Gaskets are one of those components that rarely get attention—until they fail. When they do, the result is usually leakage, downtime, or contamination that costs far more than the gasket itself.

Getting gasket material selection right is about matching the material to the fluid, pressure, temperature, and flange type. The three most common options in industrial applications are EPDM, PTFE, and Nitrile.

Why Gasket Material Selection Matters

A gasket’s job is simple: create a reliable seal between two flanges. But the environment it operates in is not simple.

Poor selection can lead to:

• Chemical breakdown
• Compression set (losing elasticity)
• Flange face damage
• Persistent leaks under pressure

In short: the wrong gasket will always fail—it’s just a matter of when.

EPDM vs PTFE Gasket: The Key Differences

EPDM (Ethylene Propylene Diene Monomer)

EPDM rubber

Best for:

• Water systems
• Steam applications (moderate conditions)
• HVAC systems
• Diluted acids and alkalis

Strengths:

• Excellent weather and UV resistance
• Good flexibility and sealing under compression
• Cost-effective

Where EPDM FAILS ❌:

• Oils and hydrocarbons (it swells and degrades)
• High-temperature oil systems
• Fuel applications

👉 If oil is involved, EPDM is the wrong choice.

PTFE (Polytetrafluoroethylene / Teflon)

PTFE (Teflon)

Best for:

• Aggressive chemicals
• High-purity systems
• Food and pharmaceutical processing
• Corrosive environments

Strengths:

• Near universal chemical resistance
• Handles wide temperature ranges
• Non-reactive and clean

Where PTFE FAILS ❌:

• Poor elasticity (doesn’t “bounce back”)
• Requires higher bolt loads to seal
• Can creep under long-term pressure

👉 PTFE doesn’t fail chemically—it fails mechanically if installed poorly.

Nitrile (NBR)

Nitrile rubber (NBR)

Best for:

• Oils and fuels
• Hydraulic systems
• Petroleum-based fluids
• Industrial equipment

Strengths:

• Excellent oil resistance
• Good compression set resistance
• Cost-effective for general industrial use

Where Nitrile FAILS ❌:

• Ozone and weather exposure
• Steam and high heat environments
• Strong acids and solvents

👉 Nitrile is perfect for oil systems—but not outdoor or chemical-heavy environments.

Flange Gasket Types Explained

Choosing the right material is only half the equation. The gasket style also matters.

1. Full Face Gaskets

• Covers entire flange face
• Used in flat face flanges

Best for: low pressure water and general service
Risk: incorrect bolt loading causes uneven sealing

2. Ring Type Gaskets

• Sits inside bolt circle
• Most common industrial option

Best for: higher pressure systems
Failure point: misalignment during installation

3. Spiral Wound Gaskets

• Metal + filler material combination
• Designed for high pressure and temperature

Best for: oil, gas, steam, petrochemical systems
Failure point: incorrect compression torque

Quick Selection Guide

If you strip it down simply:

• Water / HVAC / mild chemicals → EPDM
• Aggressive chemicals / food / pharma → PTFE
• Oil / fuel / hydraulics → Nitrile

But always check:

• Temperature range
• Chemical compatibility
• Flange type and pressure class

The Most Common Gasket Failure (and it’s not the material)

Most failures don’t come from the wrong rubber—they come from:

• Over-tightening bolts
• Uneven torque sequence
• Reusing compressed gaskets
• Misaligned flanges

Even the best gasket will fail if installation is wrong.

Final Thoughts

Good gasket material selection is about understanding the environment first—not just picking what’s cheapest or most common. EPDM, PTFE, and Nitrile each have very clear strengths and very clear limits.

Match the material to the application, not the other way around.

Need Help Choosing the Right Gasket?

Fox Global supplies a full range of industrial gaskets, hose systems, valves, and sealing solutions tailored for Australian industry.

📞 Call 1300 852 795
📧 Email sales@foxglobal.com.au