Float Drum Contents: All encasements are filled with polystyrene (EPS) beads. The EPS beads are steamed to gether to provide less water absorption and solid core for structural strength. The EPS contents have a 0.9-1.2 lbs. per cubic foot density with water absorption not to exceed three pounds per cubic foot in accordance with the Hunt Water Absorption Test. It will not sink or contaminate the water when punctured. The EPS contents conforms to the ASTM C-578 and the Underwriters Laboratory standards. Regarding fire resistance; it passes the UL723, UL1975 and ASTM E84 tests. Below are other ASTM test results:
| Properties | ASTM Test | Units | Value |
| Density | C-303 | Min lb./ft3 | 0.90 |
|
Thermal
Resistance @ 25š F (-3.9š C) 25š F (-3.9š C) 25š F (-3.9š C) 25š F (-3.9š C) |
C-177
or C-518 C-158 |
Min R for 1" Thickness |
4.20 4.00 3.60 3.25 |
| Compressive resistance at Yield or 10% Deformation | D-1621 | Min psi | 10.0 |
| Flexural Strength. | C-203 | Min psi | 25.0 |
| Water Vapor Permeability | E-96 | Max perm-in | 5.0 |
| Water Absorption | C-272 | & by Vol Max | 4.0 |
| Dimensional Stability | Max % | 2.0 | |
| Oxygen Index | D-2863 | Min % | 24.0 |
| Coefficient of Thermal Expansion | D-696 | In/in/šF | 0.000035 |
| Flash Ignition Temperature | D-1929 | šF | 824 |
| Auto-Ignition Temperature | D-1929 | šF | 896 |
| BTU Content | NFPA 259 | BTU/lb. | 17,245 |
