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Physical Properties of EPS
|
Specification Reference (ASTM-C578-95)
|
Type I
(1#)
|
Type VIII
(1 1/4#)
|
Type II
(1 1/2#)
|
Type IX
(2#)
|
| Property: |
Units |
ASTM Test |
|
| Density, Min. |
(pcf) |
C303 or
D1622
|
|
0.90 |
1.15 |
1.35 |
1.80 |
Thermal Conductivity
"K Factor"
|
BTU/(hr)
(sqft)(°F/in)
|
C177 or
C518
|
@ 25 °F |
0.238 |
0.227 |
0.217 |
0.208 |
| @ 40 °F |
0.250 |
0.238 |
0.227 |
0.217 |
| @ 75 °F |
0.277 |
0.263 |
0.250 |
0.238 |
Thermal Resistance
"R Value"
|
One inch
thickness
|
C177 or
C518
|
@ 25 °F |
4.20 |
4.40 |
4.60 |
4.80 |
| @ 40 °F |
4.00 |
4.20 |
4.40 |
4.60 |
| @ 75 °F |
3.60 |
3.80 |
4.00 |
4.20 |
|
Strength Properties
|
Type I
(1#)
|
Type VIII
(1 1/4#)
|
Type II
(1 1/2#)
|
Type IX
(2#)
|
| Property: |
Units |
ASTM Test |
|
Compressive
@ xx% deflection
|
psi |
D1621 |
@ 1/2% |
3.5 |
4.3 |
6.0 |
8.0 |
| @ 1% |
7.0 |
8.5 |
12.0 |
16.0 |
| @ 5% |
8.0 |
11.0 |
12.0 |
20.0 |
| @ 10% |
10.0 |
13.0 |
15.0 |
25.0 |
| Flexural |
psi |
C203 |
|
25 |
32 |
40 |
55 |
| Tensile |
psi |
D1623 |
|
16 |
17 |
18 |
23 |
| Shear |
psi |
D732 |
|
18 |
23 |
26 |
33 |
| Shear Modulus |
psi |
--- |
|
280 |
370 |
460 |
600 |
| Modulus of Elasticity |
psi |
--- |
|
180 |
250 |
320 |
460 |
Allowable
Compressive
Stress
|
psi |
. |
Long-Term Load |
2.1 |
3.3 |
4.5 |
7.0 |
| Short-Term Load |
4.0 |
5.0 |
5.9 |
9.1 |
| Rolling Loads |
8.0 |
10.0 |
11.8 |
18.2 |
| Young's modulus |
psi |
. |
. |
573 |
739 |
1000 |
1449 |
Modulus of
Subgrade
Reaction
|
[k],pci |
. |
. |
200 |
240 |
280 |
460 |
| Poisson's Ratio |
[v] |
. |
. |
.086 |
.103 |
.126 |
.165 |
Coefficient of
Friction
|
. |
. |
. |
0.5-0.7 |
0.5-0.7 |
0.5-0.7 |
0.5-0.7 |
|
Moisture Resistance
|
Type I
(1#)
|
Type VIII
(1 1/4#)
|
Type II
(1 1/2#)
|
Type IX
(2#)
|
| Property: |
Units |
ASTM Test |
|
Water Vapor Permeance,
max. perm.
|
Perms
(ng/Pa•s•m²) |
E 96 |
. |
5.0
(287) |
3.5
(201) |
3.5
(201) |
2.0
(115) |
| Absorption by Volume, max. |
% |
C272 |
. |
< 4.0 |
< 3.0 |
< 3.0 |
< 2.0 |
| Capillarity |
--- |
--- |
. |
None |
None |
None |
None |
| Buoyancy |
lbs/ft³ |
. |
. |
60 |
60 |
60 |
60 |
|
Other Properties
|
Type I
(1#)
|
Type VIII
(1 1/4#)
|
Type II
(1 1/2#)
|
Type IX
(2#)
|
| Property: |
Units |
ASTM Test |
|
| Coeff. of Thermal Expansion |
in./(in) (°F) |
D696 |
. |
0.000035 |
0.000035 |
0.000035 |
0.000035 |
| Max. Service Temperature |
°F |
--- |
Long-Term |
167 |
167 |
167 |
167 |
| Intermittent |
180 |
180 |
180 |
180 |
| Flame Spread max. 6" |
|
UL® (BRYX) |
|
20 |
20 |
20 |
20 |
| Smoke Development |
|
UL® (BRYX) |
|
300 |
300 |
300 |
300 |
All values based on data from Huntsman Chemical Corporation,
Styrochem International, NOVA Chemical Corporation and BASF Corporation.
Federal Trade Commision Ruling: Use the 75 F R-Value
when calculating R-Values for residential construction.
Design Considerations:
- DO NOT COMPARE polyisocyanurate
conditioned R-Values by RIC-TIMA and PIMA to EPS R-Values by ASTM C-578.
- ASK for a 20 year 100% R-Value Warranty.
- Flammability: Like many construction materials, EPS is combustible.
It should not be exposed to flame or other ignition sources. Current
model building code requirements should be met for adequate protection
or seperation from occupied areas.
- Water Absorption Properties: EPS water absorption is low.
Moisture takes the path of least resistance and travels around individual
beads rather than through them; the non-interconnecting cell structure
prevents capillary absorption.
- Water Vapor Transmission: EPS has low permeability but is not considered
a vapor barrier.
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3200 9th Ave. SE Watertown, South Dakota 57201 Ph. 605/886-8084 Tf. 800/658-3444 Fx. 605/886-8099 |
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