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Typical Physical Properties of EPS Insulation

Specification Reference ASTM 578-92  

  TYPE XI

TYPE I

TYPE VIII 

TYPE II 

TYPE IX  

Property  

Units

ASTM Test

         
Density, minimum  

(pcf) 

D303 or D1622

  0.75

 0.90

 1.15

 1.35

 1.80

Density, range

 

 

 

   0.75 - 0.89

 0.90 - 1.14

 1.15 - 1.34

 1.35 - 1.79

 1.80 - 2.20

Thermal Conductivity at 25F 

BTU/(hr.)

C177 or C518

  0.28 0.22 0.22 0.21 0.20
K Factor at 40F 

(sq.ft.)(F/in.) 

    0.30 0.24 0.235 0.22 0.21
  at 75F        0.32 0.26 0.255 0.24 0.23
  at 110F        0.34 0.28 0.275 0.26 0.25
Thermal Resistance at 25F 

at 1 inch

 

  3.45 4.35 4.54 4.76 5.00
* R - Value at 40F 

thickness

 

  3.30  4.17 4.25 4.55 4.76
  at 75F  

 

  3.10 3.85 3.92 4.17 4.35
  at 110F        2.90 3.57 3.64 3.85 4.00
Strength Properties                
Compressive 10% deformation  

psi

D1621

  5 to 8  10 to 14 13 to 18 15 to 21 25 to 33
Flexural  

psi

C203

 10 to 20 25 to 30 30 to 38 40 to 50 50 to 75
Tensile  

psi 

D1623

 10 to 15 16 to 20 17 to 21 18 to 22 23 to 27
Shear  

psi

D723

 14 to 17 18 to 22 23 to 25 26 to 32 33 to 37
Shear Modulus  

psi

   200 to 250 280 to 320 370 to 410 460 to 500 600 to 640
Modulus of Elasticity  

psi

   100 to 150 180 to 220 250 to 310 320 to 360 460 to 500
Moisture Resistance                
WVT  

perm. In

E96

 2.0 - 5.0 2.0 - 5.0 1.5 - 3.5 1.0 - 3.5 0.6 - 2.0
Absorbtion (vol.)  

%

C272

 less than 4.0 less than 4.0 less than 3.0 less than 3.0 less than 2.0
Capillarity        none none none  none  none 
Coefficient of Thermal Expansion  

in./(in)(F)

D696

 0.000035 0.000035 0.000035  0.000035  0.000035 
Maximum Surface Temperature                

        long-term exposure

 

Degrees F

   167 167 167 167 167

        Intermittent exposure

       180 180 180 180 180
Oxygen Index  

%

D2863

 24.0 24.0 24.0 24.0 24.0
                 
* R - Value means resistance to heat flow. The higher the R - Value, the resistance to heat flow            

Though the information presented in this bulletin is offered in good faith and believed to be accurate, ALL STATEMENTS AND SUGGESTIONS ARE MADE WITHOUT WARRANTY, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED WARRANTIES OF MERCHATABILITY OF FITNESS FOR ANY PURPOSE.

WARING! EPS FOAM IS FLAMMABLE. Modified EPS like most plastic foams is flammable. Do not expose EPS to open flames or other direct or indirect high temerature igintion sources such as burning operations, welding, burning cigarettes, space heaters or naked lights. When burning EPS will consume oxygen, releasing great heat and smoke and potentially toxic gases such as carbon monoxide and carbon dioxide. Installation should comply with local building codes.

Caution: Polystyrene is susceptible to attack by petroleum products and solvents and should not be used where it will be subjected to gasoline, oil or solvent spill.

CODE COMPLIANCE: POWERFOAM EPS COMPLIES WITH THE MAJOR MODEL BUILDING CODES AND IS ICBO LISTED, UL CLASSIFIED, FM ACCEPTED AND RADCO APPROVED.



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