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	Metric	English	Comments

Specific Gravity	1.05 g/cc	1.05 g/cc	ASTM D792
Density	1.05 g/cc	0.0379 lb/in³	ASTM D792
Water Absorption	0.00 %	0.00 %	24 hours; ASTM D570
	>= 0.100 % @Time 86400 sec	>= 0.100 % @Time 24.0 hour	ASTM D570
Linear Mold Shrinkage	0.00500 cm/cm @Thickness 3.17 mm	0.00500 in/in @Thickness 0.125 in	ASTM D955
Melt Flow	4.0 - 12 g/10 min	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	3.00 - 8.00 g/10 min @Load 11.0 lb, Temperature 392 °F	ASTM D1238

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell R	92.0	92.0	ASTM D785
Tensile Strength	24.8 MPa	3600 psi	ASTM D638
Tensile Strength, Yield	24.8 MPa	3600 psi	ASTM D638
Elongation at Break	20 %	20 %	ASTM D638
	20.0 %	20.0 %	ASTM D638
Elongation at Yield	5.00 %	5.00 %	ASTM D638
Tensile Modulus	1.79 GPa	260 ksi	ASTM D638
Flexural Strength	49.6 MPa	7200 psi	ASTM D790
Flexural Modulus	2.14 GPa	310 ksi	tangent; ASTM D790
Flexural Modulus, 1% Secant	1930 MPa	280000 psi	ASTM D790
Izod Impact, Notched	0.961 J/cm	1.80 ft-lb/in	ASTM D256
	1.07 J/cm	2.00 ft-lb/in	ASTM D256
Gardner Impact	6.78 J @Thickness 12.7 mm	5.00 ft-lb @Thickness 0.500 in	tup; ASTM D5420

Thermal Properties	Metric	English	Comments
Deflection Temperature at 0.46 MPa (66 psi)	90.6 °C	195 °F	ASTM D648
Deflection Temperature at 1.8 MPa (264 psi)	76.7 °C	170 °F	ASTM D648
Vicat Softening Point	96.1 °C	205 °F	ASTM D648

Processing Properties	Metric	English	Comments
Rear Barrel Temperature	204 - 216 °C	400 - 420 °F
Middle Barrel Temperature	210 - 221 °C	410 - 430 °F
Front Barrel Temperature	221 - 232 °C	430 - 450 °F
Nozzle Temperature	221 - 232 °C	430 - 450 °F
Melt Temperature	218 - 246 °C	425 - 475 °F
Mold Temperature	37.8 - 65.6 °C	100 - 150 °F
Drying Temperature	160 °C @Time 7200 sec	320 °F @Time 2.00 hour

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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