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Expanded Polystyrene in PDF format.
Expanded Polystyrene (EPS) Data Sheet
TYPICAL PHYSICAL PROPERTIES OF EXPANDED POLYSTYRENE
| EPS Properties | ||||||||
|---|---|---|---|---|---|---|---|---|
| Property | Units | ASTM Test | Specification reference: ASTM C 578 | |||||
| Type XI | Type I | Type VIII | Type II | Type IX | ||||
| Density | ||||||||
| Minimum | lb/ft3 | D1622 | 0.70 | 0.90 | 1.15 | 1.35 | 1.80 | |
| Range | lb/ft3 | D1622 | 0.70-0.89 | 0.9-1.14 | 1.15-1.34 | 1.35-1.79 | 1.80-2.20 | |
| Thermal Conductivity (k Factor) | ||||||||
| at 40°F | BTU/hr. (ft3)(°F/in.) |
C518 | 0.28 | 0.24 | 0.23 | 0.22 | 0.21 | |
| at 75°F | BTU/hr. (ft3)(°F/in.) |
C518 | 0.30 | 0.26 | 0.25 | 0.24 | 0.23 | |
| Thermal Resistance (R-Value) | ||||||||
| at 40°F | at 1" thickness | 3.6 | 4.17 | 4.25 | 4.55 | 4.76 | ||
| at 75°F | at 1" thickness | 3.3 | 3.85 | 3.92 | 4.17 | 4.35 | ||
| Strength Properties | ||||||||
| Compressive 10% Deformation | psi | D1621 | 5-9 | 10-14 | 13-18 | 15-21 | 25-33 | |
| Flexural | psi | C203 | 10-18 | 25-30 | 32-38 | 40-50 | 55-75 | |
| Tensile | psi | D1623 | 14-18 | 16-20 | 17-21 | 18-22 | 23-27 | |
| Shear | psi | D732 | 11-13 | 18-22 | 23-25 | 26-32 | 33-37 | |
| Shear Modulus | psi | ---- | 190-230 | 280-320 | 370-410 | 460-500 | 600-640 | |
| Modulus of Elasticity | psi | ---- | 110-150 | 180-220 | 250-310 | 320-360 | 460-500 | |
| Moisture Resistance | ||||||||
| WVT | perm.in | E96 (Proc A) |
1.9-3.9 | 1.2-3.0 | 1.1-2.8 | 0.9-2.5 | 0.6-1.5 | |
| Absorption (vol.) | % | C272 | <4.0 | <3.5 | <3.0 | <3.0 | <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 Serive Temperature | ||||||||
| Long Term | °F | 167 | 167 | 167 | 167 | 167 | ||
| Intermittent | °F | 180 | 180 | 180 | 180 | 180 | ||
| Oxygen Index | % | D2863 | 24 | 24 | 24 | 24 | 24 | |
| Dimensional Stability | % Change | D2126 Proc C & E |
max 2.0 |
max 2.0 |
max 2.0 |
max 2.0 |
max 2.0 |
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