EPS (Expanded Polystyrene) is a CLOSED cell material.
EPS is made up of Hydrogen and Carbon atoms with the addition of a blowing agent (Pentane) used only in the manufacturing process. The blowing agent dissipates as the material cures.
R-Values and Compressive strengths increase with density.
Tests have shown that when burned, EPS is no more toxic than wood or paper burning. The by-product of burning EPS is Carbon Monoxide.
Maximum Temp exposure to EPS should not be higher than 167 degrees F for extended periods, nor higher than 184 degrees F at any time.
EPS will not support bacterial or fungus growth. EPS has no food value.
Flame Spread & Smoke Developed Ratings vary slightly depending on Raw Material manufacturer.
***** As a general rule, Flame spread is 15 and Smoke Developed is 150 to 250.
Expanded Polystyrene (EPS) products are produced and distributed by Hendren Plastics, Inc. in a variety of shapes and sizes for numerous uses. These include Packaging, Insulation and Flotation.
| Density Chart | |||||
|---|---|---|---|---|---|
| Nominal | pcf | 1 # | 1.25 # | 1.5 # | 2 # |
| Actual | pcf | 0.9 | 1.15 | 1.35 | 1.8 |
| R Value | 25 F | per inch | 4.2 | 4.4 | 4.6 | 4.8 | R Values indicate the resistance to the transfer of heat. |
| 75F | 3.6 | 3.8 | 4 | 4.2 | The higher the R Value, the higher the resistance. | ||
| K Factor | 40F | BTU/(hr) | 0.24 | 0.235 | 0.22 | 0.21 | K Factors are not used or asked for very often. They deal with |
| 75F | (sqft)(F/in) | 0.26 | 0.255 | 0.24 | 0.23 | the Thermal Conductivity of insulation. | |
| Compressive | psi | 10 | 13 | 15 | 25 | Multiply the #'s by 144 to find pounds per sq foot | |
| Strength @ 10% deform. | These weights will compress the material approx 10% | ||||||
| Flexural | psi | 25 | 30 | 40 | 50 | Multiply the #'s by 144 to find pounds per sq foot | |
| Strength | |||||||
| Water Vapor | max perm | 5 | 3.5 | 3.5 | 2 | Shows air moisture transfer through EPS | |
| Permeability | per inch | ||||||
| Water | % by Vol | 4 | 3 | 3 | 2 | Maximum amount of water absorbed in % of volume | |
| Absorption | |||||||
| Bouyancy | lb/cuft | 60 | 60 | 60 | 60 | lbs/cuft to push EPS just below water surface. | |
| Allow at least 50% safety factor |
| Other data also | available on request: |
|---|---|
| Tensile Strength | Dimensional Stability |
| Shear Strength | Bond Strength |
| Shear Modulus | Sound Absorption |
| Modulus of Elasticity | Coeffecient of Thermal Expansion |
| Capillarity | Oxygen Index |