Rubber Seals and O-Rings
FKM and FFKM O-Rings
FKM and FFKM O-rings for chemically demanding service.
Product Overview
FKM and FFKM O-rings for chemically demanding service. FKM O-rings are made from fluoroelastomer and resist a wide range of chemicals and temperatures, including petroleum products, hydraulic fluids and acidic compounds. FFKM, or perfluoroelastomer, is specified where the highest level of chemical resistance is needed, withstanding even the most aggressive chemicals in semiconductor manufacturing, chemical processing and similar industries.
Key benefits
Why Buyers Choose This Specification
FKM Covers Most Difficult Chemistry
Petroleum products, hydraulic fluids and acidic compounds are all within FKM's range. For the majority of aggressive industrial fluids, FKM is sufficient and much cheaper than FFKM.
FFKM for Almost Universal Resistance
Where the fluid defeats FKM, perfluoroelastomer offers almost universal chemical resistance. It is the material of last resort, and it is available here.
Two Grades From One Supplier
Having both means the specification can be stepped up only where it needs to be, rather than applying FFKM across a whole machine.
Temperature and Chemistry Together
FKM handles a wide temperature range as well as chemical exposure, which is what most high-temperature oil and fuel applications actually need.
Application scenarios
Where It Is Used
- Chemical processing seals for reactors, mixers and transfer systems
- Semiconductor manufacturing equipment seals
- Hydraulic fluid sealing at elevated temperature
- Petroleum product handling
- Acidic compound service
- High temperature sealing where nitrile fails
Who it is for
The Buyers This Product Suits
Chemical Processors
Seals for reactors, mixers and transfer systems are a named application for FKM.
Semiconductor Manufacturers
FFKM is specified for semiconductor manufacturing, where process chemistry is aggressive and contamination is unacceptable.
Engineers Facing Seal Failures
Where nitrile is failing on chemistry or temperature, FKM is usually the next step and FFKM the one after.
Problems it solves
What It Fixes
Seals Attacked by Process Chemistry
FKM resists petroleum products, hydraulic fluids and acidic compounds; FFKM withstands even the most aggressive chemicals.
Nitrile Failing at Temperature
FKM offers a considerably wider temperature range than nitrile in the same seal geometry.
Over-Specifying FFKM Everywhere
Having both grades available means FFKM is used only where FKM genuinely cannot cope.
Specifications
Published Figures For This Product
Every value below comes from our own product specification. Where a figure is not published we leave it out rather than estimating it.
| FKM Material | Fluoroelastomer |
|---|---|
| FKM Resistance | Petroleum products, hydraulic fluids, acidic compounds, wide temperature range |
| FFKM Material | Perfluoroelastomer |
| FFKM Resistance | Almost universal chemical resistance |
| FFKM Industries | Semiconductor manufacturing, chemical processing |
| Chemical Processing Use | Seals for reactors, mixers and transfer systems |
| Grade | Fluoroelastomer and perfluoroelastomer |
Packing and documents
How It Ships And What Comes With It
Packing And Loading
Shipping volume for this item depends on the configuration and capacity you select, so no fixed container figure is published. Confirm the specification and the destination and a loading plan is issued with the quotation, rather than a figure we cannot support.
Documentation On File
- Rubber Seals and Plastics · Rubber Seals and O-Rings Specification Sheet20.5 KB
- Catalogue · Full Product Catalogue154.0 KB
Sourcing And Inspection
This product is supplied through TrueGlow Imaging, working with manufacturing partners whose facilities are visited and verified rather than taken on trust. In-process quality control and delivery supervision are available so goods are inspected before the container is sealed. Certifications quoted on this page are those stated on the product specification and belong to that product range rather than to our trading entity, so ask for the certificate covering your specific item.
Handling guide
Getting It Right First Time
Step 1
List every fluid the seal will contact, including cleaning chemicals, before selecting.
Step 2
Try FKM first, and step up to FFKM only where the chemistry defeats it.
Step 3
Confirm the maximum and minimum operating temperatures, not just the nominal.
Step 4
Measure inside diameter and cross-section for replacement seals.
Step 5
Budget FFKM carefully, since it is far more expensive than FKM per piece.
Comparison
How It Compares In Our Range
FKM against FFKM, and when to step up.
| FKM O-Ring | Fluoroelastomer with superior resistance to a wide range of chemicals and temperatures, including petroleum products, hydraulic fluids and acidic compounds. |
|---|---|
| FFKM O-Ring | Perfluoroelastomer with almost universal chemical resistance, for semiconductor manufacturing, chemical processing and the most aggressive chemicals. |
FAQ
FKM and FFKM O-Rings Questions
What is FKM?
A fluoroelastomer offering superior resistance to a wide range of chemicals and temperatures.
What is FFKM?
FFKM stands for perfluoroelastomer, designed to withstand even the most aggressive chemicals and offering almost universal chemical resistance.
Which should we specify?
FKM handles petroleum products, hydraulic fluids and acidic compounds. Step up to FFKM only where the chemistry defeats FKM.
Which industries use FFKM?
Semiconductor manufacturing, chemical processing and similar industries with aggressive process chemistry.
Where is FKM used in chemical processing?
In seals for reactors, mixers and transfer systems.
Can you supply custom sizes?
Yes. Send the inside diameter, cross-section, fluid and temperature range.
Related products
Other Products Buyers Look At
Industries
Sectors That Use This Product
Metal Fabrication and Machine Shops
Custom parts, tooling and the cranes that move them around the shop.
Warehousing and Heavy Industry
Lifting from 250 kg to 360 tons, indoors on a runway or outdoors on legs.
Food Packaging Lines
Depalletizing to palletizing, balanced against the filler in the middle.
Further reading
Guides That Cover This Product
Selecting an O-Ring Material NBR EPDM FKM or FFKM
Almost every seal failure is a material selection error rather than a dimensional one. The fluid and the temperature decide the elastomer, and the size is the easy part.
Quote FKM and FFKM O-Rings
Send the capacity or size you need, the quantity and the destination, and we will confirm the configuration, the lead time and a loading plan.