Fluorosilicone O-Rings

Common Names: 

Fluorosilicone, FVMQ

Trade Names:

Silastic® LS,   FSE

General Description:

Fluorosilicone is a widely used elastomer that can be compounded to meet a wide range of applications.  The mechanical and physical properties are very similar to silicone rubber. However, fluorosilicone offers improved fuels and mineral oil resistance but poor hot air resistance when compared with silicone. This material is widely used in semiconductor Ashing equipment for its resistance to oxygen plasma. 

Popular Compounds:

Hundreds more specialty compounds available. Contact a Marco Sales Consultant or Engineer for more information.

Marco CPD# Base Material Color Duro (Shore A) Relative Price Typical Inventory Level High Temp (F) Low Temp (F) Steam < 300 F Steam < 400 F Compression Set Chemical & Solvents Sunliight, Ozone, UV Wear Abrasion Permeation Vacuum Petroleum Oils & Hydraulics Fuels & Gas Brake Fluids
1 = Great    2 = Good    3 = Fair    4 = Poor
Fluorosilicone (FVMQ)  Blue  70  High 350  -80  3
Aerospace Military Specification Mil-Spec AMS-R-25988 M25988/1-### per Mil-R-25988 CL-1 GR-70, jet fuel resistance
Fluorosilicone (FVMQ)  Blue  75 Low 350  -80  3
Aerospace Military Specification Mil-Spec AMS-R-25988 M25988/2, jet fuel resistance
Fluorosilicone (FVMQ)  Blue  60  Low 350  -80  3
Aerospace Military Specification Mil-Spec AMS-R-25988 M25988/3, jet fuel resistance
Fluorosilicone (FVMQ)  Blue  40  Low 350  -80  3
Jet fuel resistance

Service Temperature Range:

The temperature ranges presented above are approximations for dry air service only and should not be used to determine design specifications or end-use temperature limits. Actual temperature range of a compound in an end-use application is highly dependent on part type, hardware configuration, applied forces, chemical media, pressure and thermal cycling effects, and other factors. The most practical way of determining an end-use temperature range is testing in the actual application conditions. Consult a Marco Engineer for more details.




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