Overview of materials for Expanded Polystyrene (EPS)

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Overview of materials for Expanded Polystyrene (EPS)
Categories:	Polymer; Thermoplastic; Polystyrene (PS); Expanded Polystyrene (EPS)
Material Notes:	This property data is a summary of similar materials in the MatWeb database for the category "Expanded Polystyrene (EPS)". 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	Original Value	Comments

Density	0.00310 - 3.50 g/cc	Average value: 0.212 g/cc Grade Count:385
Filler Content	0.300 - 10.5 %	Average value: 5.17 % Grade Count:37
Water Absorption	0.0300 - 9.00 %	Average value: 0.397 % Grade Count:50
Particle Size	100 - 3150 µm	Average value: 983 µm Grade Count:95
Water Vapor Transmission	50.0 - 200 g/m²/day	Average value: 126 g/m²/day Grade Count:6
Viscosity	1.65 - 1.70 cP	Average value: 1.67 cP Grade Count:9
Permeability	0.500 - 3.50	Average value: 1.79 Grade Count:19
Maximum Moisture Content	0.200 - 0.500	Average value: 0.403 Grade Count:40
Melt Flow	1.80 - 4.00 g/10 min	Average value: 2.53 g/10 min Grade Count:3
Outgassing - Total Mass Loss	1.00 - 2.50 %	Average value: 1.39 % Grade Count:7
Vapor Pressure	0.685 bar	Average value: 0.685 bar Grade Count:9

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	0.0800 - 1.10 MPa	Average value: 0.464 MPa Grade Count:47
Tensile Strength, Yield	47.1 - 51.0 MPa	Average value: 48.4 MPa Grade Count:3
Elongation at Break	5.00 - 13.4 %	Average value: 8.45 % Grade Count:21
Creep Strength	0.0600 - 0.300 MPa	Average value: 0.156 MPa Grade Count:6
Modulus of Elasticity	0.00650 - 2.65 GPa	Average value: 0.484 GPa Grade Count:8
Flexural Yield Strength	0.0750 - 3.00 MPa	Average value: 0.433 MPa Grade Count:142
Flexural Modulus	0.00628 - 0.0342 GPa	Average value: 0.0153 GPa Grade Count:20
Flexural Strain at Break	6.90 - 14.1 %	Average value: 10.8 % Grade Count:16
Compressive Yield Strength	0.0392 - 10.9 MPa	Average value: 0.461 MPa Grade Count:156
Compressive Modulus	0.00500 - 0.0400 GPa	Average value: 0.0177 GPa Grade Count:6
Shear Strength	0.200 - 0.300 MPa	Average value: 0.290 MPa Grade Count:5
Adhesive Bond Strength	0.100 - 0.400 MPa	Average value: 0.165 MPa Grade Count:5
Izod Impact, Notched	0.216 - 0.245 J/cm	Average value: 0.235 J/cm Grade Count:3
Puncture Energy	41.4 - 316 J	Average value: 103 J Grade Count:16
Tear Strength	1.05 - 6.10 kN/m	Average value: 2.74 kN/m Grade Count:17
K Factor (Wear Factor)	54.0 - 59.0	Average value: 56.8 Grade Count:13
Compression Set	32.2 - 45.7 %	Average value: 41.1 % Grade Count:20

Electrical Properties	Original Value	Comments
Surface Resistance	1.00e+10 - 1.00e+12 ohm	Average value: 2.44e+11 ohm Grade Count:5

Thermal Properties	Original Value	Comments
CTE, linear	63.0 - 80.0 µm/m-°C	Average value: 66.3 µm/m-°C Grade Count:33
CTE, linear, Transverse to Flow	60.0 µm/m-°C	Average value: 60.0 µm/m-°C Grade Count:6
Thermal Conductivity	0.0270 - 0.0450 W/m-K	Average value: 0.0353 W/m-K Grade Count:106
	0.0240 - 0.0370 W/m-K @Temperature -80.0 - 50.0 °C	Average value: 0.0312 W/m-K Grade Count:5
	0.0240 - 0.0370 W/m-K @Temperature -80.0 - 50.0 °C	Average value: 0.0312 W/m-K Grade Count:1
	0.0240 - 0.0370 W/m-K @Thickness 50.0 - 50.0 mm	Average value: 0.0312 W/m-K Grade Count:1
Insulation R Value	3.66 - 20.0	Average value: 8.05 Grade Count:7
	>= 5.40 @Temperature -3.89 - 4.44 °C	Average value: 9.35 Grade Count:3
	>= 5.40 @Thickness 25.4 - 76.2 mm	Average value: 9.35 Grade Count:3
Maximum Service Temperature, Air	70.0 - 118 °C	Average value: 83.7 °C Grade Count:53
Vicat Softening Point	99.0 - 104 °C	Average value: 101 °C Grade Count:3
Softening Point	70.0 °C	Average value: 70.0 °C Grade Count:26
Decomposition Temperature	220 °C	Average value: 220 °C Grade Count:26
Flame Spread	1.20 - 136 mm/min	Average value: 53.6 mm/min Grade Count:13
Flash Point	-56.0 °C	Average value: -56.0 °C Grade Count:26
Ignition Temperature	285 °C	Average value: 285 °C Grade Count:26

Optical Properties	Original Value	Comments
Transmission, Visible	90.0 %	Average value: 90.0 % Grade Count:3

Processing Properties	Original Value	Comments
Moisture Content	0.500 - 3.00 %	Average value: 1.06 % Grade Count:37

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 go back to viewing the property data in MatWeb's normal format.

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O4850 / 78420

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