Garlock GYLON 3505 (Blue Sheet)

Garlock GYLON 3505 PTFE Gasketing with Aluminosilicate Microspheres.

A high performance gasket sheet of  PTFE with aluminosilicate microspheres that is NSF 61 approved and is ideal for Oxygen Service Applications. 

Garlock GYLON® gasketing is a family of flat PTFE gasketing materials. GYLON® high-performance PTFE gasketing is manufactured using a proprietary process that imparts unique physical properties, which are not obtainable through conventional manufacturing methods: Designed for severe chemical service, color-coded for easy identification, superior sealability, which helps reduce process and media loss as well as fugitive emissions, reduced creep and cold flow characteristics, and patented thermal bonding process to fabricate virtually any size gasket. The innovative GYLON® gasketing process reorients the PTFE and fillers in such a way to increase the material’s tensile properties and decrease the creep relaxation problems that usually plague PTFE products. In addition, the mixing process creates a homogenous material with consistent, superior physical properties that, unlike inexpensive skived PTFE sheet materials, do not fluctuate from one side of the sheet to another. 


  • 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
  • Excellent bolt torque retention
  • Chemical resistance - Withstands a wide range of chemicals for extended service life in a wide variety of applications
  • Cost savings - Cuts operational costs through reduced:- Fluid loss- Energy consumption- Maintenance costs- Inventory costs- Waste

Compatible With:

  • Potable drinking water
  • Hydrocarbons
  • Solvents
  • Moderate concentrations of acids and some caustics
  • Refrigerants
  • Cryogenics, hydrogen peroxide


Garlock GYLON 3505 Gasket Sheets are available in these sizes:

1/16” X 60” X 60”

1/8”   X 60” X 60”

Note: Other thicknesses and sheet sizes may be available by special order.



Min. Temp

-450° F

Max Temp

 500° F

Max Pressure

800 PSI

Max PXT 1/16”

350,000 (°F X PSIG)

Max PXT 1/8”

250,000 (°F X PSIG)

ASTM F104 Line Call Out: 




Garlock 3505 Resource Page


1335 West 11th Street, Long Beach, CA 90813-2714

Phone: 562-435-2411 | Fax: 562-436-2140

Open to the Public Monday - Friday 8 am - 5 pm