Property

Units

Density

(PCF)

ASTM Test

1.0

1.25

1.5

2.0

Thermal Conductivity

at 25°F

BTU/(hr.)

0.23

0.220

0.21

0.20

C-177 or

K Factor

at 40°F

(sq. ft.) (F/in.)

0.24

0.235

0.22

0.21

C158

at 75°F

0.26

0.255

0.24

0.23

Thermal Resistance

at 25°F

per inch

4.35

4.54

4.76

5.00

R. Value

at 40°F

thickness

4.17

4.25

4.55

4.76

at 75°F

3.85

3.92

4.17

4.35

Strength Properties
Comprehensive (10% Deformation

psi

10-14

13-18

15-21

25-33

D1621

Flexural

psi

25-30

32-38

40-50

55-75

C203

Tensile

psi

16-20

17-21

18-22

23-27

D1623

Shear

psi

18-22

23-25

26-32

33-37

D732

Shear Modulus

psi

280-320

370-410

460-500

600-640

-

Modulus of Elasticity

psi

180-220

250-310

320-360

460-500

-

Coefficient of Thermal Expansion

in./(in.)(F)

0.000035

0.000035

0.000035

0.000035

D696

Moisture Resistance

Water Vapor Transmission

Perm. In.

1.2-3.0

1.1-2.8

0.9-2.5

0.6-1.5

C355

Absorption (Vol.)

%

Less than

Less than

Less than

Less than

C272

2.5

2.5

2.0

1.5

-

Capillarity

-

None

None

None

None

-

Maximum Service

Long Term

167

167

167

167

-

Temperature

Intermittent °F

180

180

180

180

-