This document provides information on GYLON gasketing materials produced by Garlock. It discusses Garlock's history and global operations. Several types and properties of GYLON gaskets are described, including styles for various temperature ranges and pressures. End uses, approvals, sizing, and installation recommendations are also covered at a high level.

1. GYLON Gasketing
GGaarrlloocckk
DIN EN ISO 14001:2004
Zertifikat: 01104 031904

2. Garlock – Over 110 Years of Competence
Garlock Sealing Technologies is one of the
leading sources world-wide for demanding
sealing technology with over 100 years of
experience.
Production and sales locations in all important
industrial nations form the foundations for the
economical ”one-stop-shopping“ approach, so
important to international customers today.
Garlock Sealing Technologies offer quality
and delivery related guarantees world-wide
for all products. Regional Garlock consultants
are available to discuss application-specific
issues.
For the European Market, the company
Garlock GmbH, Neuss, Germany provides
stocking, co-ordination and consulting services.
Ready-to-use gaskets are manufactured here
according to the customers specifications using
most modern waterjet cutters.
A service which saves the customer time and
money.
The world-wide successful GYLON gaskets are
being exclusively manufactured by Garlock.
Their excellent properties – above all the com-
bination of the advantages offered by PTFE
combined with superior creep characteristics.
Individual, competent and experi-
enced
The Garlock consultants give you the
reliability you need. Through compe-
tent recommendations which take in-
to account the specific requirements
of your company. Through the expe-
rience and the personal commitment
to come up with the best solution to
your sealing problem economically
and engineering wise.
We will be pleased to inform you
about your nearest Garlock consultant.
ISO 9000
Garlock Sealing Technologies is certi-
fied at all its manufacturing locations
in accordance with ISO.
2

3. The benefits of using GYLON
GYLON combines many excellent
properties:
• Excellent chemical resistance
• Resistant to cold flow
• Usable at high pressure-temperature
combinations
• High recovery
• Temperature stability from -212 °C
to +260 °C
• Excellent dimensional stability
under thermal stress
• Good electrical insulation
• Extremely resistant to wear and
abrasion as well as adverse
weather conditons
50
40
30
20
10
N/mm2
Hours
0 10 20 30 40 50 60 70 80 90 100
100 °C
175 °C
200 °C
250 °C
Before
After
GYLON-Standard GYLON-Blue GYLON-Off-White conventional PTFE
A comparison of GYLON gasketing and conventional PTFE when compressed at 14 N/mm2
for 1 hour at a temperature of 260 °C.
Creep tests according to DIN 52913.
GYLON-Standard: 55 x 75 x 2 mm; initial compressive stress of 50 N/mm2
.
3

4. GYLON – proved and successful
4
GYLON Style 3500 and 3501 E Standard
Multi-purpose gaskets for the chemical and petrochemical
industries. Offers significant advantages over conventional
PTFE in higher pressure-temperature applications due to
excellent cold flow resistance.
GYLON Style 3504 Blue
Due to its inorganic microspheres, GYLON Blue is highly
compressible. This excellent gasketing material is espec-
ially suited to glass lined, enamelled and plastic flanges
as well as other applications sensitive to bolt load.
GYLON Standard, Blue and Off-White now TÜV
Certified: Quality Tested in high quality in accordance
with German Clean Air Regulations (“TA-Luft”)
A comprehensive test programme was run by the TÜV
Süddeutschland covering the following aspects:
• Low leak rate of the seal under maximum operating
conditions. Proof of a leak rate
≤ 1,0 x 10-4
mbar x ltr /(s x m) acc. to TA-Luft 2002.
• Checks on how assembly and maintenance is controlled
so as to ensure proper operation.
• Confirming leaktightness of the materials also in
endurance tests.
• Proof of adequately high mechanical properties for
corresponding temperatures.
• Test on safety against bursting and blow-out (2.5 x PN).
• Proof of a controlled and consistently high quality pro-
duction output by the manufacturer.
The analysis by the TÜV Süddeutschland on the GYLON
material for flat gaskets has yielded the results sum-
marised in the table above and it has been determined
that GYLON is, for the stated operating parameters and
when used in connection with flat flanges according to
DIN 2635 Form C, of high quality in accordance with the
testing programme of the Institute for Plastics in the sense
of “TA-Luft” (Clean Air Regulations).
Gasket type
GYLON Standard
Style 3501 E
30
20
30
from RT up to 250
from RT up to 250
from RT up to 250
40
40
25
GYLON Blue
Style 3504
GYLON Off-White
Style 3510
jVU
(N/mm2
)
Operating
temperature
(°C)
Operating
pressure
(bar)

5. GYLON – proved and successful
5
GYLON Style 3510 Off-White
Of all types within the GYLON family,
GYLON Off-White is the most resis-
tant to chemical attack. It is therefore
especially well-suited for aggressive
media like hydrofluoric acid, caustic
potash solution, aluminium fluoride
and electrolytic baths.
GYLON Style 3545
GYLON Style 3545 consists of a highly compressible outer layer of microcel-
lular PTFE and a rigid PTFE core (which reduces the cold flow and creep). The
two layers have been sintered together homogenously. These materials are
made of pure PTFE without any fillers. Style 3545 has a very soft surface
which is particularly suited to flanges with uneven surfaces and where low
bolt loads are required.
GYLON HP 3560
The combination of GYLON Standard with the advantages of creep resis-
tance, universal resistance to chemical attack and the integrated stainless
steel sheet, result in the best sealing properties and the utmost reliability.
GYLON HP 3560 was developed for chemical applications involving aggres-
sive media where safety against a blow-out is paramount, for example in the
case of pressure bursts. One application among many is in the pulp & paper
industry in connection with boiling apparatus where the gaskets are exposed
to pressure bursts at high pressures.

6. Custom-made Gaskets
6
GYLON Endless Gaskets
Especially for cases where the required dimensions exceed those of our stock
gasket sheet, Garlock is capable of manufacturing endless gaskets using a
special welding method. The welded gaskets offer the same homogeneity
and sealing properties compared to the endless gaskets.
Large Gaskets in Segments
For economical reasons and in the case of less demanding requirements,
large flange gaskets consisting of several segments may be employed. The
ends of these segments are either button-holed or duck-tailed. At Garlock
such segment links can be produced using water cutting technology with
attendant manufacturing accuracy, very close fitting joints and leakage
properties hardly any inferior to those of the endless gaskets.
High-Pressure Water Cutting Technology
With water cutting machines it is possible to manufacture gaskets of any
shape and size which offer the following advantages: high dimensional accu-
racy, fast production of the desired shape of gasket without the need for
expensive cutting tools, single gaskets and small batches can be delivered
quickly and economically. The cutting tool used in this technology is a water
jet about 0.3 mm thick which impacts on the gasket material at a pressure of
up to 4000 bar and three times the speed of sound.
GYLON Gasket with stainless steel metallic insert
Dimensions in accordance with DIN EN 1514-1. GYLON gaskets with metallic
insert comply with the UVV ”Gases“ regulations (VGB611 of the employer‘s
liability insurance association for the chemical industry as well as the AD
rulings B7 (Vd TÜV)). This means that even in the case of toxic and easily
flammable media, flanges need not be of the tongue and groove type.

7. GYLON – Approvals and Installation Recommendations
7
Approvals for GYLON
For special applications and requirements the materials
used for our gaskets have been subjected to special
tests. Detailed information on the tests outlined in the
following is available upon request.
Use in connection with gaseous and liquid oxygen
BAM approval for GYLON Style 3501 E, Style 3510
and Style 3504.
TÜV-Certification
GYLON Style 3501 E, Style 3504 and Style 3510 are TÜV
certified: high quality in accordance with German Clean
Air Regulations (”TA-Luft“).
FDA
GYLON Standard, Blue and Off-White conforms to FDA
specifications.
Approvals for chlorine
GYLON Style 3500 and 3510 are recommended by the
Chlorine Institute Washington/USA for sealing of liquid
and gaseous chlorine.
US Department of Agriculture
The US Department of Agriculture has accepted GYLON
Style 3500 for all those cases where GYLON comes into
direct contact with meat or poultry.
Installation Recommendations for
GYLON Gaskets
Only a few factors need to be con-
sidered when fitting gaskets in order
to ensure proper functioning of the
gasket.
• The gasket must be placed correctly
central on the sealing surface.
• The sealing surface must be clean,
level and undamaged.
• The surfaces of the gasket and the
flanges must not be treated with
grease or separating agents.
• The bolts of the flange must be
tightened according to the diagram.
During the first tightening round,
the bolts must be tight-ened to 50%
of the final torque. During the
second round to 80% and the third
round to 100%. In order to ensure a
perfect seal for the flange connec-
tion, the bolts should be checked
and re-tightened as appropriate
after 12 to 24 hours.
• Review basic suitability of the gas-
ket used with respect to the entire
thermalmechanical and chemical
stresses during operation (tempera-
ture, pressure, medium etc.) and
also in consideration of the condi-
tions for which the flange connec-
tion has been designed.
• Check the dimensions of the gasket
(inside and outside diameter, thick-
ness) in consideration of the condi-
tions for which the flange connec-
tion has been designed or the
applicable flange and sealing
standards (nominal width, nominal
pressure).
• Check the strength potential or the
torque data of the bolts with respect
to attaining the minimum force per
surface area required for the spe-
cific gaskets, which is above all
affected by the operating medium,
its state of aggregation, the oper-
ating pressure, the permissible leak
rate and the safety level of the
system.
• Avoid exceeding the maximum
force per surface area specified for
the specific gaskets which is above
all influenced by the operating tem-
perature and the ratio between
width of the gasket and thickness
of the gasket.

8. 8
The specifications stated here have
been determined in the lab in accor-
dance with DIN or ASTM guidelines.
In practice, deviations may be expe-
rienced owing to differing operating
conditions.
* BAM approval for oxygen service
at 200 °C and 25 bar.
** Operating temperature and pres-
sure loads, the maximum of which
may not be reached at the same
time. The P x T factor (pressure-tem-
perature factor) allows checking of
the actual operating data as to the
suitability of GYLON gaskets.
The value obtained by multiplying the
max. operating temperature (°C) and
the max. operating pressure (bar)
must not exceed the value specified
for P x T max. Any pressure and tem-
perature combination which remains
below P x T max. is permissible.
GYLON Availability
GYLON Standard, Blue,
Off-White Gaskets
Sheet-thickness with tolerances (mm):
0,4 (+0,13/-0,05) · 0,8 (±0,13) ·
1,0 (±0,13) · 1,6 (±0,15) · 2,0 (±0,15) ·
3,0 (±0,25) · 3,2 (±0,25) ·
4,8 (±0,40) · 6,4 (±0,50)
Sheet-sizes (mm):
1500 x 1500 · 1500 x 2280 ·
1780 x 1780
GYLON HP 3560
1,6 mm thick with perforated stainless
steel inserts
3,2 mm thick with two perforated
stainless steel inserts
Sheet size: 600 x 600 mm
GYLON Style 3545
Thickness: 2,0, 3,0, 4,8 or 6,4 mm
Sheet size: 1500 x 1500 mm
GYLON gaskets are offered as
sheets or as ready-to-use gaskets.
Production capabilities to customer
specifications or as flange seal in
accordance with all common stan-
dards.
Technical Information
Temperature range
Pressure load
P x T, max.** thickness
1 and 1,5 mm
3,0 mm
Compressive creep strength (DIN 52913)
150 °C - 30 N/mm2
175 °C - 50 N/mm2
Compressibility (ASTM F 36)
Recovery (ASTM F 36)
Creep relaxation (ASTM F 38)
Tensile strength (ASTM D 1708)
Sealability (ASTM F 37 B) ASTM Fuel A:
Internal pressure = 0,7 bar, Gasket load = 7 N/mm2
Gas sealability (DIN 3535/6)
Leak rate (DIN 28090-2), λ2,0
Density (DIN 28090-2)
GYLON Standard
Style 3501 E*
-210 to +260 °C
83 bar
12000
8600
16
25
7-12%
40%
18%
14 N/mm2
0,1 ml/h
0,10 cm3
/min
< 0,001 mg/(s x m)
2,19 g/cm3
GYLON Standard
Style 3500
-210 to +260 °C
83 bar
12000
8600
16
25
7-12%
40%
18%
14 N/mm2
0,22 ml/h
0,25 cm3
/min
< 0,001 mg/(s x m)
2,10 g/cm3
GYLON Blue
Style 3504
-210 to +260 °C
55 bar
12000
8600
15
–
25-45%
30%
40%
14 N/mm2
0,12 ml/h
0,15 cm3
/min
< 0,001 mg/(s x m)
1,70 g/cm3
GYLON Off-White
Style 3510
-210 to +260 °C
83 bar
12000
8600
14
–
4-10%
40%
11%
14 N/mm2
0,04 ml/h
0,10 cm3
/min
< 0,001 mg/(s x m)
2,80 g/cm3
GYLON
Style 3545
-210 to +260 °C
83 bar
12000
8600
14
–
60-70%
15%
15%
–
0,15 ml/h
0,04 cm3
/min
< 0,002 mg/(s x m)
–
GYLON
Style HP 3560
-210 to +260 °C
172 bar
25000
15000
–
–
4-9%
45%
20%
34 N/mm2
0,02 ml/h
0,02 cm3
/min
–
–

9. Technical Information
9
All information and recommenda-
tions provided in this catalogue is
based on many years of experience.
Unknown factors may result in some
restrictions. Binding statements as to
the compatibility of our products are
thus only possible after conducting
practical experiments under the
operating conditions encountered in
the customer’s system. Therefore, the
data provided in our catalogues are
a general guide only.
Gasketing characteristic according to the
„Sheet of Instruction B7“
Gasketing characteristic values according to DIN 28090 for the quality assurance and calculation of flanged connections
The values jVU are for gas and steam application.
For fluids lower values can be used (~ 20%).
kO x KD-values for fluid can be used 20% lower.
bD = effective gasket width.
The contact surface finish should be in-between Rt = 50-160 μm
Gasketing characteristic according to
DIN E 2505 – Part 2
Maximum initial
compressive stress jV0
DIN 28090-1 N/mm2
Maximum in-service
compressive stress jB0/200 °C
N/mm2
Minimum
initial stress jVU/L0,1-40 bar
DIN 28090-1 N/mm2
Compression modulus at room temperature ␧KSW DIN 28090-2 %
Percentage creep relaxation at room temperature ␧KRW DIN 28090-2 %
Compression modulus at elevated temperature ␧WSW DIN 28090-2 %
Percentage creep relaxation at elevated temperature ␧WRW DIN 28090-2 %
GYLON Standard
Style 3500
Style 3501 E
160
100
20
3,1
1,1
12
2,5
GYLON Off-White
Style 3510
150
70
19
4,1
1,3
29
4,2
GYLON Blue
Style 3504
150
70
10
20
6,1
32
5,7
GYLON
Style 3545
140
70
17
–
–
–
–
GYLON Standard
Style 3500
Style 3501 E
GYLON Off-White
Style 3510
GYLON Blue
Style 3504
Thickness
hD
mm
1,0-3,2
1,0-3,2
1,0-3,2
Gasket-type
Installation
Condition
jVU jVO
N/mm2
N/mm2
18 160
15 150
8 150
Operating Condition
°C
20 100 200
jBO; N/mm2
160 120 100
150 85 70
150 85 70
bD
/hD
≥10Remarks
Temperature
°C
20
20-250
20
20-250
20
20-250
kO x KD
N/mm
18 x bD
10 x bD
15 x bD
10 x bD
8 x bD
6 x bD
k1
mm
1,3 x bD
1,3 x bD
1,1 x bD
1,1 x bD
1,1 x bD
1,1 x bD

10. GYLON Testing Report
10
The information given on the following pages
should put the user in a position to prove qua-
litatively, in discussions with the relevant safety
authority, e. g. TÜV for example, the quality of
the gaskets used. The diagrams provided in
the following summarise the results obtained
from a series of experiments using the material
GYLON Standard.
Given in the first diagram are the leak rates which are
to be expected as a function of surface pressure. These
tests were performed with nitrogen at an internal pres-
sure of 40 bar. The straight line of the characteristic was
created from points which were determined under both
load and no-load conditions. The surface pressure
required to attain a flange connection which is leak tight
in accordance with the TA Air - (101
μg/s x m corresp.
0.01mg/s x m) - equivalent to 17 MPa or 17 N/mm2
. Since
the samples were tested in an assembly which is resistent
to bending, one is on the safe side when using the mate-
rial in flange connections. All leak data were determined
at a constant leak rate.
Presented in the second diagram is the determination of
jBU at 200 °C under the test conditions already detailed.
In order to determine jBU at 200 °C, a maximum leak
rate was fixed, the value of which was one order of
magnitude below the value specified by TA-Air. In the
case of a flange connection, the surface pressure may
drop for various reasons at certain points or along the
entire circumference (often because of flexing, running
out of true, incorrect assembly among others). The value
of jBU at 200 °C represents a quantity which states how
low the surface pressure may get at a temperature of
200 °C and an internal pressure of 40 bar using nitrogen
so as to maintain the required degree of leak tightness.

11. GYLON Testing Report
11
In the face of strong compressive stress various PTFE
based materials have the tendency to change significantly;
they may for example creep strongly and suddenly,
break or fail in other ways. As depicted in the third dia-
gram, the material GYLON Standard subjected to the
tests does not change in its physical and structural pro-
perties even when exposed to a high compressive stress
of 135 N/mm2
. The leak rates were in this case deter-
mined at an internal pressure of 60 bar using nitrogen.
When stressing the gasket, 3 leak rates were determined,
specifically at 5 N/mm2
, 65 N/mm2
and 135 N/mm2
.
Thereafter the stress on the sealing material was relieved
step by step at first to 65 and then 5 N/mm2
, whereby
again the leak rates were determined. In the case of
such high surface pressures, the GYLON Standard gas-
kets showed no sign of physical change or mechanical
failure. Even when relieved to 5 N/mm2
, the leak rate
remained below the value demanded by TA-Air.
Characteristic for this investigation and the GYLON
Standard gaskets is the unimpaired recovery capability
even after exposure to high surface pressures.
Shown in diagram 4 is the course of the recovery as a
function of the applied surface pressure exerted on the
gasketing material. The course of this curve is quite un-
typical for PTFE and clearly demonstrates that GYLON
gaskets are capable of sustaining a surface pressure of
140 N/mm2
without being damaged. Moreover, it is pos-
sible to derive from this curve that it is one of the primary
characteristics of the GYLON gaskets that their recovery
increases at increasing compressive stress.
Diagram 5 shows the results of a long term test on
GYLON Standard. This test was run for over 940 hours
at 200 °C. The leak rate remained below 0.1μg/s x m.
These investigations which were performed by the
Federal Material Research Laboratory provide the
user sound reasons for using the gaskets in accor-
dance with TA-Air and in line with accident preven-
tion regulations thereby forming a solid base of data
for checking the flange connection.

12. Technicaldetailssubjecttochangewithoutnotice.GP-GB4·1·12/05
Hydraulic Components
Oil Seals
Compression Packings
Gasketing Products
Metallic Gasketing
Inflatable Seals
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Valves
Other Garlock facilities: Garlock Inc., N.Y., U.S.A. • Garlock of Canada Ltd. • Garlock de Mexico • Garlock Pty. Ltd., Australia • Pacific Rim Operations, Singapore
Garlock Middle East
P.O. Box 1518
Oilfield Supply Centre
Jebel Ali Free Zone
Dubai U.A.E
Phone: +971-4/8833652
Fax: +971-4/8833682
E-mail: garlock@emirates.net.ae
http://www.garlock.eu.com
Garlock (GB) Limited
Unit H5, Premier Way
Lowfield Business Park
Elland,
West Yorkshire, HX5 9HF
United Kingdom
Phone: +44-1422/313600
Fax: +44-1422/313601
E-mail: enquiries@garlockgb.co.uk
http://www.garlock.eu.com
Garlock GmbH
Falkenweg 1
41468 Neuss
Germany
Phone: +49-2131/349-0
Fax: +49-2131/349-222
E-mail: garlockgmbh@garlock.com
http://www.garlock.eu.com
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90, Rue de la Roche du Geai
42029 Saint-Etienne
France
Phone: +33-4/77435100
Fax: +33-4/77435151
E-mail: garlockfrance@garlock.com
http://www.garlock.eu.com
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