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Garlock Gylon® 3500 Gasketing Material

Fawn PTFE with silica filler

Gylon 3500 Sheet Gasket Material


Garlock Gylon® 3500 is truly a superior and unique material. The exclusive properties of Gylon® are combined to deliver its superior performance to comply with today's clean air requirements through sealability and torque retention. Asbestos-free Gylon® gasket materials routinely out-performs all conventional PTFE products by drastically minimizing gasket creep and cold flow problems.


Garlock Gylon® 3500 is premium grade compressed sheet gasket material that is excellent in strong acids except hydrofluoric, solvents, hydrocarbons, water, steam, chlorine, and cryogenics, Conforms to FDA regulations. For oxygen service, specify "Style 3502 for oxygen service."

Tighter Seal

Improved performance over conventional PTFE. Reduced product loss and emissions.

Reduced creep relaxation

Unique manufacturing process minimizes cold flow problems typical of skived and expanded PTFE sheets.

Reduced creep relaxation

Unique manufacturing process minimizes cold flow problems typical of skived and expanded PTFE sheets.

Chemical resistance

Withstands a wide range of chemical for extended service life in a wide variety of applications.

Cost savings

Cuts operational cost through reduced Fluid Loss, Energy Comsuption, Maintenance Costs, Inventory Costs and Waste.

Largest Sheet Sizes*

Offers some of the largest sheet sizes in the industry. Improved material utilization reduces waste.

Branding and color coding

Easy identification of superior GYLON products. Reduces misapplication and use of unauthorized, inferior substitutes.

Typical Properties

Thickness 1/16"
Color: Fawn with Blue Brand
Fiber: PTFE with silica
Fluid Service: Strong acids (except hydrofluoric), steam, solvents, hydrocarbons, chlorine and cryogenics

-450°F (-268°C)
500°F (260°C)
Pressure: max, bar (psi) 83 (1,200)
Compressibility, ASTM F36: 7 to 12%
Recovery ASTM F36: 40%
Creep Relaxation ASTM F38: 18%
Tensile ASTM D1708:
Across Grain, psi (N/mm2)

2000 (13.8)
Specific Gravity ASTM 792: 2.10
Modulus @100% Elongation:
psi (N/mm2)

1600 (11.0)
Thermal Conductivity(K):
W/m°K (Btu. -in./hr. -ft.2 -°F)

0.36 - 0.45 (2.50 - 3.15)
Gasket Load: psi (N/mm2)
ASTM F37B - Fuel A
DIN 3535 - Nitrogen

1000 (7)
4646 (32)
Internal Pressure: psi (bar)
ASTM F37B - Fuel A
DIN 3535 - Nitrogen

9.8 (0.7)
580 (40)
ASTM F37B - Fuel A
DIN 3535 - Nitrogen

0.22 ml/hr.
0.015 cc/min
Flammability: Will Not Support Flame
Bacterial Growth: Will Not Support
Meets Specifications: ABS (American Bureau of Shipping), FDA (Food and Drug Administration) and USDA (US Department of Agriculture)

Note: ASTM properties based on 1/16" sheet thickness except ASTM F38, which is based on 1/32" sheet thickness. This is a general guide only and should not be the sole means of accepting or rejecting this material. The data listed here falls within the normal range of product properties but should not be used to establish specification limits nor used alone as the basis of design.

*For applications above Class 300, consult your representative.

Dielectric Properties, range, volts/mil.

Thickness 1/16" 1/8"
3 hours at 250°F 362
96 hours at 100% Relative Humidity 61

P x T (max.)1

Thickness 1/16" 1/8"
psig x °F (bar x °C) 350,000 (12000) 250,000 (8600)

Proposed ASTM F586 Gasket Constants

Thickness 1/16" 1/8"
M 5.0 5
Y 2750 (19.0) 3500 (24.1)
Gasket Constants
Gb psi 949 1980
a 0.253 0.169
Gs psi 2.6 0.393
*Gasket Constants based on proposed ASTM Draft 10.01

Available Sheet Sizes

Nominal Thickness Sheet Sizes Order Code Weight / Sheet lbs (kg)
1.64" (0.4 mm) 60 x 60 1524 x 1600 35014-6601 4.7
1/32" (0.8 mm) 60 x 60 1524 x 1600 35014-6602 9.4
1/16" (1.5 mm) 60 x 60
60 x 90
70 x 70
1524 x 1524
1524 x 2286
1778 x 1778
1/8" (3.0 mm) 60 x 60
60 x 90
70 x 70
1524 x 1524
1524 x 2286
1778 x 1778
1/4"(6.0 mm) 60 x 60 1524 x 1524 35014-6616 75

Note: 1mm thickness or, 60" x 120" (1.5m x 3m) sheet sizes available on special order, other custom lengths available on request

Warning: Durlon gasket materials should never be recommended when both the temperature and the pressure are at the maximums listed. Properties and applications shown are typical. No application should be undertaken by anyone without independent study and evaluation for suitability. Never use more than one gasket in one flange joint, and never reuse a gasket. Improper use or gasket selection could cause property damage and/or serious personal injury. The data reported is a compilation of field testing, field service reports and/or in-house testing. While the utmost care has gone into publishing the information contained herein, we assume no responsibility for errors. The information and specifications contained in this website are subject to change without notice. This revision cancels and obsoletes all previous editions.

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