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C-14
WINNER
Chemical Processing'sVAALER AWARD
¦ Pure microcellular PTFE
¦ Similar to Style 3545, but without rigid core
¦ Ideal for wavy, warped, pitted, or scratched
flanges, and for many types of flat face* flanges
Test Results
DIN 3535 Gasket Permeation Test
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
cc/min. Leak Rate
Expanded GYLON® GYLON®
PTFE 3540 3545
DIN 52913 Gasket Bolt Load vs. Time
Note the dramatically reduced leakage of GYLON® 3540 and 3545.
Average of three tests, using 580 psig nitrogen with 4,640 psi gasket load
according to DIN 3535 requirements. All samples 1/16" (1.6 mm) thick.
7500
(53.5)
6000
(42)
4500
(31.5)
3000
(21)
1500
(10.5)
0
Bolt Load Retained – psi (bar)
High bolt load retention of GYLON® 3540 and 3545, especially at high tem-
peratures, indicates gasket is less likely to incur gross leakage (blowout).
GYLON® Style 3545
Tighter seal
¦ Highly compressible PTFE outer layers seal under low
bolt load—suitable for many flat face and glass-lined
flanges*
¦ Compressible layers conform to surface irregularities,
especially on warped, pitted or scratched flanges
¦ Rigid PTFE core reduces cold flow and creep normally
associated with conventional PTFE gaskets
Excellent chemical compatibility
¦ Pure PTFE withstands a wide range of chemicals
Easy to cut and install
¦ Soft PTFE can be cut easily from larger sheets, reduc-
ing inventory costs and expensive downtime
¦ Rigid PTFE core facilitates installation, especially on
large diameter flanges and hard-to-reach areas
Benefits
Configuration
Cross-sectional view under electron microscope
All layers manufactured using proprietary GYLON®
process—thermally fused layers, without the use of
adhesives
Microcellular
PTFE
Rigid PTFE
Microcellular
PTFE
Media
GYLON® 3540: Strong caustics, strong acids, hydro-
carbons, chlorine, cryogenics, and
glass-lined equipment. Conforms
to FDA regulations.
GYLON® 3545: Strong caustics, strong acids, hydro-
carbons, chlorine and cryogenics.
Conforms to FDA regulations.
GYLON® 3540
GYLON® 3545
Expanded PTFE
Skived PTFE
0 2 4 6 8 10 12 14 16
Hours at 500°F (260°C)
* For flat face flanges, a minimum compressive stress of 1,500 psi (103
N/mm 2) is recommended on the contacted gasket area for 150 psig
(10.3 N/mm2) liquid service. Consult with the flange manufacturer to
confirm that adequate compressive stress is available.
GYLON® Style 3540