 |
 |
TEXFLEX®...Engineered for Zero Permeation
Permeation, the process by which a liquid or gas penetrates and travels through a material on a molecular level, is characterized by three steps: sorption of molecules into the contacted surface; diffusion of the sorbed molecules; and desorption of the molecules from the opposite surface. In older technologies, porous PTFE dip-coated fiberglass is often used as a starting point for the expansion joint membrane. The inclusion of the porous elements has proven to be a serious design flaw. Over time, these fabrics absorb flue gas condensates which speed the deterioration of the joint’s integrity.
The TEXFLEX zero permeation system totally encapsulates the high strength reinforcing ply. The reinforcement is free of flue gas and outside contamination, as illustrated below, that could cause deterioration and ultimate failure of the material
|
|
Many manufacturers include fluorelastomer (FKM) in the PTFE® Dip Coating Process leaving small holes. At higher temperatures FKM will react with, and ultimately destroy the Fiberglass Substrate. Additionally, ammonia, used in systems such as SCRs will deteriorate the FKM and cause premature expansion joint failure.
|
TEXFLEX 1400NP is used for a wide variety of expansion joint applications. For heavier duty installations, SJ2200NP is available. SJ2200NP has greater tensile strength, withstands higher pressure, and provides greater thickness.
PHYSICAL CHARACTERISTICS
| . |
TEXFLEX 1400NP
|
TEXFLEX SJ2200NP
|
| Maximum Continous Temperature |
575ºF
|
| Excursion Temperature |
650ºF on an intermittent basis
|
| Maximum Pressure |
±5 psi
|
±10 psi
|
| Chemical Resistance |
Excellent
|
| Permeation |
None from either side Test ASTM F-739-85
|
| Thickness |
0.055 in.
|
0.100 in.
|
| Weight |
69 oz/yd2
|
92 oz/yd2
|
| Tensile Strength |
1400 pli
|
2400 pli
|
| Shelf Life |
Unlimited
|
|
| . |
Elastometer (EPDM)
|
FKM® Fluoroelastomer
|
TEXFLEX Composites
|
| Material Temperature Minimum |
-60°
|
-40°
|
-110°
|
| Continuous |
300°
|
400°
|
575°
|
| Intermittent |
350°
|
550°
|
650°
|
| (Accumulative Time) |
200 hrs.
|
24 hrs.
|
75 hrs.
|
| Chemical Resistance* |
. |
| H2SO4 Acid Hot (+) over 50% Concentration |
B-C
|
A
|
A
|
| HCL Acid Hot (+) Over 20% Concentration |
C
|
A-B
|
A
|
| Anhydrous Ammonia |
A
|
C
|
A
|
| NAOH Over 20% Concentration |
A
|
B
|
A
|
|
|
*Rating Code:
|
A = Little or no effect |
|
B = Minor to moderate effect |
|
C = Severe effect |
|
 |
|
 |
