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ASTM
C 578-08b
"Standard Specification for Rigid, Cellular Polystyrene
Thermal Insulation"—This standard has been
approved for use by agencies of the Department of Defense.
This table is recreated, in part, to show only XPS information listed
on the more complete table, ASTM C 578-08b. The standard is copyrighted,
so please obtain the actual standard from ASTM for more complete
information pertaining to this table and the test methods used tto
derive these values.
Type |
Product
* |
Density
pcf |
R-Value
@
75 degrees F |
Compressive
Strength
(psi) |
Flexural
Strength (psi) |
Water
Vapor
Permeance
(perm) |
Water
Moisture
Absorption (%) |
Dimensional
Stability (%) |
Oxygen
Index
(%) |
**
E 84
Flame Spread |
**
E 84
Smoke
Development |
| IV |
XPS |
1.55 |
5 |
25 |
50 |
1.1 |
0.3% |
2 |
24 |
< 75 |
< 450 |
| V |
XPS |
3 |
5 |
100 |
100 |
1.1 |
0.3% |
2 |
24 |
< 75 |
< 450 |
| VI |
XPS |
1.8 |
5 |
40 |
60 |
1.1 |
0.3% |
2 |
24 |
< 75 |
< 450 |
| VII |
XPS |
2.2 |
5 |
60 |
75 |
1.1 |
0.3% |
2 |
24 |
< 75 |
< 450 |
| X |
XPS |
1.3 |
5 |
15 |
40 |
1.5 |
0.3% |
2 |
24 |
< 75 |
< 450 |
| XII |
XPS |
1.2 |
4.6 |
15 |
40 |
1.5 |
0.3% |
2 |
24 |
< 75 |
< 450 |
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* ASTM C
578-08b also classifies molded expanded polystyrene foam (EPS)
material in "Types" not listed here. This product is made with
a different manufacturing process and is sometimes referred to
as beadboard. Please refer to the standard
for EPS-related performance.
**
ASTM E 84 governs flame spread and smoke development properties.
We have inserted in in this table because it is so commonly requested.
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