Typical Application Fields

Application Field	Specific Scenarios	Key Requirements
Chemical / Petrochemical	Reactor, distillation column, heat exchanger flanges	Corrosion resistance, high temperature, creep resistance
Semiconductor / Photovoltaic	High-purity gas/chemical delivery pipelines	Ultra-high purity, low outgassing, non-contaminating
Food & Pharmaceutical	Fermentation tanks, filling lines, CIP systems	FDA certified, non-toxic, easy to clean
Energy & Power	Nuclear/high-temperature steam lines in power plants	High temperature/pressure resistance, radiation resistance
Aerospace	Fuel systems, hydraulic systems, engines	Wide temperature range, media resistance, long life
Automotive Manufacturing	Fuel cells, new energy battery packs	Coolant resistance, reliable sealing

Technological Frontiers

1.  Multifunctional Composite Technology

       Conductive ePTFE Gaskets: Added carbon nanotubes, surface resistivity 10²-10⁶ Ω, for static dissipation.

       Thermally Conductive ePTFE Gaskets: Filled with boron nitride/alumina, thermal conductivity >1.5 W/m·K.

       Flame-Retardant ePTFE Gaskets: Special formulations achieving UL94 V-0 rating.

2.  Structural Innovation & Design

       Graded-Density Structure: Dense surface layer for permeation resistance, soft inner layer for high resilience.

       Corrugated/Serrated Structure: Increases localized contact pressure, optimizing sealing performance.

       Pre-compressed Forming: Pre-compressed ex-factory, achieving optimal seal immediately upon installation.

3.  Smart Sealing Technology

       Sensor-Integrated Gaskets: Embedded fiber optic sensors for real-time monitoring of seal status and temperature.

       Self-Healing Gaskets: Microcapsule technology that releases sealant upon micro-leakage.

Gasket Types & Structures

Gasket Type	Structural Features	Applicable Conditions	Sealing Mechanism
Standard Flat Gasket	Cut from uniform ePTFE sheet	General static seals, pressure <10 MPa	Compression-Recovery Seal
Inner Ring Gasket	ePTFE + 304/316L inner ring	High pressure, blow-out prevention, gasket protection	Inner Ring Positioning + Compression Seal
Clad Gasket	ePTFE envelope over graphite/ceramic fiber core	High temperature/pressure, anti-extrusion	Core Pressure Bearing + ePTFE Seal
Serrated/Corrugated Gasket	Embossed or serrated surface	Uneven flange surfaces	Line Contact, High Specific Pressure
Spiral Wound Gasket	Wound ePTFE filler strip + metal strip	High temperature/pressure, thermal cycling	Metal Skeleton Pressure Bearing + ePTFE Seal
O-Ring Cross-Section	ePTFE cord formed into O-ring shape	Groove seals, replacing rubber O-rings	Compression-Recovery, No Cold Flow
Custom-Shaped Gaskets	CNC cut / molded	Complex flange faces, non-standard equipment	Precise Fit to Sealing Surface

Key Performance Parameters Table

Performance Indicator	Standard ePTFE Gasket	Reinforced ePTFE Gasket	Test Standard
Density (g/cm³)	0.4 – 0.8	0.6 – 1.2	ASTM D792
Tensile Strength (MPa)	MD: 10-25 / TD: 5-15	MD: 15-40 / TD: 10-25	ASTM D638
Elongation at Break (%)	50 – 200	30 – 100	ASTM D638
Compressibility (%)	15 – 30	10 – 25	ASTM F36
Recovery (%)	40 – 60	30 – 50	ASTM F36
Creep Relaxation (%)	<5 (24h, RT)	<3 (24h, RT)	ASTM F38
Leak Rate (mbar·L/s)	<10⁻⁴ (Nitrogen)	<10⁻⁵ (Nitrogen)	EN 13555
Thermal Conductivity (W/m·K)	0.05 – 0.10	0.10 – 0.25	ASTM E1530

Chemical Resistance Table

Chemical Medium	Concentration	Max. Temp. (°C)	ePTFE Compatibility	Recommended Gasket Type
Hydrofluoric Acid	≤50%	100	Excellent	Standard or Reinforced
Concentrated Sulfuric Acid	98%	200	Excellent	Standard
Nitric Acid	68%	150	Excellent	Standard
Sodium Hydroxide	50%	100	Excellent	Standard
Aqua Regia	Concentrated	100	Excellent (short-term)	Reinforced
Acetone	Acetone	60	Excellent	Standard
Benzene	100%	100	Excellent	Standard
Liquid Oxygen/Nitrogen	-	-196	Excellent	Low-Temperature Specialized
Saturated Steam	-	315	Excellent	High-Temp Reinforced

Application Selection Guide

Application Scenario	Recommended Type	Key Parameters	Expected Service Life
Strong Acid Piping (Chemical)	Standard ePTFE Flat Gasket	Acid resistance, Thickness 2mm	5 – 8 years
High-Temp Steam Systems	Graphite-Filled Reinforced Gasket	315°C resistance, Creep resistance	8 – 10 years
Semiconductor High-Purity Gas	Ultra-High Purity ePTFE Gasket	Metal ions <10 ppb, Laser cut	10+ years
Food/Pharma Tank Vessels	FDA Certified White Gasket	Non-toxic, Easy clean, CIP/SIP resistant	5 – 7 years
Cryogenic Liquid Nitrogen Piping	Low-Temp Specialized ePTFE Gasket	Maintains elasticity at -196°C	10+ years
High-Pressure Reactors	ePTFE Clad or Spiral Wound Gasket	Pressure 25 MPa, Thermal cycling resistant	3 – 5 years (varies)
Uneven Flange Faces	Thick Soft Gasket (3mm)	Compensation ability >0.5mm	Case-dependent
Frequent Disassembly Areas	ePTFE Gasket with Inner Ring	Blow-out prevention, Easy alignment, Reusable 2-3x	Reliable per installation

Expanded PTFE (ePTFE) gaskets, with their unique microporous structure imparting high resilience, low creep, and exceptional chemical inertness, have revolutionized sealing solutions by overcoming the drawbacks of traditional PTFE gaskets, such as cold flow and frequent re-tightening needs. From extreme temperatures and highly corrosive media to high-purity requirements and long-life demands, ePTFE gaskets are steadily replacing traditional sealing materials due to their comprehensive performance advantages, establishing a leading position in high-end industrial applications.