Document Type : Research Article


Department of Mechanical Engineering, Ecole de Technologie Superieure, 1100 Notre-Dame O, Montreal, H3C 1K3, Canada


Characterization of Teflon polymer based gaskets under expedited aging is the objective of this work. Teflon gaskets are exploited frequently as a replacement to asbestos fiber gaskets because of their excellent leak tightness and nonhazardous physical degradation properties. The research focuses profoundly on the adverse influence of temperature and thermal cycles on the creep and cumulative damage phenomenon under compressive load. Virgin and expanded PolyTetraFluoroEthylene (PTFE) are tested under 28 and 41 MPa of gasket stress at different temperatures. Intricate analysis of creep under coalesces of thermal ratcheting and principal stress is achieved through Universal Gasket Rig (UGR). The instigated cumulative damage is distinguishable into upper and lower bound temperature region indicating the escalation and decrease of thickness change during cycling which saturates after 12 thermal cycles for expanded PTFE while no saturation is reached for virgin PTFE in even after 20 thermal cycles. Percentage of thickness reduction at different applied stress is nearly the same for virgin PTFE whereas expanded PTFE shows largest reduction under lower stress. Compressive creep bespeaks the impact of temperature and load, thereby dictating the magnitude of ratcheting damage and contrariwise. Finally, the creep and thermal ratcheting has a proliferating effect on value of the coefficient of thermal expansion for all chosen gaskets. Copyright © 2017 VBRI Press.


1.Keywood, S., Testing and Evaluation of PTFE-Based Gaskets for
Chemical Plant Service, 5thAnnual Technical Symposium of the
Fluid Sealing Association, Fort Lauderdale, FL. 1994.

2.Winter, J.R., and Keywood S., Investigation of Extrusion-Type
Gasket failures of PTFE-Based Gaskets in Pipe-Line Flanges,
ASME Pressure Vessel and Piping Division, Application and
Methodology, Montreal, CA Vol. 326, 1996.

3.Derenne, M., Marchand, L., and Payne, J.R.,
Polytetrafluoroethylene (PFTE) Gasket Qualification, Welding
Research Council Bulletin, New York, Vol. 442, 1999.

4.Payne, J.R., and Bazergui, A., Evaluation of Test Method for
Asbestos Replacement Gasket Materials, MTI Publications No. 36,
Materials Technology Institute of the Chemical Process Industries,
St. Louis, MO, 1990.

5.Payne, J.R., Derenne, M., and Bazergui, A., A device for screening
gasket material at elevated temperature, Proceeding of 11thFluid
Sealing Conference, Science Publications, Cannes, France, 1987.

6.Bouzid, A., Derenne, M., Marchand, L., and Payne, J.R., J. Test.
Eval., 2001, 29, 442.


7.Bouzid, A., Derenne, M., Marchand, L., and Payne, J.R.,
Preventing PTFE Gasket Blow-Out, 9thInternational Conference
on Pressure Vessel Technology ICPVT-9, Sydney, Australia, Vol.
2, 2000.
8.Bouzid, A-H., and Benabdallah, S., J. Pressure Vessel Technol.,
2015, 137, 031012-1.


9.Bouzid, A., ASTM F03 Research Project on Thermal Expansion
Coefficient of PTFEGasketing Material Under High Loads,
ASTM International, Report No. F03-1039-CPMS, p. 39, 2011.

10.Marchand, L., Derenne, M., and Bazergui, A., J. Pressure Vessel
Technol., 1992, 114, 1.

11.ASTM E 228-11, Standard Test Method for Linear Thermal
Expansion of Solid Materials With a Push-Rod Dilatometer, West
Conshohocken, PA, 2016.

12.ASTM E 831-14, Standard Test Method for Linear Thermal
Expansion of Solid Materials by Thermomechanical Analysis,
West Conshohocken, PA, 2014.

13.ASTM D 696-16, Standard Test Method for Coefficient of Linear
Thermal Expansion of Plastics Between -30 oC and 30 oC, West
Conshohocken, PA, 2016.

14.Bhattachar, V.S., J. Test. Eval. 1997, 25(5), 479.

DOI: 10.1520/JTE11357J.

15.Kirby, R.K., J. Res. Natl. Bur. Stand. (U. S.), 1956, 57(2), 91.

16.Touloukian, Y.S., Kirby, R.T., Taylor, R.E., and Lee, T.Y.R.,
Thermal Expansion Nonmetallic Solids, Purdue Research
Foundation, New York-Washington, 1977, 13, 1443.