AS568-118 Simriz® 485 Broad Chemical Resistance (FFKM) O-Ring

7/8"ID X 1-1/16"OD X 3/32"CS 

When failure is not an option, the FFKM-118 SZ485 O-Ring delivers extreme chemical resistance, high temperature stability, and long service life in the most aggressive environments. Designed for engineers and maintenance teams that cannot afford leaks, downtime, or repeat replacements, this O-Ring keeps systems sealed and running longer.

Made from premium FFKM (Perfluoroelastomer) in a 75 durometer hardness, this black compound offers near-universal chemical compatibility and exceptional thermal performance. It is ideal for critical applications where standard materials like FKM or EPDM fall short.

Operating temperature: -15° to +600°F (–26° to +315°C)

Material & Performance Details

This O-Ring is manufactured from high-performance FFKM, one of the most chemically resistant elastomers available. It is engineered for harsh process environments involving aggressive chemicals, high heat, and extended service intervals.

The 75 durometer hardness provides a balance of sealing force and durability, while the black compound ensures consistent identification in industrial systems.

Excellent resistance to:

• Acids (strong and weak)
• Ketones and aldehydes
• Amines and solvents
• Steam and hot water
• Fuels and hydrocarbons

Limited capability with:

• Rapid temperature cycling applications
• Some low-temperature dynamic sealing

Not compatible with:

• Applications requiring high elasticity at very low temperatures
• Cost-sensitive applications where FFKM is not required

Sizes & Measurements

• Dimensions: 2-7/8" ID X 3-1/8" OD X 1/8" CS
• Actual: 2.862" ID X 0.139" CS
• Metric: 72.70mm ID X 3.53mm CS
• Part Number: FFKM-118-SZ485
• AS568 Dash Number: -118

Applications & Use Cases

This FFKM O-Ring is built for the toughest sealing environments where reliability directly impacts production uptime and safety. Common applications include:

• Chemical processing systems
• Semiconductor manufacturing
• Oil and gas equipment
• Aerospace and high-performance fluid systems
• Pharmaceutical and clean processing environments
• High-temperature pumps, valves, and reactors

If your system runs hot, handles aggressive media, or cannot tolerate failure, this is the right material choice.

Key Specifications

• Material: FFKM (Perfluoroelastomer)
• Durometer: 75 Shore A
• Color: Black
• Certifications: Available upon request (varies by batch)
• Temperature Range: -15°F to +600°F (-26°C to +315°C)
• Pressure Rating: Application dependent

Why Buy from The O-Ring Store LLC

We focus on getting you the right seal the first time so your operation keeps moving. That means less downtime, fewer replacements, and no guesswork.

• ISO9001:2015 certified quality processes
• USA stock for faster delivery
• Same-day shipping on in-stock items
• Custom FFKM compounds and sizes available
• Full lot traceability and documentation available
• Experienced team that understands sealing applications
• Competitive pricing without cutting corners

You are not just buying an O-Ring. You are getting a sealing solution backed by people who care about your outcome.