USP Medical Grade FEP Sealing Ring, PFA Encapsulated O-Ring, Fluoroelastomer FPM

USP Grade FEP Sealing Ring PFA Coated O-Ring Fluoroelastomer FPM Double-Layer PTFE Coated O-Ring Material Characteristics: Corrosion Resistance, High Temperature Resistance, Wear Resistance
Coated O-rings, also known as fluorinated O-rings or coated O-rings, are sealing components consisting of a relatively thick inner core made of materials such as silicone rubber or fluoroelastomer, combined with a relatively thin outer coating of PTFE/FEP/PFA or other materials. This product combines the elasticity and sealing properties of O-ring rubber materials with the chemical resistance of PTFE, FEP, PFA, and other materials, offering excellent sealing performance. Our company can customize coated O-rings in various colors and shapes according to customer-provided drawings, samples, specifications, and materials.

Main Features
Excellent chemical resistance, suitable for almost all chemical media, such as strong oxidizing and reducing solvents, with strong resistance to corrosion from strong acids and alkalis; wide temperature range from -200°C to 260°C; excellent compression resistance, ≥30%; extremely low friction coefficient, only 0.1~0.2; good anti-swelling property ≤0.1%; extremely high pressure resistance, up to 60 MPa; excellent sealing durability, increasing service life by more than 5 times.
Hardness Description
The average hardness of coated O-rings made of different materials is as follows:
Hollow Silicone Rubber: 75-80
Solid Silicone Rubber: 85-90
Solid Fluoroelastomer: 90-95
Material Description
FEP and PFA outer coating materials are essentially very similar, but PFA has better high-temperature resistance than FEP. The applicable temperature range for FEP is -60°C to 205°C, while for PFA it is -60°C to 260°C.
PFA Coated O-Ring, FEP Fluorinated O-Ring, Fluorinated O-Ring, Fluororubber Coated O-Ring, Fully Coated O-Ring Seal, PTFE Coated O-Ring
Fanpu Seal (full name: Fanpu Coated Sealing Ring, also known as Coated O-Ring or Fluorinated O-Ring) combines the elasticity and sealing properties of rubber with the chemical resistance of PTFE.
It consists of a silicone or fluoroelastomer inner core and a relatively thin FEP or PFA outer coating. Fanpu Seal offers excellent sealing performance.

Product Models:
Our company's brand series "Fanpu Seal" is divided into three series based on product structure and application conditions.
>>FEP Coated (cross-section can be O-shaped, square, or polygonal design) Click here
>>PFA Coated (cross-section can be O-shaped, square, or polygonal design) Click here
>>Spring Coated (internal spring can be S or O-shaped) Click here
Rubber O-rings are prone to wear, have poor chemical corrosion resistance, and low gas permeability resistance. Pure PTFE O-rings have high hardness and compression resistance but poor elasticity.
FEP/PFA coated O-rings have excellent anti-swelling and chemical stability (unless exposed to alkali metals, fluorine, and some halides at high temperatures) and exhibit good elasticity near rubber O-rings.
FEP/PFA has a very low friction coefficient (only 0.1~0.2) and excellent gas permeability resistance, making Fanpu Seal suitable for harsh environments.
Product Features:
—Outstanding chemical resistance, suitable for almost all chemical media (strong oxidizing and reducing solvents).
—Excellent corrosion resistance (strong acids and alkalis).
—Wide temperature range: -200°C to 260°C.
—Good compression resistance ≥30%.
—Low friction (friction coefficient as low as 0.1~0.2).
—Good anti-swelling property (≤0.1%).
—High pressure resistance (up to 60 MPa).
—Excellent sealing durability, increasing service life by 500%.
Applicable Equipment
—Pumps and valves
—Reaction vessels
—Mechanical seals
—Filters
—Pressure vessels
—Heat exchangers
—Boilers
—Pipeline flanges
—Gas compressors
—Dye manufacturing
—Paint spraying
Application Industries
—Chemical processes
—Aircraft manufacturing
—Pharmaceutical industry
—Oil and chemical transportation
—Oil refining
—Film industry
—Refrigeration engineering
—Food processing industry
—Paper industry
Material Introduction:

1. FEP and PFA materials are essentially similar, but PFA has better high-temperature resistance than FEP.
Applicable Temperature Range:
FEP Coating: -60°C to 205°C, can be used at 260°C for short periods.
PFA Coating: -60°C to 260°C, can be used at 300°C for short periods.
2. Our company's standard inner core materials for Fanpu Seal are:
Fluoroelastomer E-60C Grade
Silicone Rubber ZZR 765B Grade
Solid Fanpu Seal is the preferred choice, widely used in static and dynamic sealing. Hollow silicone rubber Fanpu Seal typically has a larger wire diameter and is used in static sealing, with lower hardness and compression resistance compared to solid Fanpu Seal.
Hardness:
The average hardness of Fanpu Seal made of different materials is as follows:
Solid Silicone Rubber: 85-90
Solid Fluoroelastomer: 90-95
Hollow Silicone Rubber: 75-80
Function:
The seamless and uniformly dense FEP/PFA outer coating combined with the rubber inner core ensures consistent sealing performance of the Fanpu Seal. The elasticity and compression are uniform at every point of the seal.
It can be reinstalled and reused even under continuous pressure. As medium pressure increases, the entire seal is compressed. Fanpu Seal acts like a high-viscosity liquid, transmitting pressure equally in all directions.
Compressibility:
The FEP outer coating provides Fanpu Seal with excellent resistance to hardening and brittleness, while the silicone or fluoroelastomer inner core ensures good elasticity even at 205°C.
A comparison of sealing performance in compression devices among Kalrez rubber, fluoroelastomer, and FEP-coated O-rings shows that Fanpu Seal, combining the physical properties of silicone or fluoroelastomer with the chemical properties of FEP/PFA, maintains rubber performance while offering good compression resistance.
The manufacturing of Fanpu Seal requires strict quality control. A special process ensures that the FEP polymer fully encapsulates the rubber inner core, and the O-ring meets the required standard tolerances.
The provided data demonstrates our strong commitment to the quality of Fanpu Seal products, based on performance testing and strict control to ensure customer satisfaction and safe use.
Compared to any other rubber or pure PTFE O-rings, Fanpu Seal offers unparalleled sealing performance and long service life, especially in harsh media.
Chemical Corrosion Resistance:
The outer FEP/PFA coating is a fundamental component of Fanpu Seal, providing excellent resistance to chemical erosion. Under normal operating temperatures, FEP/PFA is only affected by a few chemicals. Here, we list only the incompatible chemicals:
—Strong alkali metals, fluorine, and some halides are incompatible with FEP/PFA.
At high temperatures, FEP (recommended limit 204°C/400°F) and PFA (recommended limit 260°C/500°F) may react with high-concentration chemicals, such as 80% NaOH and KOH, metal hydrides like boron hydride (B2H6), aluminum chloride, ammonia (NH3), and some organic compounds containing amino (NH2) and imino (R=NH) groups.
At temperatures up to 250°C/480°F, they may also undergo slow oxidation reactions with 70% nitric acid. Special testing is required for use under these extreme conditions. Apart from these chemicals, Fanpu Seal is generally chemically inert to others.
Application Areas
Coated O-rings are mainly used in pumps, valves, reaction vessels, mechanical seals, filters, pressure vessels, heat exchangers, boilers, pipeline flanges, gas compressors, and related equipment. Key industries include machine tools, ships, automobiles, aircraft manufacturing, petrochemicals, oil refining, refrigeration engineering, food processing, pharmaceutical engineering, paper industry, construction machinery, and instrumentation.
Suzhou Yongxin Technology Co., Ltd. is a professional manufacturer of sealing components, specializing in the development, production, and sales of oil seals. We mainly produce and sell domestic and international sealing elements. We provide customers with sealing rings, O-rings, sealing ring specifications, O-ring specifications, Y-seals, sealing ring standards, rubber seals, V-seals, silicone seals, cylinder seals, sealing materials, high-temperature seals, graphite seals, fluoroelastomer seals, O-ring rubber seals, silicone rubber seals, Y-seal specifications, imported seals, J-seals, V-combination seals, fluoroelastomer seals, sealing ring specifications, sealing ring models, O-ring specification tables, C-seals, lip seal specifications, high-temperature O-rings, rubber seal specifications, imported O-rings, fluoroelastomer O-rings, silicone rubber O-rings, and other standard and non-standard sealing products for various industries. Yongxin Technology has professional production technology, advanced R&D talent, strict processing techniques, and testing methods, using high-quality materials and advanced formulations, continuously evolving with market demands.