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Elastomers
BS4518 FKM O-Ring
Product Overview
KAFLON® BS4518 FKM O-Rings are high-performance sealing solutions manufactured according to the British Standard BS4518 specification, widely used in European industrial equipment and fluid sealing systems.
Made from premium FKM (Fluorocarbon Rubber), these O-rings provide excellent resistance to heat, oils, fuels, chemicals, and aggressive media, making them suitable for demanding environments such as oil & gas, automotive, chemical processing, and hydraulic systems.
Key Features & Benefits
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Excellent high temperature resistance
Outstanding chemical resistance
Superior oil and fuel resistance
Low compression set
Long service life in harsh environments
Manufactured according to BS4518 standard sizes
Typical Material Properties
| Property | Value |
|---|---|
| Material | FKM (Fluorocarbon Rubber) |
| Hardness | 70 / 75 / 90 Shore A |
| Temperature Range | -20°C to +200°C |
| Oil Resistance | Excellent |
| Chemical Resistance | Excellent |
| Compression Set | Low |
| Color | Black (custom colors available) |
Optional compliance:
FDA compliant FKM
NORSOK RGD resistant FKM
Low compression set compounds
Typical Applications
BS4518 FKM O-Rings are widely used in:
Hydraulic and pneumatic systems
Automotive engines and fuel systems
Oil & gas equipment
Industrial pumps and valves
Chemical processing equipment
Compressors and pressure regulators
These seals provide reliable performance in environments requiring high temperature resistance, chemical stability, and long-term durability.
Advantages of KAFLON® FKM O-Rings
Compared with standard rubber seals, FKM O-rings offer:
| Feature | Standard NBR | FKM O-Ring |
|---|---|---|
| Heat resistance | Medium | Excellent |
| Oil resistance | Good | Excellent |
| Chemical resistance | Limited | Excellent |
| Service life | Moderate | Long |
| High temperature sealing | Limited | Superior |
FAQ
1. What is a BS4518 FKM O-Ring?
These O-rings are widely used in industrial sealing applications due to their excellent heat resistance, chemical stability, and durability.
2. What is FKM material?
FKM (Fluoroelastomer) is a high-performance synthetic rubber known for its superior resistance to:
High temperatures
Oils and fuels
Aggressive chemicals
Ozone and weathering
Because of these properties, FKM O-rings are commonly used in oil & gas, automotive, aerospace, and chemical processing industries.
3. What temperature range can FKM O-Rings withstand?
Standard FKM O-Rings typically operate within a temperature range of:
-20°C to +200°C
Special FKM compounds can withstand temperatures up to +230°C depending on the formulation.
4. What are BS4518 O-Ring sizes?
The BS4518 standard defines O-ring dimensions based on:
Inner Diameter (ID)
Cross Section (CS)
This British standard size system is widely used in Europe and international industrial equipment.
5. Where are BS4518 FKM O-Rings commonly used?
Typical applications include:
Hydraulic systems
Industrial pumps and valves
Automotive engines and fuel systems
Chemical processing equipment
Oil & gas sealing systems
Compressors and pressure regulators
These applications require reliable sealing under high temperature, pressure, and chemical exposure.
6. Can FKM O-Rings be used in food or pharmaceutical equipment?
However, certification requirements should be confirmed depending on the specific regulatory standards.
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