Overview of materials for Polystyrene

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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

Bulk Density	0.0100 - 0.700 g/cc	0.000361 - 0.0253 lb/in³	Average value: 0.535 g/cc Grade Count:161
Density	0.00800 - 2.14 g/cc	0.000289 - 0.0773 lb/in³	Average value: 0.930 g/cc Grade Count:1652
Solids Content	35.0 - 69.0 %	35.0 - 69.0 %	Average value: 49.8 % Grade Count:32
Filler Content	5.00 - 40.0 %	5.00 - 40.0 %	Average value: 23.7 % Grade Count:57
Volatiles	0.400 - 0.750 %	0.400 - 0.750 %	Average value: 0.585 % Grade Count:24
Apparent Bulk Density	0.00900 - 0.650 g/cc	0.000325 - 0.0235 lb/in³	Average value: 0.0585 g/cc Grade Count:26
Water Absorption	0.000 - 9.00 %	0.000 - 9.00 %	Average value: 0.175 % Grade Count:475
Moisture Absorption at Equilibrium	0.000 - 1.19 %	0.000 - 1.19 %	Average value: 0.0905 % Grade Count:226
Water Absorption at Saturation	0.000 - 4.40 %	0.000 - 4.40 %	Average value: 0.294 % Grade Count:192
Particle Size	0.110 - 4000 µm	0.110 - 4000 µm	Average value: 1230 µm Grade Count:73
Bead Size	0.200 - 3.20 mm	0.00787 - 0.126 in	Average value: 0.994 mm Grade Count:78
pH	4.00 - 11.0	4.00 - 11.0	Average value: 8.60 Grade Count:32
Viscosity	1.70 - 190000 cP	1.70 - 190000 cP	Average value: 5540 cP Grade Count:62
	1600 - 2300 cP @Temperature 180 - 180 °C	1600 - 2300 cP @Temperature 356 - 356 °F	Average value: 30400 cP Grade Count:5
	66000 - 66000 cP @Temperature 280 - 280 °C	66000 - 66000 cP @Temperature 536 - 536 °F	Average value: 30400 cP Grade Count:2
	66000 - 66000 cP @Shear Rate 1500 - 1500 1/s	66000 - 66000 cP @Shear Rate 1500 - 1500 1/s	Average value: 30400 cP Grade Count:2
Mooney Viscosity	25.0 - 155	25.0 - 155	Average value: 62.1 Grade Count:63
Viscosity Measure	6.00 - 4000 cSt	6.00 - 4000 cSt	Average value: 126 cSt Grade Count:40
Maximum Moisture Content	0.200	0.200	Average value: 0.200 Grade Count:13
Thickness	25.4 - 1520 microns	1.00 - 60.0 mil	Average value: 460 microns Grade Count:20
Linear Mold Shrinkage	0.000100 - 0.0250 cm/cm	0.000100 - 0.0250 in/in	Average value: 0.00504 cm/cm Grade Count:1049
Linear Mold Shrinkage, 6.35 mm section	0.00100 - 0.00700 cm/cm	0.00100 - 0.00700 in/in	Average value: 0.00392 cm/cm Grade Count:13
Linear Mold Shrinkage, Transverse	0.000900 - 0.0200 cm/cm	0.000900 - 0.0200 in/in	Average value: 0.00563 cm/cm Grade Count:145
Melt Flow	0.200 - 97.0 g/10 min	0.200 - 97.0 g/10 min	Average value: 10.4 g/10 min Grade Count:1045
Ash	0.200 - 70.0 %	0.200 - 70.0 %	Average value: 6.91 % Grade Count:18
Collected Volatile Condensable Material	0.700 - 1.00 %	0.700 - 1.00 %	Average value: 0.817 % Grade Count:6

Chemical Properties	Metric	English	Comments
Styrene Content	0.0500 - 55.0 %	0.0500 - 55.0 %	Average value: 11.6 % Grade Count:92
Butadiene Content	60.0 - 78.0 %	60.0 - 78.0 %	Average value: 69.3 % Grade Count:12
Blowing Agent Content	4.00 - 6.80 %	4.00 - 6.80 %	Average value: 5.71 % Grade Count:78

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell L	40.0 - 108	40.0 - 108	Average value: 69.4 Grade Count:75
Hardness, Rockwell M	11.0 - 150	11.0 - 150	Average value: 72.6 Grade Count:148
Hardness, Rockwell R	53.0 - 124	53.0 - 124	Average value: 103 Grade Count:165
Hardness, Shore A	45.0 - 99.0	45.0 - 99.0	Average value: 69.5 Grade Count:104
Hardness, Shore D	36.0 - 83.0	36.0 - 83.0	Average value: 70.6 Grade Count:17
Ball Indentation Hardness	60.0 - 165 MPa	8700 - 23900 psi	Average value: 126 MPa Grade Count:32
Tensile Strength, Ultimate	0.331 - 320 MPa	48.0 - 46400 psi	Average value: 51.2 MPa Grade Count:1001
	18.0 - 25.0 MPa @Temperature 60.0 - 60.0 °C	2610 - 3630 psi @Temperature 140 - 140 °F	Average value: 21.0 MPa Grade Count:3
Tensile Strength, Yield	10.3 - 539 MPa	1500 - 78200 psi	Average value: 52.3 MPa Grade Count:986
Elongation at Break	0.500 - 1000 %	0.500 - 1000 %	Average value: 53.2 % Grade Count:1380
Elongation at Yield	0.600 - 75.0 %	0.600 - 75.0 %	Average value: 6.74 % Grade Count:365
Modulus of Elasticity	0.00120 - 35.2 GPa	0.174 - 5100 ksi	Average value: 3.43 GPa Grade Count:938
Flexural Modulus	0.0207 - 24.1 GPa	3.00 - 3500 ksi	Average value: 3.76 GPa Grade Count:1136
	1.90 - 3.30 GPa @Temperature 60.0 - 60.0 °C	276 - 479 ksi @Temperature 140 - 140 °F	Average value: 2.83 GPa Grade Count:3
Flexural Yield Strength	0.0750 - 260 MPa	10.9 - 37700 psi	Average value: 85.7 MPa Grade Count:1043
Compressive Yield Strength	0.0549 - 121 MPa	7.97 - 17500 psi	Average value: 11.1 MPa Grade Count:19
Rebound	24.0 - 55.0 %	24.0 - 55.0 %	Average value: 49.4 % Grade Count:23
Flex Crack Resistance	3000 - 185000	3000 - 185000	Average value: 45400 Grade Count:28
Poissons Ratio	0.300 - 0.390	0.300 - 0.390	Average value: 0.342 Grade Count:19
Izod Impact, Unnotched	0.500 J/cm - NB	0.937 ft-lb/in - NB	Average value: 4.67 J/cm Grade Count:238
	2.67 - 32.04 J/cm @Temperature -40.0 - -30.0 °C	5.00 - 60.02 ft-lb/in @Temperature -40.0 - -22.0 °F	Average value: 9.61 J/cm Grade Count:13
	2.50 - 6.50 J/cm @Temperature -20.0 - -20.0 °C	4.68 - 12.2 ft-lb/in @Temperature -4.00 - -4.00 °F	Average value: 9.61 J/cm Grade Count:4
	2.50 - 6.50 J/cm @Thickness 4.00 - 4.00 mm	4.68 - 12.2 ft-lb/in @Thickness 0.157 - 0.157 in	Average value: 9.61 J/cm Grade Count:4
Izod Impact, Unnotched (ISO)	3.00 kJ/m² - NB	1.43 ft-lb/in² - NB	Average value: 29.5 kJ/m² Grade Count:150
	13.0 - 54.0 kJ/m² @Temperature -30.0 - -30.0 °C	6.19 - 25.7 ft-lb/in² @Temperature -22.0 - -22.0 °F	Average value: 28.7 kJ/m² Grade Count:50
	13.0 - 54.0 kJ/m² @Thickness 3.00 - 3.00 mm	6.19 - 25.7 ft-lb/in² @Thickness 0.118 - 0.118 in	Average value: 28.7 kJ/m² Grade Count:50
Izod Impact, Notched, Low Temp (ISO)	2.50 - 20.0 kJ/m²	1.19 - 9.52 ft-lb/in²	Average value: 7.07 kJ/m² Grade Count:17
Charpy Impact Unnotched	0.600 J/cm² - NB	2.86 ft-lb/in² - NB	Average value: 4.13 J/cm² Grade Count:196
	1.40 J/cm² - NB @Temperature -40.0 - -20.0 °C	6.66 ft-lb/in² - NB @Temperature -40.0 - -4.00 °F	Average value: 4.52 J/cm² Grade Count:39
	1.50 - 10.7 J/cm² @Temperature -30.0 - -30.0 °C	7.14 - 50.9 ft-lb/in² @Temperature -22.0 - -22.0 °F	Average value: 4.52 J/cm² Grade Count:43
	1.50 - 10.7 J/cm² @Thickness 3.00 - 4.00 mm	7.14 - 50.9 ft-lb/in² @Thickness 0.118 - 0.157 in	Average value: 4.52 J/cm² Grade Count:43
Charpy Impact, Notched	0.100 - 4.50 J/cm²	0.476 - 21.4 ft-lb/in²	Average value: 1.03 J/cm² Grade Count:279
	0.350 - 1.90 J/cm² @Temperature -30.0 - -30.0 °C	1.67 - 9.04 ft-lb/in² @Temperature -22.0 - -22.0 °F	Average value: 0.708 J/cm² Grade Count:12
	0.100 - 2.00 J/cm² @Temperature -40.0 - -30.0 °C	0.476 - 9.52 ft-lb/in² @Temperature -40.0 - -22.0 °F	Average value: 0.708 J/cm² Grade Count:65
	0.100 - 2.00 J/cm² @Thickness 3.00 - 4.00 mm	0.476 - 9.52 ft-lb/in² @Thickness 0.118 - 0.157 in	Average value: 0.708 J/cm² Grade Count:65
Gardner Impact	0.0678 - 47.5 J	0.0500 - 35.0 ft-lb	Average value: 18.6 J Grade Count:52
	4.00 - 33.0 J @Temperature -40.0 - -30.0 °C	2.95 - 24.3 ft-lb @Temperature -40.0 - -22.0 °F	Average value: 17.4 J Grade Count:9
Falling Dart Impact	0.447 - 624 J	0.330 - 460 ft-lb	Average value: 67.1 J Grade Count:42
Coefficient of Friction	0.130 - 0.620	0.130 - 0.620	Average value: 0.379 Grade Count:15
Coefficient of Friction, Static	0.150 - 0.890	0.150 - 0.890	Average value: 0.444 Grade Count:24
Penetration	50.0 - 55.0	50.0 - 55.0	Average value: 51.0 Grade Count:5
Tensile Creep Modulus, 1 hour	1600 - 3300 MPa	232000 - 479000 psi	Average value: 2490 MPa Grade Count:38
Tensile Creep Modulus, 1000 hours	1200 - 2600 MPa	174000 - 377000 psi	Average value: 1870 MPa Grade Count:20
Tear Strength	1.05 - 69.6 kN/m	6.00 - 397 pli	Average value: 36.5 kN/m Grade Count:37
K Factor (Wear Factor)	54.0 - 59.0	54.0 - 59.0	Average value: 56.8 Grade Count:13
K (wear) Factor	22.2 - 10900 x 10^-8 mm³/N-M	11.0 - 5420 x 10^-10 in³-min/ft-lb-hr	Average value: 879 x 10^-8 mm³/N-M Grade Count:14
Taber Abrasion, mg/1000 Cycles	8.00 - 152	8.00 - 152	Average value: 66.1 Grade Count:80
Abrasion	0.00300 - 220	0.00300 - 220	Average value: 84.7 Grade Count:45
Compression Set	13.0 - 53.0 % @Temperature 70.0 - 100 °C	13.0 - 53.0 % @Temperature 158 - 212 °F	Average value: 47.1 % Grade Count:22
Izod Impact, Notched @ -40°C	0.300 - 0.400 J/cm	0.562 - 0.749 ft-lb/in	Average value: 0.370 J/cm Grade Count:5
Izod Impact, Notched	0.100 - 10.7 J/cm	0.187 - 20.0 ft-lb/in	Average value: 1.06 J/cm Grade Count:1087
	0.170 - 2.50 J/cm @Temperature -40.0 - -20.0 °C	0.318 - 4.68 ft-lb/in @Temperature -40.0 - -4.00 °F	Average value: 1.03 J/cm Grade Count:165
	0.300 - 0.900 J/cm @Temperature -20.0 - -20.0 °C	0.562 - 1.69 ft-lb/in @Temperature -4.00 - -4.00 °F	Average value: 1.03 J/cm Grade Count:4
	0.300 - 0.900 J/cm @Thickness 4.00 - 4.00 mm	0.562 - 1.69 ft-lb/in @Thickness 0.157 - 0.157 in	Average value: 1.03 J/cm Grade Count:4
Izod Impact, Notched, Low Temp	0.240 - 2.67 J/cm	0.450 - 5.00 ft-lb/in	Average value: 0.800 J/cm Grade Count:30
Izod Impact, Notched (ISO)	1.00 - 50.0 kJ/m²	0.476 - 23.8 ft-lb/in²	Average value: 10.6 kJ/m² Grade Count:290
	1.00 - 33.0 kJ/m² @Temperature -40.0 - -20.0 °C	0.476 - 15.7 ft-lb/in² @Temperature -40.0 - -4.00 °F	Average value: 7.67 kJ/m² Grade Count:157
	1.00 - 33.0 kJ/m² @Thickness 3.00 - 4.00 mm	0.476 - 15.7 ft-lb/in² @Thickness 0.118 - 0.157 in	Average value: 7.67 kJ/m² Grade Count:157

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.100 - 1.80e+20 ohm-cm	0.100 - 1.80e+20 ohm-cm	Average value: 5.00e+17 ohm-cm Grade Count:368
Surface Resistance	10.0 - 1.25e+18 ohm	10.0 - 1.25e+18 ohm	Average value: 2.55e+16 ohm Grade Count:399
Static Decay	0.0100 - 2.00 sec	0.0100 - 2.00 sec	Average value: 0.673 sec Grade Count:34
Dielectric Constant	2.00 - 6.40	2.00 - 6.40	Average value: 2.64 Grade Count:345
Dielectric Strength	12.0 - 450 kV/mm	305 - 11400 kV/in	Average value: 36.4 kV/mm Grade Count:370
Dissipation Factor	0.0000500 - 0.0690	0.0000500 - 0.0690	Average value: 0.00362 Grade Count:254
Arc Resistance	40.0 - 240 sec	40.0 - 240 sec	Average value: 90.5 sec Grade Count:96
Comparative Tracking Index	100 - 600 V	100 - 600 V	Average value: 353 V Grade Count:254
Hot Wire Ignition, HWI	7.00 - 120 sec	7.00 - 120 sec	Average value: 74.4 sec Grade Count:116
High Amp Arc Ignition, HAI	15.0 - 120 arcs	15.0 - 120 arcs	Average value: 73.0 arcs Grade Count:111
High Voltage Arc-Tracking Rate, HVTR	10.0 - 150 mm/min	0.394 - 5.91 in/min	Average value: 120 mm/min Grade Count:95

Thermal Properties	Metric	English	Comments
CTE, linear	0.000 - 158 µm/m-°C	0.000 - 88.0 µin/in-°F	Average value: 65.8 µm/m-°C Grade Count:580
	5.70 - 126 µm/m-°C @Temperature 60.0 - 138 °C	3.17 - 70.0 µin/in-°F @Temperature 140 - 280 °F	Average value: 32.2 µm/m-°C Grade Count:11
	17.0 - 17.0 µm/m-°C @Temperature 100 - 100 °C	9.44 - 9.44 µin/in-°F @Temperature 212 - 212 °F	Average value: 32.2 µm/m-°C Grade Count:1
	17.0 - 17.0 µm/m-°C @Thickness 3.20 - 3.20 mm	9.44 - 9.44 µin/in-°F @Thickness 0.126 - 0.126 in	Average value: 32.2 µm/m-°C Grade Count:1
CTE, linear, Transverse to Flow	0.000 - 158 µm/m-°C	0.000 - 87.8 µin/in-°F	Average value: 73.4 µm/m-°C Grade Count:256
	126 - 126 µm/m-°C @Temperature 60.0 - 138 °C	70.0 - 70.0 µin/in-°F @Temperature 140 - 280 °F	Average value: 126 µm/m-°C Grade Count:1
Specific Heat Capacity	1.79 - 2.20 J/g-°C	0.428 - 0.526 BTU/lb-°F	Average value: 1.99 J/g-°C Grade Count:14
Thermal Conductivity	0.0270 - 5.01 W/m-K	0.187 - 34.8 BTU-in/hr-ft²-°F	Average value: 0.223 W/m-K Grade Count:146
Maximum Service Temperature, Air	30.0 - 300 °C	86.0 - 572 °F	Average value: 91.8 °C Grade Count:59
Hot Ball Pressure Test	75.0 - 165 °C	167 - 329 °F	Average value: 111 °C Grade Count:52
Deflection Temperature at 0.46 MPa (66 psi)	25.0 - 263 °C	77.0 - 505 °F	Average value: 123 °C Grade Count:538
Deflection Temperature at 1.8 MPa (264 psi)	62.0 - 250 °C	144 - 482 °F	Average value: 104 °C Grade Count:1135
Vicat Softening Point	64.0 - 263 °C	147 - 505 °F	Average value: 117 °C Grade Count:977
Minimum Service Temperature, Air	-50.0 - 23.0 °C	-58.0 - 73.4 °F	Average value: -19.0 °C Grade Count:20
Glass Transition Temp, Tg	-92.0 - 150 °C	-134 - 302 °F	Average value: 66.6 °C Grade Count:35
UL RTI, Electrical	50.0 - 130 °C	122 - 266 °F	Average value: 71.6 °C Grade Count:182
UL RTI, Mechanical with Impact	50.0 - 120 °C	122 - 248 °F	Average value: 68.6 °C Grade Count:182
UL RTI, Mechanical without Impact	50.0 - 130 °C	122 - 266 °F	Average value: 71.7 °C Grade Count:182
Flammability, UL94	HB - 5VA	HB - 5VA	Grade Count:783
Flammability Test	0.960 - 4.50	0.960 - 4.50	Average value: 1.80 Grade Count:5
Flame Spread Index	15.0	15.0	Average value: 15.0 Grade Count:6
NBS Smoke Density	7.00 - 126	7.00 - 126	Average value: 44.1 Grade Count:8
Oxygen Index	18.0 - 39.0 %	18.0 - 39.0 %	Average value: 26.6 % Grade Count:148
Glow Wire Test	650 - 960 °C	1200 - 1760 °F	Average value: 828 °C Grade Count:132
Ring & Ball Softening Point	115 - 135 °C	239 - 275 °F	Average value: 128 °C Grade Count:5
Shrinkage	-3.00 - 1.00 %	-3.00 - 1.00 %	Average value: -0.500 % Grade Count:14

Optical Properties	Metric	English	Comments
Refractive Index	1.56 - 1.60	1.56 - 1.60	Average value: 1.58 Grade Count:55
Optical Density	0.0460	0.0460	Average value: 0.0460 Grade Count:37
Haze	0.270 - 88.0 %	0.270 - 88.0 %	Average value: 4.38 % Grade Count:49
Gloss	5.00 - 100 %	5.00 - 100 %	Average value: 62.6 % Grade Count:89
Transmission, Visible	1.00 - 92.0 %	1.00 - 92.0 %	Average value: 86.4 % Grade Count:125

Processing Properties	Metric	English	Comments
Processing Temperature	40.0 - 335 °C	104 - 635 °F	Average value: 237 °C Grade Count:488
Rear Barrel Temperature	171 - 321 °C	340 - 610 °F	Average value: 219 °C Grade Count:85
Middle Barrel Temperature	170 - 327 °C	338 - 621 °F	Average value: 227 °C Grade Count:90
Front Barrel Temperature	190 - 335 °C	374 - 635 °F	Average value: 243 °C Grade Count:85
Nozzle Temperature	200 - 335 °C	392 - 635 °F	Average value: 290 °C Grade Count:26
Die Temperature	87.8 - 230 °C	190 - 446 °F	Average value: 195 °C Grade Count:6
Mold Temperature	10.0 - 155 °C	50.0 - 311 °F	Average value: 60.0 °C Grade Count:388
Roll Temperature	50.0 - 90.0 °C	122 - 194 °F	Average value: 66.7 °C Grade Count:6
Drying Temperature	48.9 - 121 °C	120 - 250 °F	Average value: 81.1 °C Grade Count:178
Dry Time	2.00 - 8.00 hour	2.00 - 8.00 hour	Average value: 2.86 hour Grade Count:136
Moisture Content	0.0200 - 0.300 %	0.0200 - 0.300 %	Average value: 0.0912 % Grade Count:63
Dew Point	-28.9 °C	-20.0 °F	Average value: -28.9 °C Grade Count:21
Injection Pressure	34.5 - 207 MPa	5000 - 30000 psi	Average value: 87.2 MPa Grade Count:93
Back Pressure	0.172 - 27.6 MPa	24.9 - 4000 psi	Average value: 2.03 MPa Grade Count:101
Shot Size	30.0 - 70.0 %	30.0 - 70.0 %	Average value: 50.0 % Grade Count:23
Vent Depth	0.00254 - 0.00762 cm	0.00100 - 0.00300 in	Average value: 0.00456 cm Grade Count:11
Screw Speed	20.0 - 125 rpm	20.0 - 125 rpm	Average value: 71.6 rpm Grade Count:38

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 disclaimer and 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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