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PHYSICAL PROPERTIES OF EXPANDED POLYSTYRENE, (EPS)
Federal Specifications: ASTM C 578-92
Minimum and Maximum allowable values. |
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PROPERTY |
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UNITS |
ASTM TEST |
TYPE I |
TYPE VIII |
TYPE II |
TYPE IX |
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Density, Nominal |
|
pcf |
C303 or
D1622 |
1.00# |
1.25# |
1.50# |
2.00# |
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Density, Minimum |
pcf |
0.90 |
1.15 |
1.35 |
1.80 |
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Density, Range |
pcf |
0.90-1.14 |
1.15-1.34 |
1.35-1.79 |
1.80-2.20 |
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Thermal Conductivity
K Factor |
@ 25° F |
BTU/(hr) (sq.ft.)(F/in) |
C177 or
C518 |
0.23 |
0.22 |
0.21 |
0.20 |
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@ 40° F |
0.24 |
0.235 |
0.22 |
0.21 |
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@ 75° F |
0.26 |
0.255 |
0.24 |
0.23 |
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Thermal Resistance
R-value* |
@ 25° F |
at 1 inch thickness |
- |
4.35 |
4.54 |
4.76 |
5.00 |
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@ 40° F |
4.17 |
4.25 |
4.55 |
4.76 |
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@ 75° F |
3.85 |
3.92 |
4.17 |
4.35 |
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Compressive 10%Deformation |
|
psi |
D1621 |
10-14 |
13-18 |
15-21 |
25-33 |
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Flexural Strength |
psi |
C203 |
25-30 |
30-38 |
40-50 |
50-75 |
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Tensile Strength |
psi |
D1623 |
16-20 |
17-21 |
18-22 |
23-27 |
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Shear Strength |
psi |
- |
18-22 |
23-25 |
26-32 |
33-37 |
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Shear Modulus |
psi |
- |
280-320 |
370-410 |
460-500 |
600-640 |
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Modulus of Elasticity |
psi |
- |
180-220 |
250-310 |
320-360 |
460-500 |
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Water Absorption |
% |
C272 |
<4.0% |
<3.0% |
<3.0% |
<2.0% |
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Water Vapor Transmission |
Perm. In |
E96 |
2.0-5.0 |
1.5-3.5 |
1.0-3.5 |
0.6-2.0 |
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*R-value means the
resistance to heat flow. The higher the R-value, the
greater the resistance to heat flow. Typical tested
R-values are based on the data provided by Nova Chemical
Co., BASF Corp., and Huntsman Chemical Company. |
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Additional Information on All Types |
Capillarity-None |
| Maximum
Service Temperature |
Long Term
Exposure 167° F, Intermittent Exposure 180° F |
| Oxygen Index |
ASTM test D
2863 = 24.0% |
| Coefficient
of Thermal Expansion |
ASTM test D
696 = 0.000035in./(in.)(F) |
|
Buoyancy-Floatation |
Minimum 50
lbs / cubic foot |
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BUILDING CODE
CLASSIFICATION:
ICC
ESR-1349
Factory Mutual number 4450
U.L. File #R12290 Control #85TO Classification BRYX |
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FLAMMABILITY WARNING:
Expanded polystyrene (EPS) materials sold for construction
use have a fire retardant modifier but are considered
combustible, as are all organic materials. They must not
be stored or installed near open flame or any other source
of ignition. In addition, when EPS insulation board is
installed in the interior of a structure it must be
protected by a proper thermal barrier, and the installer
must review applicable local, state and federal building
codes to determine the correct thermal barrier for the
particular application. |
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ADJOINING MATERIALS
WARNING:
Expanded polystyrene (EPS) is subject to attack by liquid
solvent or some solvent base adhesives and other liquid
products such as gas, diesel, etc. Care should also be
taken to separate any coal tar pitch products or coal tar
pitch vapors from any direct contact with EPS foam. |
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