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 moisture 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.
D 303 or D 1622
0.90 - 1.14
1.80 - 2.20
Thermal Conductivity - K Factor
25F BTU in/hr ft2 °F
C 177 or C 51
Thermal Resistance - R-Value @ 1 in
25F hr ft2 °F/BTU
Compressive 10% Deformation
10 - 14
25 - 33
25 - 30
1.80 - 2.20
16 - 20
23 - 27
18 - 22
33 - 37
280 - 320
600 - 640
Modulus of Elasticity
180 - 220
460 - 500
Water Vapor Transmission
2.0 - 5.0
0.6 - 2.0
Water Absorption (vol.)
Coefficient of Thermal Expansion
Maximum Service Temperature
Permatherm Surface Burning Characteristics (per UL Listings)
Flame Spread for 1 lb/ft3 up to 2 inch Thickness
Smoke Development for 1 lb/ft3 up to 2 inch Thickness
Flame Spread for 2 lb/ft3 up to 5 inch Thickness
Smoke Development for 2 lb/ft3 up to 5 inch Thickness
*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.