Gylon ® 3504

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Style 3504 - Blue
PTFE with glass microspheres

ASTM F104: F456999A9B7E99K3M6

Garlock GYLON ® 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-perform all conventional PTFE products by drastically minimizing gasket creep and cold flow problems.

GARLOCK® 3504 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

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.


Available Sheet Sizes:

Nominal Thickness
Sheets Sizes
Order Code
Sheets per Roll
Weight / Sheet lbs (kg)
Inches mm
1/32" (0.8 mm) 40 x 40 1016 x 1016 35120-4402   3.2
1/16" (1.5mm) 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 35120-6616   57.8

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.


M&Y and Proposed ASTM Gasket Constants:

Thickness 1/16"
 M  3.0 2.8
Y psi (MPa)  1650  3000
Gasket Constants    
Gb psi (MPa) 183 1008
a 0.357 0.221
Gs psi (MPa) 4.01E-03 2.23E+00

*Gasket Constants based on proposed ASTM Draft 10.01


Typical Properties:

Color: Blue with Blue Brand
Fluid Service: Moderate concentrations of acids and caustics, hydrocarbons, solvents, water, refrigerants, cryogenics, hydrogen peroxide
Temperature: min. -450°F (-218°C) to max. +500°F (+260° C)†
Pressure, max: 800 psig (55 bar)
P x T, max: 350,000 (12,000)* (1/32" and 1/16")
250,000 (8,600)* (1/8")
Note: This general purpose GYLON ® gasket material has a significant advantage over conventional PTFE in regard to its functionability at higher temperature/ pressure combinations. Often used in chemical processing and hydrocarbon processing industries. Conforms to FDA regulations.
Note: When Fawn GYLON ® gasket material is required for oxygen service, specify “Style 3502 for oxygen service.”
† when approaching maximum temperature, consult your sales representative
* P x T max. = psi x °F (BAR x °C)


Physical Properties:

ASTM Test Physical Properties 3500 (Fawn) 3504 (Blue)
3510 (Off White)
F37B Sealability
Milliliters/hr. leakage
ASTM Fuel A (isooctane)
Gasket Load: 1000 psi (7 N/mm2)
Internal Pressure: 9.8 psi (.7 BAR)
0.22 0.12 0.04
F38 Creep Relaxation, % 18 40 11
F36 Compressibility, Range, % 7-12 25-45 4-10
F36 Recovery, % 40 30 40
D1708 Tensile Strength, psi (N/mm2) 2000 (14) 2000 (14) 2000 (14)
D1708 Modulus at 100% elongation, psi (N/mm2) 1600 (11) 1500 (10) 1400 (9)
D792 Specific Gravity 2.10 1.70 2.80
D149 Dielectric Strength, V/Mil 500 305 577
F433 Thermal Conductivity (k),
Btu. in. / hr. ft.2 °F
2.88 1.44 2.40
Flammability:   Will Not Burn Will Not Burn Will Not Burn
Bacterial Growth:   Will Not Support Will Not Support Will Not Support