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Expanded Polystyrene (EPS)

What is Expanded Polystyrene (EPS)?

Expanded Polystyrene or EPS is a light weight rigged closed cell insulation material. Because of its ability to trap air inside its cells, it makes for the best insulation on the market with high R-values and moister resistance. EPS has Constant Thermal resistance to create long term R-value. This means energy and money savings for your project for years to come. EPS has always been CFC and HCFC free. Permatherm’s EPS is 100% recycled to significantly reduce the amount of EPS in landfills. EPS is the center of Permatherm’s insulated metal panels allowing you to have the best insulated building possible.

Benefits of PermaTherm’s EPS Insulated Cores:

  • High Thermal Resistance – EPS is an excellent insulator for any building
  • Long-lasting Thermal Conductivity – in layman terms, the heat energy transfer is blocked which allows your building to stay at desired temperatures and use less electricity.
  • Lightweight Insulation – with a lighter core, our insulated metal panels are easier to ship, store, and handle during installs on the job site.
  • Better for the Environment – better energy savings, can be recycled, and less on the job waste.

As seen below, PermaTherm’s EPS foam insulation for panel products were tested by Underwriters Laboratories, Inc. and meet the Standard Mechanical Code and the International Mechanical Code.

Property
Units
ASTM Test
Type I
Type IX
Density, minimum 
lb/ft3
D 303 or D 1622
0.90
1.80
Density Range
lb/ft3
0.90 - 1.14
1.80 - 2.20
Thermal Conductivity - K Factor
25F BTU in/hr ft°F
C 177 or C 51
0.23
0.20
40F
0.24
0.21
75F
0.26
0.23
Thermal Resistance - R-Value @ 1 in
25F hr ft°F/BTU
4.35
5.00
40F
4.17
4.76
75F
0.26
0.23
Strength
Properties
ASTM Test
Type I
Type IX
Compressive 10% Deformation
lb/in2
D 1621
10 - 14
25 - 33
Flexural
lb/in2
C 203
25 - 30
1.80 - 2.20
Tensile
lb/in2
D 1623
16 - 20
23 - 27
Shear
lb/in2
D 723
18 - 22
33 - 37
Shear Modulus
lb/in2
280 - 320
600 - 640
Modulus of Elasticity
lb/in2
180 - 220
460 - 500
Moisture
Resistance
ASTM Test
Type I
Type IX
Water Vapor Transmission
perm-in
E 96
2.0 - 5.0
0.6 - 2.0
Water Absorption (vol.)
%
C 272
< 4.0
< 2.0
Capillarity
--
--
--
--
Coefficient of Thermal Expansion
(in/in)/°F
D 696
0.000035
0.000035
Maximum Service Temperature
°F
Long-term Exposure
167
167
Intermittent Exposure
180
180
Oxygen Index
%
D 2863
24.0
24.0
Permatherm Surface Burning Characteristics (per UL Listings)
Flame Spread for 1 lb/ft3 up to 2 inch Thickness
E 84
5
Smoke Development for 1 lb/ft3 up to 2 inch Thickness
50
Flame Spread for 2 lb/ft3 up to 5 inch Thickness
E 84
5
Smoke Development for 2 lb/ft3 up to 5 inch Thickness
E 84
160

*Flame Spread and Smoke Development recorded while the material remained in the original test position. Surface burning characteristics derived from ASTM E-84 are not intended to reflect hazards presented by this product under actual conditions. In no event, the manufacturer assumes liability beyond the purchase price or replacement of material proven to be defective and reported in a timely fashion, but not longer than six (6) months after shipment. Only the senior executive of PermaTherm has the authority to alter or extend these conditions.

PermaTherm is here to answer any questions you may have about our EPS and panels. Our team is here to support you throughout your construction process. Give us a call today!