Manufacturers of EPS - Expanded Polystyrene
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PHYSICAL PROPERTIES OF EXPANDED POLYSTYRENE, (EPS)
Federal Specifications: ASTM C 578-92
Minimum and Maximum allowable values.

PROPERTY

 

UNITS

ASTM TEST

TYPE I

TYPE VIII

TYPE II

TYPE IX

Density, Nominal   pcf

C303 or

D1622
1.00# 1.25# 1.50# 2.00#
Density, Minimum pcf 0.90 1.15 1.35 1.80
Density, Range pcf 0.90-1.14 1.15-1.34 1.35-1.79 1.80-2.20

Thermal Conductivity

K Factor

@ 25 F BTU/(hr) (sq.ft.)(F/in) C177 or

C518

0.23 0.22 0.21 0.20
@ 40 F 0.24 0.235 0.22 0.21
@ 75 F 0.26 0.255 0.24 0.23

Thermal Resistance

R-value*

@ 25 F at 1 inch thickness - 4.35 4.54 4.76 5.00
@ 40 F 4.17 4.25 4.55 4.76
@ 75 F 3.85 3.92 4.17 4.35
Compressive 10%Deformation   psi D1621 10-14 13-18 15-21 25-33
Flexural Strength psi C203 25-30 30-38 40-50 50-75
Tensile Strength psi D1623 16-20 17-21 18-22 23-27
Shear Strength psi - 18-22 23-25 26-32 33-37
Shear Modulus psi - 280-320 370-410 460-500 600-640
Modulus of Elasticity psi - 180-220 250-310 320-360 460-500
Water Absorption % C272 <4.0% <3.0% <3.0% <2.0%
Water Vapor Transmission Perm. In E96 2.0-5.0 1.5-3.5 1.0-3.5 0.6-2.0
*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.
 
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
 
BUILDING CODE CLASSIFICATION:
ICC
ESR-1349
Factory Mutual number 4450
U.L. File #R12290 Control #85TO Classification BRYX

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.
 
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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