GPPS Dushanzi Petrochemical GPPS‑500NT

Material Introduction: GPPS Dushanzi Petrochemical GPPS‑500NT is a high‑transparency general‑purpose polystyrene resin. It features good rigidity, easy‑processing performance and favorable thermal properties.

Main Applications

Medical packaging: laboratory test articles, cosmetic packaging, etc.

Electrical components: insulating materials, electrical packaging, radio components, monitor housings, etc.

Transparent daily‑use products: CD cases, lighting equipment (e.g. lamp housings), displays, etc.

Physical Properties

Performance Category	Test Item	Test Standard	Unit	Typical Value / Range
Basic Properties	Melt Flow Rate (MFR)	ISO 1133 (200°C/5kg)	g/10min	5.0
	Density	ISO 1183	g/cm³	1.04
Mechanical Properties	Tensile Strength	ISO 527‑2	MPa	≥44 (for reference)
	Charpy Notched Impact Strength	ISO 179‑1	kJ/m²	≤3 (typically 1.2)
Thermal Properties	Vicat Softening Temperature	ISO 306 (B50/oil)	°C	99
	Heat‑Distortion Temperature (HDT)	ISO 75‑2 (1.8 MPa)	°C	89
Other Properties	Residual Styrene Monomer	General Standard / GB/T 16867	ppm	<150 or <600
	Yellow Index	ASTM E‑308‑1	‑	‑8 ~ 0
	Pellet Appearance (Colored Pellets)	SH/T 1541	pcs/kg	≤40

Injection Molding Parameters

Process Parameter	Reference Range / Recommendation	Remarks
Drying Treatment	55‑70°C for 1‑2 hours	Pellet drying is recommended to reduce product defects.
Barrel Temperature	160‑220°C	Rear zone: 160‑180°C, Middle zone: 180‑200°C, Front zone: 200‑220°C
Mold Temperature	60‑80°C	Higher mold temperature improves product gloss and reduces internal stress.
Injection Pressure	40‑80 MPa	Subject to part geometry and wall thickness.
Holding Pressure	30%‑60% of injection pressure	Lower holding pressure helps reduce internal stress and warpage.
Screw Speed	50‑100 rpm	Avoid excessive screw speed to prevent shear overheating or material degradation.

Disclaimer: All above data is for reference only.