Plastics Group Polifil® RP-HIPS High Impact Polystyrene

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Plastics Group Polifil® RP-HIPS High Impact Polystyrene
Categories:	Polymer; Thermoplastic; Polystyrene (PS); Polystyrene, Impact Modified
Material Notes:	Polifil® RP-High Impact Polystyrene (HIPS) combines the good stiffness properties of polystyrene, with enhanced impact properties gained by the addition of impact modifiers, usually butadiene rubber. An amorphous resin, HIPS has low post-molding shrinkage, good melt strength, and a wide melt processing window, making the resin ideal for many sheet and thermoforming applications. Injection molding applications include cutlery, appliance parts, and furniture components. Sheet extrusion applications include thermoformed plates, cups, and trays. Information provided by The Plastics Group.
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Physical Properties	Original Value	Comments

Specific Gravity	1.05 g/cc	ASTM D792
Density	1.05 g/cc	ASTM D792
Water Absorption	0.00 %	24 hours; ASTM D570
	>= 0.100 % @Time 86400 sec	ASTM D570
Linear Mold Shrinkage	0.00500 in/in @Thickness 3.17 mm	ASTM D955
Melt Flow	4.0 - 12 g/10 min	200/5; May be specified; ASTM D1238
	3.00 - 8.00 g/10 min @Load 5.00 kg, Temperature 200 °C	ASTM D1238

Mechanical Properties	Original Value	Comments
Hardness, Rockwell R	92.0	ASTM D785
Tensile Strength	3600 psi	ASTM D638
Tensile Strength, Yield	3600 psi	ASTM D638
Elongation at Break	20 %	ASTM D638
	20.0 %	ASTM D638
Elongation at Yield	5.00 %	ASTM D638
Tensile Modulus	260 ksi	ASTM D638
Flexural Strength	7200 psi	ASTM D790
Flexural Modulus	310 ksi	tangent; ASTM D790
Flexural Modulus, 1% Secant	280000 psi	ASTM D790
Izod Impact, Notched	1.80 ft-lb/in	ASTM D256
	2.00 ft-lb/in	ASTM D256
Gardner Impact	60.0 in-lb @Thickness 12.7 mm	tup; ASTM D5420

Thermal Properties	Original Value	Comments
Deflection Temperature at 0.46 MPa (66 psi)	195 °F	ASTM D648
Deflection Temperature at 1.8 MPa (264 psi)	170 °F	ASTM D648
Vicat Softening Point	205 °F	ASTM D648

Processing Properties	Original Value	Comments
Rear Barrel Temperature	400 - 420 °F
Middle Barrel Temperature	410 - 430 °F
Front Barrel Temperature	430 - 450 °F
Nozzle Temperature	430 - 450 °F
Melt Temperature	425 - 475 °F
Mold Temperature	100 - 150 °F
Drying Temperature	160 °C @Time 7200 sec

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