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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 Type XIV Type XV
Density        
Nominal Density ib/ft3.
(kg/m3)
0.75
(12)
1.00
(15)
1.25
(20)
1.50
(24)
2.00
(32)
2.50
(40)
3.00
(48)
Minimum Density ib/ft3.
(kg/m3)
0.70
(12)
.90
(15)
1.15
(18)
1.35
(22)
1.80
(29)
2.40
(38)
3.00
(48)
Thermal Resistance
R Value per Inch
       
ASTM C518 290F.
400)F
750F
3.50
3.30
3.10
4.35
4.17
3.85
4.55
4.25
3.92
4.76
4.55
4.17
5.00
4.76
4.35
5.05
4.85
4.50
5.10
5.05
4.60
Compressive Strength
@10% deformation, min.
       
ASTM D1621 psi
(kPa)
5.0
(35)
10.0
(69)
13.0
(90)
15.0
(104)
25.0
(173)
40.0
(276)
60.0
(414)
Flextural Strength, min.        
ASTM C203 psi
(kPa)
10.0
(69)
25
(173)
30
(208)
35
(248)
50
(345)
60
(414)
75
(517)
Water Vapor Permeance
(max. perm, 1")
       
ASTM E96 5.0 5.0 3.5 3.5 2.5 2.5 2.5
Water Absorption
(max. % vol.)
       
ASTM C272 4.0 4.0 3.0 3.0 2.0 2.0 2.0
Capitallarity        
none none none none none none none
Flame Spread        
ASTM E84 < 25 < 25 < 25 < 25 < 25 < 25 < 25
Smoke Developed        
ASTM E84 < 450 < 450 < 450 < 450 < 450 < 450 < 450
Max Service
Temperature
       
Long Term
Incremittent
0F
0F
167
180
167
180
167
180
167
180
167
180
167
180
167
180