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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