Gylon® 3504
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Gaskets & Sheet Jointings

Gylon® 3504

Gylon® 3504 is a highly compressible grade of Gylon®, comprising PTFE with a filler of glass microspheres. It is blue in colour.

Garlock Sealing Technologies' unique Gylon® manufacturing process retains all the positive characteristics of PTFE, but minimises or eliminates the creep and flow problems associated with conventional PTFE products.

Typical applications 
This highly-compressible modified-PTFE material is designed for applications where efficient flange sealing is required at low bolt loads. It is recommended for use with glass-lined, enamelled or plastic flanges in the chemical, pharmaceutical, food orocessing, and electronics sectors.

Prime features

  • Resists a wide range of chemicals.
  • Highly compressible with excellent bolt-load retention.
  • Improved performance over conventional PTFE.
  • Outstanding dimensional stability.
  • Resists wear and abrasion.


  • Conforms to FDA requirements.
  • Meets USP requirements.
  • Meets food contact to EC Regulation 1935-2004.
  • Conforms to ABS (American Bureau of Shipping) requirements.
  • TUV certified in accordance with TA-Luft/VDI 2440.
  • ASTM F104 Line call out: F456999A9B7E99K3M6.

Chemical properties

  • Resistant to moderate concentrations of acids, some caustics, solvents, hydrocarbons, hydrogen peroxide, refrigerants, and cryogenics.
  • Will not burn.

Biological properties

  • Will not support bacterial growth.

Physical properties
Density, Mg/m³: 1.70 (ASTM D792)
Transverse tensile strength, MPa:  13.8 (ASTM F152)
Modulus at 100% elongation, MPa:  10.3  (ASTM D1708) 
Compressibility, %:  25-45  (ASTM F36)
Recovery, %:  30  (ASTM F36)
Gas permeability, ml/min: <0.015  (DIN 3535-4)

Operating limits
Temperature range (continuous operation):  -268°C to +260°C
Maximum working pressure:  5.5MPa/55bar.

How supplied
Precision cut gaskets to any shape, size or quantity. Also in sheet form to maximium size 1.5m x 1.5m. Thicknesses: 0.8mm, 1.0mm, 1.6mm, 2.0mm. Please note that 3.2mm is also available, but is not recommended.

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