FEP / PFA Encapsulated O-ring
An encapsulated O-ring is a rubber O-ring that's completely covered by a smooth, seamless layer of FEP or PFA. The plastic coating surrounds and protects the rubber core from liquids, chemicals and other surroundings.
Standard elastomer O-rings can react with chemicals or atmospheric gases, causing them to harden or become brittle. Encapsulated O-rings stop the elastomer core from touching the media, and their strong FEP/PFA coating makes them suitable for many different applications.
Benefits of Encapsulated 'O'-Rings and Seals
- Very tough against strong chemicals and doesn't let gases pass through easily
- Low friction, so equipment parts wear out less
- Keeps the stretchy, sealing action of a rubber O-ring
- Uses a single, standard material (MOC), so you don't need different parts for different jobs
- Doesn't get permanently squashed or slowly flow like some solid O-rings do
- Can handle heavy cleaning and sterilizing cycles (CIP, SIP)
- The surface won't corrode
- Meets common sanitary and safety rules (3-A Sanitary, USP Class VI, FDA 21 CFR 177.1550, BSE/TSE animal-safety, EU Regulation 1935/2004)
Hardness
- 85-90 Shore A for solid core Silicone
- 90-95 Shore A for solid core Viton®
- 75-80 Shore A for hollow core Silicone
Temperature Range
FEP Encapsulation: -60°C to +205°C. Short durations to +260°C.
PFA Encapsulation: -60°C to +260°C. Short durations to +300°C.
Typical Application
- Pumps and valves, chemical reactor vessels, mechanical seals
- Cartridge filters, pressure vessels, heat exchangers, autoclaves
- Cryogenics, hose couplings, pipelines, gas compressors, access covers
- Reusable syringes, high purity water, gas service
- Glass flanges, low pressure quick disconnect piping, vacuum service
- Large diameter access covers, relief and emergency valves, mixers and vessels
- Spray paint, photoelectric work, tank cars and trucks, filter elements
- Butterfly valves, air operated vents, scientific laboratory
- Lab reactors, sampling monitors, manways
- Leak free bottles, petroleum mixers, industrial concrete sprayer
- Stainless steel gas line holders, flowmeter
- Magnetic vacuum beaker vapors recovery adapters, chimney, bulkhead fitting
- Turbines, strainers, pressure pots
Elastomer Core Materials
FEP/PFA encapsulated O-rings are available with two core elastomer options — choose based on temperature requirements and flexibility needed.
Shore A 90–95 | -20°C to +220°C core
Harder, maximum chemical resilience. Best for demanding static sealing in aggressive chemical environments. Silicone (VMQ) Core
Solid: 85–90 Shore A | Hollow: 75–80 Shore A | -60°C to +200°C core
More flexible, superior low-temperature performance. Ideal for food, pharma and cryogenic applications.
Target Industry Sector
- Chemical Process, Aircraft and Aerospace, Gasoline and Chemical Transport
- Oil refineries, Scientific Glassware instruments, Automotive Components
- Food, Dairy and Beverage, Wine/Beer industry, Oil Extraction (on shore and off shore)
- Photochemical, Semi-conductor manufacture, Refrigeration Engineering
- Polymer Production, Dye and Paint manufacture, Paper and Pulp industry
- Cosmetics and Perfumery, Computer Chip Manufacturing Industry
Why Choose FITCO for Encapsulated O-Rings in the UAE
FITCO Orings Trading LLC is one of the leading suppliers of encapsulated O-rings in Dubai and the GCC region — extensive stock and fast delivery, custom sizes and materials, ISO and FDA-compliant products, expert technical guidance, and competitive pricing.