Breakaway Coupling Materials Guide
Choosing the right breakaway coupling material is essential for ensuring chemical compatibility, corrosion resistance and reliable performance. Stainless steel, aluminium, brass and specialist alloys such as Hastelloy can all be suitable options, but the correct material depends on the transferred media, operating environment, pressure and temperature.
Material selection is not simply a question of strength. The body material, seals and other wetted components must work together to provide the required corrosion resistance, compatibility and service life.
Why Breakaway Coupling Material Selection Matters
A breakaway coupling is a safety device designed to separate under excessive force, helping to prevent equipment damage, uncontrolled product release and costly downtime.
Because the coupling sits directly within the fluid transfer path, the material selected for its body and wetted components can be just as important as the release mechanism itself.
The correct material depends on the application. A breakaway coupling used for general petroleum products may have very different material requirements from one handling aggressive chemicals, seawater, methanol, LNG or other demanding media.
Material compatibility should therefore be considered alongside:
- Transferred media
- Operating pressure
- Operating temperature
- Seal material
- Connection type
- Size
- Environmental conditions
- Required breakaway mechanism
Common Breakaway Coupling Materials
EWFM supplies breakaway coupling solutions in a range of materials, including stainless steel, aluminium, brass and specialist alloys such as Hastelloy.
The most suitable option should always be selected against the complete operating specification rather than material preference alone.
| Material | Key characteristics | Typical applications |
| Stainless Steel | High corrosion resistance; strong and durable; suitable for demanding industrial, marine, & cryogenic environments. | Chemical transfer, marine loading, cryogenic service, fuels, and general industrial applications. |
| Aluminium | Lightweight with good corrosion resistance in many environments; useful where weight reduction is important. | Road tanker loading, aviation, marine and general industrial transfer where media compatibility permits. |
| Brass | Good machinability and corrosion resistance for a range of conventional fluid-transfer duties. | Industrial fuel and fluid transfer applications where Brass is compatible with the media and operating conditions. |
| Hastelloy | Specialist nickel-based alloy offering excellent resistance to many aggressive and corrosive chemical environments. | Highly corrosive chemical service and specialised applications where standard Stainless Steel may not provide sufficient resistance. |
Stainless Steel Breakaway Couplings: A Versatile Choice
Engineers often specify stainless steel for breakaway couplings where durability and corrosion resistance are priorities.
Within EWFM’s breakaway coupling range, stainless steel is used across industrial, marine, cryogenic, in-line and other specialised designs.
For marine and offshore service, corrosion resistance is particularly important because equipment may be exposed to saltwater, humidity and harsh atmospheric conditions. Stainless steel can provide the robustness required for long-term service, subject to the specific transferred media and environmental conditions.
Aluminium Breakaway Couplings: When Low Weight Matters
Aluminium can be an attractive choice where a lighter breakaway coupling assembly is beneficial. Reducing component weight can make handling and installation easier, particularly within loading and unloading applications.
However, aluminium is not universally compatible with every chemical or operating environment.
The transferred media, concentration, temperature and surrounding environment should all be reviewed before specifying an aluminium breakaway coupling.
Brass Breakaway Couplings: Established Performance
Many fluid transfer applications use brass because it offers a practical balance of corrosion resistance, machinability and cost. It is available within EWFM’s industrial breakaway coupling range.
Only select brass after checking its compatibility with the transferred product, particularly where chemicals, unusual concentrations or elevated temperatures are involved.
Hastelloy Breakaway Couplings for Aggressive Chemicals
Hastelloy is a specialist nickel-based alloy family developed for demanding corrosion-service applications.
Where a fluid is particularly aggressive, standard stainless steel construction may not provide the required level of resistance. In these cases, a Hastelloy breakaway coupling may be considered.
EWFM’s Breakaway Coupling with Cable Control is available in Hastelloy and stainless steel, providing an option for applications where chemical resistance is a key part of the specification.
Breakaway Coupling Chemical Compatibility: Don’t Overlook the Seals
Selecting the coupling body material is only part of the process. The seals and other wetted components also need to be compatible with the transferred medium.
EWFM’s breakaway coupling range includes seal options such as:
- FKM
- EPDM
- FFKM
- NBR
- PTFE
- Other specialist materials depending on the coupling design
A coupling can have excellent corrosion resistance while still being unsuitable for an application if the seal material is incompatible with the product.
Media composition, concentration, temperature, pressure and exposure time should therefore be considered together when selecting a breakaway coupling.
Breakaway Coupling Material Selection Checklist
Before specifying a breakaway coupling and its construction materials, consider the following:
- What fluid or gas is being transferred?
- What is the concentration or grade of the product?
- What are the normal and maximum operating temperatures?
- What pressure and flow conditions will the coupling experience?
- Will the coupling be exposed to seawater, chemicals, humidity or other corrosive conditions?
- Which components are wetted by the product, including seals?
- Is weight a significant consideration for installation or operation?
- What size and connection type are required?
- What breakaway mechanism is required?
Providing this information helps you select a coupling material and seal configuration that suit the application.
Breakaway Coupling Materials for Different Applications
Material requirements can vary considerably between industries and fluid transfer applications.
Fuel and Petroleum Transfer
For fuel and petroleum transfer, aluminium, brass and stainless steel may all be appropriate depending on the transferred media, operating conditions and system requirements.
Chemical Transfer
Chemical applications often require a more detailed compatibility assessment. Depending on the chemical, its concentration and operating conditions, stainless steel, specialist alloys such as Hastelloy or specific seal materials may be required.
Marine Applications
Marine applications place additional emphasis on corrosion resistance and mechanical durability due to exposure to saltwater, humidity and demanding environmental conditions.
Cryogenic Applications
Cryogenic applications require coupling materials and seals capable of maintaining reliable performance at extremely low temperatures.
EWFM’s breakaway coupling portfolio covers industrial, marine, cryogenic, full-bore, in-line and engineered solutions, with options available across different sizes, materials, pressures and seal configurations.
Frequently Asked Questions About Breakaway Coupling Materials
What materials are breakaway couplings available in?
Manufacturers produce breakaway couplings in a range of materials to suit different designs and applications. Options within EWFM’s range include stainless steel, aluminium, brass and specialist alloys such as Hastelloy.
What is the best breakaway coupling material for chemical transfer?
There is no single material suitable for every chemical application. The correct material depends on factors including the chemical being transferred, its concentration, operating temperature, pressure and environmental conditions. Seal and wetted-component compatibility must also be considered.
When should a Hastelloy breakaway coupling be considered?
Hastelloy may be considered for particularly aggressive or corrosive chemical applications where standard stainless steel does not provide the required level of corrosion resistance.
Are stainless steel breakaway couplings suitable for marine applications?
Stainless steel can be suitable for marine and offshore applications due to its corrosion resistance and durability. However, the transferred media and complete environmental conditions should still be considered before specifying the material.
Do breakaway coupling seals need to be chemically compatible?
Yes. Selecting a suitable body material does not automatically make the complete coupling compatible with the transferred media. Seal materials such as FKM, EPDM, FFKM, NBR and PTFE must also be assessed against the product and operating conditions.
Need Help Selecting the Right Breakaway Coupling?
Choosing the right breakaway coupling involves more than selecting a body material. The transferred media, chemical compatibility, seals, operating pressure, temperature, connection type and application all need to be considered.
EWFM supplies Breakaway Couplings for a wide range of industrial, chemical, marine and cryogenic fluid transfer applications, with different materials and configurations available to suit specific operating requirements.
Visit the EWFM website for more information on Breakaway Coupling Materials Guide
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