AS568-908 V90 FKM/Viton® O-Rings – High Heat & Chemical Resistant Fluorocarbon (FKM) 90 Durometer Brown (SAE-8)

Viton® (FKM) 90 Durometer O-Rings from The O-Ring Store LLC are engineered for extreme reliability in hydraulic, pneumatic, and chemical-processing environments. Designed to maintain seal integrity under heat, oil, and aggressive fluid exposure, this brown fluorocarbon O-ring offers excellent compression-set resistance, minimal swell, and long-term durability. The 90 durometer hardness provides enhanced extrusion resistance in high-pressure SAE Boss and hydraulic fittings, preventing costly leaks and downtime.

Operating temperature: -15 ° to +400 °F (-26 ° to +204 °C)

Material & Performance Details

Compound: Viton® / FKM Fluorocarbon
Durometer: 90 Shore A
Color: Brown

Viton® (FKM) provides superior resistance to petroleum-based oils, fuels, and solvents. Its high fluorine content ensures chemical stability in oxidizing and corrosive fluids, making it one of the most durable elastomers available.

Excellent resistance to:

• Petroleum oils & synthetic lubricants
• Diesel & aviation fuels
• Mineral oils & hydraulic fluids (Skydrol compatible with limitations)
• Ozone & weather aging
• Many aliphatic & aromatic hydrocarbons

Limited capability with:

• Low molecular ketones (acetone, MEK)
• Low molecular esters & ethers

Not compatible with:

• Brake fluids (glycol-based)
• Ammonia gas & amines
• Polar solvents (e.g., acetone, ethyl acetate)

Sizes & Measurements

• Cross Section (CS): 0.070 in (1.78 mm)
• Inside Diameter (ID): 0.364 in (9.25 mm)
• Outside Diameter (OD): 0.504 in (12.80 mm)
• Part Number: AS568-908 V90 FKM
• AS568 Dash Number: 908 (SAE-8)

Applications & Use Cases

Ideal for hydraulic fittings, high-pressure systems, and static or dynamic sealing in demanding environments. Commonly used in:

• Aerospace & aviation systems
• Hydraulic & pneumatic equipment
• Automotive fuel systems
• Oil & gas machinery
• Chemical processing plants
• Industrial valves and pumps

Key Specifications

• Material: Viton® / FKM Fluorocarbon
• Durometer: 90 Shore A
• Color: Brown
• Temperature Range: -15 °F to +400 °F (-26 °C to +204 °C)
• Pressure Rating: Up to 5,000 psi (dependent on groove design & application)
• Certifications: Meets SAE J200 M2HK requirements; available with full lot traceability

Why Buy from The O-Ring Store LLC

• ISO 9001:2015-certified quality processes
• USA stock for fast delivery
• Same-day shipping on in-stock items
• Custom sizes available on request
• Full lot traceability & CofC documentation
• Expert technical support from experienced staff
• Competitive pricing with uncompromised quality

FAQs

1. What’s the difference between Viton® 70 and Viton® 90 O-Rings?
The 90 durometer version (V90) is harder and designed for high-pressure applications, whereas 70 durometer is more flexible for general-purpose sealing.

2. Can Viton® O-Rings be used with brake fluid or ammonia?
No. Viton® is not recommended for glycol-based fluids or ammonia due to chemical attack on the polymer chain.

3. Are brown Viton® O-Rings the same as standard black FKM O-Rings?
The color difference typically indicates compound type or durometer; brown V90 FKM is a high-hardness, premium compound optimized for heat and pressure resistance.