Fluorosilicone O-Rings » FVMQ Orings and FK O-rings

Fluorosilicone combine most of the attributes of silicone with resistance to petroleum oils and hydrocarbon fuels. Fluorosilicone o-rings are commonly used in aircraft fuel systems. Fluorosilicone o-rings are commonly referred to as FVMQ orings, or FK o-rings. Columbia offers a complete selection of both the standard AS568 o-ring and metric o-ring sizes. Columbia can also develop custom Fluorosilicone o-rings to meet customer applications or specifications.

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Fluorosilicone Orings » Chemical Compatibility Overview

Fluorosilicone
Chemical Resistance
Very
Good
Good
Fair
Poor
Alcohols   2    
Aromatic Mineral Oils (IRM 903) 1      
Automotive Refrigerants 1      
Brake Fluids, Non-Petroleum       4
Dilute Acids 1      
Dilute Alkalis 1      
Fuels 1      
Hydrocarbon Fuels 1      
Ketones       4
Low mol wt Aromatic Hydrocarbons 1      
Petroleum Oils 1      
Silicone Fluids 1      
Transmission Fluids (Type A) 1      

Fluorosilicone Compound » Chemical Compatibility Lookup

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*Due to the number of interacting forces, it is STRONGLY RECOMMENDED THAT YOUR ELASTOMER SELECTION BE RIGOROUSLY TESTED IN THE ACTUAL APPLICATION, performance assumptions must be checked so that you are certain that all variables have been carefully considered.

Fluorosilicone O-Rings » Physical Properties Overview

Fluorosilicone
Physical Properties
Very
Good
Good
Fair
Poor
Abrasion Resistance       4
Acid Resistance     3  
Chemical Resistance 1      
Cold Resistance   2    
Compression Set Resistance   2    
Dynamic Properties       4
Electrical Properties 1      
Elongation     3  
Flame Resistance   2    
Heat Resistance 1      
Impermeability       4
Oil Resistance   2    
Ozone Resistance 1      
Tear Resistance       4
Tensile Strength     3  
Water / Steam Resistance     3  
Weather Resistance 1      
*The chemical compatibility and physical properties are listed as general characteristics of the Fluorosilicone o-ring compound. Speciality compounds can be derived to enhance or modify the performance to meet o-ring's application needs.

Fluorosilicone Compound » Compound Attributes

Chemical Description Fluorosilicone rubber
Abbreviations (ASTM 1418) FVMQ
ISO / DIN FVMQ
Other Trade Names FVMQ
ASTM D2000 Designations FK
Low Temperature Range -75°F / -59°C
High Temperature Range 450°F / 232°C
*The Fluorosilicone o-ring compound attributes are used to outline the basic properties. Fluorosilicone o-ring attributes can be adjusted by modifying the basic compound.

Custom Fluorosilicone O-Rings

Fluorosilicone O-rings can be made in custom sizes to fit any application specific needs. Our engineering staff can review your application and design a solution that satisfies those requirements. You can find assistance with o-ring gland design here. You can find assistance with o-ring design here. To request a quote on your o-ring specifications please submit a RFQ here.

Standard AS568 Fluorosilicone O-Rings

All stocked Fluorosilicone AS568 o-rings have three measurement types. First, a nominal inch reference, then actual inch sizes, and finally the metric size displayed in millimeters. Fluorosilicone o-rings are stocked and cataloged by their AS568 number. This number references the Aerospace Standard 568 (AS 568) which was published by the SAE (Society of Automotive Engineers). Each o-ring is assigned a dash number which correlates directly to an exact o-ring size. You may view a complete chart of these o-ring sizes here.

Standard Metric Fluorosilicone O-Rings

Fluorosilicone O-rings are available in several metric sizes. Fluorosilicone metric O-rings are cataloged by their cross section and inside diameter. Columbia references the metric Fluorosilicone o-rings by the compound number and the cross section along with the inside diameter. You may view a complete chart of the metric o-ring sizes here.
O-ring Measurement Chart
Fluorosilicone oring,  FVMQ O-Ring Geometery
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