HIPS Liaotong Chemical 825

Material Introduction: HIPS Liaotong Chemical 825 is a high‑impact polystyrene plastic. It is widely applied in multiple fields thanks to its high gloss, high impact resistance and good processability.

Main Applications

Toys, instrument parts, structural foam materials, TV housings, electrical‑equipment housings.

Physical Properties

Performance Category	Test Item	Reference Test Standard	Unit	Typical Value / Range
Physical Properties	Melt Flow Rate (MFR)	‑	g/10min	6‑9 (2.5‑4.5 for 825TV)
	Density	ASTM D792	g/cm³	~1.04 (typical value for HIPS)
Mechanical Properties	Izod Impact Strength	‑	kg·cm/cm	9.6 (8.0 for 825TV)
	Tensile Strength	‑	kg/cm²	195 (235 for 825TV)
	Tensile Strength	‑	MPa	~19.1 (converted from 195 kg/cm²)
Thermal Properties	Vicat Softening Temperature	‑	°C	92 (97 for 825TV)
Optical Properties	Gloss	‑	‑	60 (65 for 825TV)
Other Properties	Residual Styrene Monomer	‑	ppm	≤700
	Mold Shrinkage	ASTM D955	%	0.3‑0.7 (typical value for HIPS)

Injection Molding Parameters

Process Parameter	Reference Range / Recommendation	Remarks & Descriptions
Drying Treatment	Normally unnecessary; dry at 70‑80°C for 2‑3 hours under improper storage conditions	HIPS has low moisture absorption and generally does not require drying. Drying is recommended in high‑humidity environments or under improper storage conditions.
Barrel Temperature	190‑240°C	Higher injection and molding temperatures are preferred due to rubber‑modified composition.
Mold Temperature	40‑60°C	Higher mold temperature helps reduce internal stress.
Injection Pressure	Medium‑to‑high	Sufficient holding pressure, holding time and cooling time are required.
Injection Speed	Medium speed	Avoid excessive speed which may cause molding defects.
Back Pressure	0.5‑1.0 MPa	Appropriate back pressure facilitates melt homogenization.
Screw Speed	Medium (e.g. 50‑100 rpm)	Avoid excessive screw speed to prevent shear overheating.

Disclaimer: All above data is for reference only.