GPPS Anqing Xingda GPPS‑525

Material Introduction: GPPS Anqing Xingda GPPS‑525 is a general‑purpose polystyrene plastic. Its core advantages are high transparency, excellent rigidity, dimensional stability and cost‑effectiveness. It is suitable for applications with high requirements on optical performance.

Main Applications

Food containers: fruit plates, salad boxes, disposable cups (food‑contact certification required).

Cosmetic packaging: lipstick tubes, essence bottle bodies (benefiting from high light transmittance and gloss).

Pharmaceutical packaging: pill storage boxes, cotton‑swab tubes (not for direct sterile contact).

Light‑guide plate substrate: small‑size LED light boxes, backlit signboards (light transmittance＞90%).

Display props: luxury‑goods display racks, museum relic protective covers (anti‑static treatment for dust prevention).

Household articles: clothes hangers, storage boxes, pen holders (good adhesion for surface screen printing).

Electrical components: transparent windows for hair dryers, instrument covers (insulation resistance＞10¹⁶ Ω·cm).

Physical Properties

Performance Category	Test Item	Test Standard	Unit	Typical Value	Remarks
Basic Properties	Melt Flow Rate (MFR)	ASTM D‑1238	g/10min	6.0‑10.0	200°C/5kg
	Density	ASTM D‑792	g/cm³	1.04‑1.05
Mechanical Properties	Tensile Yield Strength	ASTM D‑638	MPa	36‑41
	Flexural Strength	ASTM D‑790	MPa	68‑85
	Flexural Modulus	ASTM D‑790	MPa	3100‑3300
	Izod Notched Impact Strength	ASTM D‑256	J/m	15.7‑23
	Elongation	ASTM D‑638	%	2‑3
Thermal Properties	Vicat Softening Temperature	ASTM D‑1525	°C	90‑95
	Heat‑Distortion Temperature (HDT)	ASTM D‑648	°C	86‑90	1.8 MPa, unannealed
Optical Properties	Light Transmittance	ASTM D‑1003	%	≥ 87
	Haze	ASTM D‑1003	%	≤ 0.2
Other Properties	Residual Styrene Monomer	‑	ppm	≤ 800

Injection Molding Parameters

Process Stage	Parameter Item	Typical Value / Range	Unit	Remarks
Drying	Drying Temperature	55‑70	°C	1‑2 hours normally, subject to storage conditions
Barrel Temperature	Rear zone	160‑180	°C
	Middle zone	180‑200	°C
	Front zone	200‑220	°C
	Nozzle	200‑220	°C
Mold Temperature		60‑80	°C	Improves gloss and reduces internal stress
Injection Pressure		40‑80	MPa	Depends on product shape and dimension
Holding Pressure		30%‑60% of injection pressure	MPa	Reduces sink marks and warpage
Screw Speed		50‑100	rpm	Avoid high speed to prevent material degradation
Back Pressure		0.5‑1.5	MPa	Proper back pressure ensures uniform plasticization

Extrusion Process Parameters

Parameter Item	Typical Value / Range	Unit
Screw L/D Ratio	25:1 ~ 30:1	‑
Screw Compression Ratio	2.0:1 ~ 2.5:1	‑
Barrel Temperature (Feed Section)	160‑180	°C
Barrel Temperature (Compression Section)	180‑200	°C
Barrel Temperature (Metering Section)	200‑220	°C
Die Temperature	200‑215	°C
Melt Temperature	210‑230	°C
Mold Temperature	60‑80	°C

Disclaimer: All above data is for reference only.