GPPS Saibaolong Jiangsu GP‑525

Material Introduction: GPPS Saibaolong Jiangsu GP‑525 is a general‑purpose polystyrene plastic. It is widely adopted for its high transparency, good rigidity and easy‑processing performance, suitable for molding processes such as injection molding.

Main Applications

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

Packaging: cosmetic containers and other packaging fields.

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

Others: indoor and outdoor decorations, fruit plates, etc.

Physical Properties

Performance Category	Test Item	Test Standard	Unit	Typical Value / Range
Basic Properties	Melt Flow Rate (MFR)	ASTM D1238	g/10min	5‑10 (or 7.0)
	Density	ASTM D792	g/cm³	1.04
Mechanical Properties	Tensile Strength (TSB)	ASTM D638	MPa	≥40
	Izod Notched Impact Strength	ASTM D256	J/m	≥19 (or 22)
Thermal Properties	Vicat Softening Temperature	ASTM D1525	°C	≥92 (or ≥93)
Optical Properties	Yellow Index	ASTM E313	‑	0‑0.5
Other Properties	Cleanliness (Impurity Particles)	GB 12671	pcs/100g	≤2 (or ≤20)
	Residual Styrene Monomer	SBL‑QA / GB/T 16867	ppm / %	≤500 / ≤0.034%

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.