Overview of materials for Polystyrene, Molded, Unreinforced

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Overview of materials for Polystyrene, Molded, Unreinforced
Categories:	Polymer; Thermoplastic; Polystyrene (PS); Polystyrene, Molded, Unreinforced
Material Notes:	This property data is a summary of similar materials in the MatWeb database for the category "Polystyrene". Each property range of values reported is minimum and maximum values of appropriate MatWeb entries. The comments report the average value, and number of data points used to calculate the average. The values are not necessarily typical of any specific grade, especially less common values and those that can be most affected by additives or processing methods.
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Physical Properties	Metric	English	Comments

Density	0.0130 - 1.18 g/cc	0.000470 - 0.0426 lb/in³	Average value: 0.984 g/cc Grade Count:142
Water Absorption	0.000 - 0.100 %	0.000 - 0.100 %	Average value: 0.0900 % Grade Count:35
Moisture Absorption at Equilibrium	0.100 %	0.100 %	Average value: 0.100 % Grade Count:20
Water Absorption at Saturation	0.100 %	0.100 %	Average value: 0.100 % Grade Count:5
Particle Size	2000 - 4000 µm	2000 - 4000 µm	Average value: 3000 µm Grade Count:4
Linear Mold Shrinkage	0.00200 - 0.00800 cm/cm	0.00200 - 0.00800 in/in	Average value: 0.00511 cm/cm Grade Count:65
Melt Flow	1.20 - 100 g/10 min	1.20 - 100 g/10 min	Average value: 9.26 g/10 min Grade Count:161

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell L	48.0 - 82.0	48.0 - 82.0	Average value: 67.6 Grade Count:16
Hardness, Rockwell M	35.0 - 80.0	35.0 - 80.0	Average value: 72.8 Grade Count:20
Hardness, Rockwell R	71.0 - 120	71.0 - 120	Average value: 109 Grade Count:11
Ball Indentation Hardness	60.0 - 155 MPa	8700 - 22500 psi	Average value: 134 MPa Grade Count:15
Tensile Strength, Ultimate	5.50 - 59.0 MPa	798 - 8560 psi	Average value: 41.0 MPa Grade Count:106
Tensile Strength, Yield	4.22 - 59.0 MPa	612 - 8560 psi	Average value: 32.3 MPa Grade Count:73
Elongation at Break	0.400 - 70.0 %	0.400 - 70.0 %	Average value: 13.7 % Grade Count:121
Elongation at Yield	1.40 - 40.0 %	1.40 - 40.0 %	Average value: 14.0 % Grade Count:5
Modulus of Elasticity	0.894 - 3.55 GPa	130 - 515 ksi	Average value: 2.78 GPa Grade Count:80
Flexural Yield Strength	28.0 - 106 MPa	4060 - 15400 psi	Average value: 70.9 MPa Grade Count:79
Flexural Modulus	0.894 - 3.60 GPa	130 - 522 ksi	Average value: 2.68 GPa Grade Count:95
Poissons Ratio	0.220	0.220	Average value: 0.220 Grade Count:3
Shear Modulus	0.750 - 1.45 GPa	109 - 210 ksi	Average value: 1.23 GPa Grade Count:7
Izod Impact, Notched	0.107 - 2.14 J/cm	0.200 - 4.00 ft-lb/in	Average value: 0.455 J/cm Grade Count:81
	0.350 - 0.800 J/cm @Temperature -40.0 - 0.000 °C	0.656 - 1.50 ft-lb/in @Temperature -40.0 - 32.0 °F	Average value: 0.531 J/cm Grade Count:6
Izod Impact, Notched (ISO)	1.50 - 11.0 kJ/m²	0.714 - 5.23 ft-lb/in²	Average value: 4.58 kJ/m² Grade Count:25
	2.00 - 3.00 kJ/m² @Temperature -30.0 - -30.0 °C	0.952 - 1.43 ft-lb/in² @Temperature -22.0 - -22.0 °F	Average value: 2.57 kJ/m² Grade Count:3
	1.50 - 8.00 kJ/m² @Temperature -30.0 - -30.0 °C	0.714 - 3.81 ft-lb/in² @Temperature -22.0 - -22.0 °F	Average value: 2.57 kJ/m² Grade Count:6
	1.50 - 8.00 kJ/m² @Thickness 4.00 - 4.00 mm	0.714 - 3.81 ft-lb/in² @Thickness 0.157 - 0.157 in	Average value: 2.57 kJ/m² Grade Count:6
Izod Impact, Unnotched (ISO)	5.00 - 25.0 kJ/m²	2.38 - 11.9 ft-lb/in²	Average value: 8.69 kJ/m² Grade Count:12
Charpy Impact Unnotched	0.700 - 1000 J/cm²	3.33 - 4760 ft-lb/in²	Average value: 2.28 J/cm² Grade Count:38
	1.00 - 16.0 J/cm² @Temperature -40.0 - -30.0 °C	4.76 - 76.1 ft-lb/in² @Temperature -40.0 - -22.0 °F	Average value: 7.75 J/cm² Grade Count:4
Charpy Impact, Notched	0.200 - 1.60 J/cm²	0.952 - 7.61 ft-lb/in²	Average value: 0.476 J/cm² Grade Count:31
	0.150 - 0.360 J/cm² @Temperature -40.0 - -30.0 °C	0.714 - 1.71 ft-lb/in² @Temperature -40.0 - -22.0 °F	Average value: 0.255 J/cm² Grade Count:2
Tensile Creep Modulus, 1 hour	3100 - 3300 MPa	450000 - 479000 psi	Average value: 3240 MPa Grade Count:7
Tensile Creep Modulus, 1000 hours	2200 - 2600 MPa	319000 - 377000 psi	Average value: 2470 MPa Grade Count:9

Electrical Properties	Metric	English	Comments
Electrical Resistivity	1e+05 - 1.00e+18 ohm-cm	1e+05 - 1.00e+18 ohm-cm	Average value: 9.06e+16 ohm-cm Grade Count:37
Surface Resistance	10000 - 1.00e+16 ohm	10000 - 1.00e+16 ohm	Average value: 5.70e+14 ohm Grade Count:42
Static Decay	0.0100 - 2.00 sec	0.0100 - 2.00 sec	Average value: 0.543 sec Grade Count:5
Dielectric Constant	2.00 - 2.70	2.00 - 2.70	Average value: 2.48 Grade Count:32
Dielectric Strength	19.7 - 160 kV/mm	500 - 4060 kV/in	Average value: 77.2 kV/mm Grade Count:30
Dissipation Factor	0.0000500 - 0.00200	0.0000500 - 0.00200	Average value: 0.000208 Grade Count:19
Arc Resistance	120 - 180 sec	120 - 180 sec	Average value: 150 sec Grade Count:3
Comparative Tracking Index	250 - 600 V	250 - 600 V	Average value: 418 V Grade Count:25
Hot Wire Ignition, HWI	15.0 - 30.0 sec	15.0 - 30.0 sec	Average value: 22.5 sec Grade Count:4
High Amp Arc Ignition, HAI	120 arcs	120 arcs	Average value: 120 arcs Grade Count:4
High Voltage Arc-Tracking Rate, HVTR	10.0 - 25.4 mm/min	0.394 - 1.00 in/min	Average value: 15.8 mm/min Grade Count:4

Thermal Properties	Metric	English	Comments
CTE, linear	40.0 - 90.0 µm/m-°C	22.2 - 50.0 µin/in-°F	Average value: 75.2 µm/m-°C Grade Count:27
Thermal Conductivity	0.170 W/m-K	1.18 BTU-in/hr-ft²-°F	Average value: 0.170 W/m-K Grade Count:12
Deflection Temperature at 0.46 MPa (66 psi)	70.0 - 108 °C	158 - 226 °F	Average value: 87.7 °C Grade Count:31
Deflection Temperature at 1.8 MPa (264 psi)	62.0 - 98.0 °C	144 - 208 °F	Average value: 81.3 °C Grade Count:112
Vicat Softening Point	70.0 - 108 °C	158 - 226 °F	Average value: 95.0 °C Grade Count:143
Glass Transition Temp, Tg	83.0 - 100 °C	181 - 212 °F	Average value: 90.5 °C Grade Count:6
Flammability, UL94	HB - V-0	HB - V-0	Grade Count:91
Flame Spread	26.0 - 35.0 mm/min	1.02 - 1.38 in/min	Average value: 27.9 mm/min Grade Count:8
Oxygen Index	18.0 - 25.0 %	18.0 - 25.0 %	Average value: 19.6 % Grade Count:8
Glow Wire Test	650 - 850 °C	1200 - 1560 °F	Average value: 670 °C Grade Count:14

Optical Properties	Metric	English	Comments
Refractive Index	1.59 - 1.59	1.59 - 1.59	Average value: 1.59 Grade Count:7
Haze	0.350 - 88.0 %	0.350 - 88.0 %	Average value: 13.1 % Grade Count:7
Transmission, Visible	1.00 - 92.0 %	1.00 - 92.0 %	Average value: 86.1 % Grade Count:27

Processing Properties	Metric	English	Comments
Processing Temperature	190 - 300 °C	374 - 572 °F	Average value: 223 °C Grade Count:6
Melt Temperature	40.0 - 280 °C	104 - 536 °F	Average value: 217 °C Grade Count:56
Mold Temperature	10.0 - 82.0 °C	50.0 - 180 °F	Average value: 41.8 °C Grade Count:49
Injection Velocity	200 mm/sec	7.87 in/sec	Average value: 200 mm/sec Grade Count:3
Drying Temperature	60.0 - 85.0 °C	140 - 185 °F	Average value: 72.0 °C Grade Count:23
Moisture Content	0.0300 - 0.250 %	0.0300 - 0.250 %	Average value: 0.148 % Grade Count:10

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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O4800 / 77775

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