AS568-208 Aflas (TFE/P, FEPM) 80 Duro O-Ring Black

Made-To-Order - Built to Keep Hot, Chemically Demanding Equipment Sealed Longer

The AS568-208 Aflas O-Ring is made for customers who need stronger sealing performance in harsh chemical, steam, amine, and high-temperature environments where standard Buna-N or many fluorocarbon materials may not hold up. This black Aflas TFE/P, FEPM O-Ring helps reduce leaks, downtime, and repeat maintenance by providing dependable sealing in demanding industrial service.

Made from Aflas TFE/P, also known as FEPM, this 80 durometer black O-Ring is a strong choice for oilfield equipment, chemical processing, steam service, sour gas exposure, and high-pH applications. It gives maintenance teams and OEM buyers a reliable option when chemical resistance and heat stability matter more than low-cost sealing.

Operating Temperature

Operating temperature: +25° to +450°F (–4° to +232°C)

Material & Performance Details

Aflas TFE/P, FEPM is a specialty fluoroelastomer designed for excellent resistance to heat, steam, acids, bases, amines, and oilfield chemicals. The 80 durometer hardness provides a firmer seal than standard 70 duro compounds, making it useful where higher pressure, tougher service conditions, or extrusion resistance are concerns.

Chemical compatibility:

• Excellent resistance to:
  • Steam
  • Hot water
  • Acids
  • Bases
  • Amines
  • Sour gas
  • H₂S
  • Crude oil
  • Hydraulic fluids
  • Phosphate ester fluids
  • Engine oils
  • Transmission fluids
• Limited capability with:
  • Aromatic fuels
  • Ketones
  • Some chlorinated solvents
  • Low-temperature dynamic sealing
• Not compatible with:
  • Most automotive gasoline fuels
  • Aromatic hydrocarbons
  • Toluene
  • Benzene
  • MEK
  • Acetone

Sizes & Measurements

• Dimensions: 5/8"ID X 7/8"OD X 1/8"CS
• Actual: 0.609"ID X 0.139"CS
• Metric: 15.47mm ID X 3.53mm CS
• Part Number: A75208
• AS568 Dash Number: AS568-208

Applications & Use Cases

The AS568-208 Aflas O-Ring is commonly used in chemical processing equipment, oil and gas systems, steam service, pumps, valves, compressors, hydraulic equipment, drilling tools, and industrial maintenance applications. It is a good fit when customers need better resistance to heat, steam, amines, acids, bases, and sour gas than many standard O-Ring materials can provide.

Key Specifications

• Material: Aflas TFE/P, FEPM
• Durometer: 80 Shore A
• Color: Black
• Cross Reference Material Names: Aflas, TFE/P, FEPM
• Size Standard: AS568
• Dash Size: -208
• Temperature Range: +25° to +450°F (–4° to +232°C)
• Certifications: Available on request if applicable to lot and manufacturer
• Pressure Rating: Application dependent based on gland design, clearance gap, temperature, and system pressure

Why Buy from The O-Ring Store LLC

The O-Ring Store LLC makes getting O-Rings easy by helping customers find the right size, material, and sealing option without wasting time. Our ISO9001:2015 certified quality processes support consistent order handling, traceability, and customer confidence.

We stock many O-Rings in the USA for fast delivery, offer same-day shipping on in-stock items, and can help with custom sizes when standard AS568 parts do not fit the application. Full lot traceability and documentation are available on request. Our experienced staff can help review material choices, chemical exposure, temperature limits, and practical substitution options so customers get the right seal with less downtime and less guesswork.

Common FAQs

What is Aflas best used for?
Aflas is best used in high-temperature, steam, amine, acid, base, sour gas, and oilfield applications where standard elastomers may fail too quickly.

Is AS568-208 a standard O-Ring size?
Yes. AS568-208 is a standard inch-size O-Ring with an actual 0.609" ID and 0.139" cross section.

Is Aflas the same as Viton?
No. Aflas and Viton are both fluoroelastomers, but they have different chemical strengths. Aflas is often better for steam, amines, acids, bases, and sour gas. Viton is often better for fuels and many hydrocarbons.