	MPa	76‑94
	Flexural Modulus	ASTM D790	MPa	3038‑3230
	Elongation at Break	ASTM D638	%	2‑3
	Izod Notched Impact Strength	ASTM D256	J/m or kg·cm/cm	15.7‑18 or 1.7‑1.8
Thermal Properties	Heat‑Distortion Temperature (HDT)	ASTM D648 (1.8 MPa)	°C	89.4‑93
	Vicat Softening Temperature	ASTM D1525	°C	96‑100
Optical Properties	Light Transmittance	ASTM D1003	%	≥ 88 (typical value)
Other Properties	Residual Styrene Monomer	‑	ppm	≤ 700

Injection Molding Parameters

Process Parameter	Reference Range / Recommendation	Remarks & Descriptions
Drying Treatment	75°C for 1‑2 hours	Although PS has low moisture absorption, drying helps reduce product defects.
Barrel Temperature	Rear zone: 185°C, Middle zone: 205°C, Front zone: 215°C
Nozzle Temperature	205°C
Melt Processing Temperature	180‑225°C
Mold Temperature	20‑70°C	Higher mold temperature improves part gloss and reduces internal stress.
Injection Pressure	‑	Subject to part geometry and wall thickness (typical GPPS range: approx. 40‑80 MPa).
Injection Speed	Medium

Disclaimer: All above data is for reference only.