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ASTM
C 578-06
"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 578-03a. 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 |
1.6 |
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 |
1.1 |
0.3% |
2 |
24 |
< 75 |
< 450 |
| XII |
XPS |
1.2 |
4.6 |
15 |
40 |
1.1 |
0.3% |
2 |
24 |
< 75 |
< 450 |
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* ASTM C 578-03a
also classifies molded expanded polystyrene foam (EPS) material.
This product is made with a different manufacturing process and
is sometimes referred to as beadboard.
**
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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