EIA
GEOMEMBRANES
Introduction
EIA
(Ethylene Interpolymer Alloy) is more commonly known by trademarked
names such as Coolgard, XR-5, and UltraTech. It is an alloy of
PVC and KEE (Ketone Ethylene Ester, also known as Elvaloy) which
is essentially a polymeric non-liquid plasticizer. Therefore it
is much more tightly bound and will not volatilize out of the PVC.
EIA geomembranes are more resistant to hydrocarbons than straight
PVC, and can therefore be left exposed. Typically they are reinforced.
The
original NSF 54 (1993) generic specifications for reinforced EIA
are shown in Table 1. However, NSF
54 has since been withdrawn. Consequently, Table
2 shows Cooley Engineered Geomembrane's present (2001) specifications
for its Coolgard EIA geomembrane.
Seams
- The old NSF 54 specifications (now withdrawn) are shown in Table
3, and the Cooley specifications are shown in Table
4. Note that the Cooley specification uses ASTM
D751 for shear testing not the usual D6392 for
unreinforced material. The ASTM D751 test is a grab-type test,
therefore requiring a much longer seam sample.
|
Property |
Test
Method |
Value |
|
Gauge,
nominal (mil) |
- |
45-36 |
|
Plies
reinforcing (6.5 oz) 10 x 11 polyester blend scrim 2520d
x 2000d double rip stop |
- |
1-1 |
|
Grab
Tensile
(min.) (lb) |
ASTM
D751
Method A |
500
x 450 |
|
Strip
Tensile
(min.) (lb) |
ASTM
D1117
Procedure B |
400
x 300 |
|
Low
Temperature Flexibility
0.125 in. mandrel (°F) |
ASTM
D2136
4 hrs. |
30 |
|
Puncture
Resistance (min.) (lb) |
ASTM
D751
1" Ball |
600 |
|
Tongue
Tear (min.) (lb) |
ASTM
D751
Procedure B |
135
x 135 |
|
Trapezoid
Tear (min.) (lb) |
ASTM
D1117
Section 14 |
75
x 75 |
|
Hydrostatic
Resistance
(min.) (psi) |
ASTM
D751
Method A Procedure 1 |
600 |
|
Ply
Adhesion (min.) ( lb/in.) |
ASTM
D751
|
10 |
|
Dimensional
Stability (max.) (%) |
ASTM
D1204
1 hr@ 212°F |
2 |
TYPICAL
FACTORY SEAM PROPERTIES
|
Property |
Test
Method |
Value |
|
Bonded
Seam Strength (min.) (lb) |
|
270 |
|
Peel
Adhesion (min.) (lb) |
|
10
or FTB |