Belzona SF6 FIX   

Industry-leading corrosion protection solutions engineered to extend asset life, reduce downtime, and cut maintenance costs. Even in immersion, high-temperature, and chemically aggressive environments.

Belzona SF6-FIX is Belzona’s latest solution for the power transmission and distribution industry. Belzona SF6-FIX is a sulphur hexafluoride SF6 breaker solution that can be applied online, and without specialist tools. This highly effective system can reduce SF₆ Gas Leaks in switchgear to undetectable levels. 


Commonly used in electricity substations, SF₆ gas is used to insulate live electrical parts in medium and high voltage electrical equipment and to switch the flow of electrical current on and off. However, leaks of this gas are very common. With Belzona SF6-FIX, leaks can be quickly and expertly sealed resulting in huge environmental and financial savings. 100% solids and cold applied, Belzona safely seals SF₆ leaks and protects the environment, plus, this durable system of expertly applied specialist materials can be applied in just one day.                                         

A ​Solution for Repair a SF6 Gas Circuit Breaker Leaks

"Stop SF6 switchgear leaks—contact us to seal your grid and protect your environment!

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Key Benefits of Belzona SF6-FIX:

  • Online application, minimum downtime
  • Rapid installation, short cure times
  • Can reduce leaks to undetectable levels
  • Removable for joint access
  • Excellent corrosion protection

Why is SF₆ Used in Circuit Breakers?

SF₆ gas is widely used in electricity substations to insulate live components in medium- and high-voltage equipment. Its insulating and arc-quenching capabilities make it a key component in SF₆ gas circuit breakers, where it safely manages the switching of electrical currents.


SF₆ has a dielectric strength approximately three times greater than air, meaning it can withstand much higher voltages without breaking down, allowing electrical components to be placed closer together. As a result, gas insulated switchgear and circuit breakers filled with SF₆ can be made more compact, reducing the overall footprint of high-voltage installations. However, concerns around SF₆ leakage and its environmental impact have prompted increasing attention to switchgear maintenance and leak prevention.

SF₆ Regulations and F-Gas Compliance

The EU F-Gas Regulation (2024/573) restricts the use and emissions of fluorinated gases, including SF₆. Under these regulations SF₆ leakage prevention and repair is required, and the use of alternative technologies is encouraged. The US has similar regulations, and they exist worldwide, due to the global warming potential of SF₆, making compliance an operational necessity.


Belzona SF6-FIX can support power companies in meeting leak prevention goals, avoiding regulatory penalties, and maintaining ESG (environmental, social, and governance) standards.

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SF6 Gas leaks Repair People ask:

Long-term prevention includes:

  • Routine leak inspections
  • Proper torque procedures
  • Corrosion protection coatings
  • Structural composite reinforcement on damaged areas

A proactive repair strategy reduces recurring leaks, downtime, and environmental exposure.

SF6 gas leaks are typically caused by:

  • Aging gaskets and seals
  • Flange surface corrosion
  • Casting porosity
  • Thermal expansion and contraction
  • Improper torque on bolted connections

Over time, pressure cycling and vibration create pathways that allow SF6 gas to escape, especially in GIS and circuit breaker systems.

A permanent SF6 gas leak repair requires:

  1. Accurate leak detection
  2. Surface preparation
  3. Application of a structural composite repair material
  4. Full cure before repressurization

In many cases, yes. SF6 gas leaks can be repaired online using cold-curing composite systems that:

  • Require no hot work
  • Produce no sparks
  • Do not weaken surrounding metal

This reduces downtime and avoids costly power interruptions.

SF6 itself is non-flammable and non-toxic in pure form, but leaks pose risks such as:

  • Oxygen displacement in confined spaces
  • Formation of harmful byproducts after arcing
  • Environmental impact (very high global warming potential)

Even small leaks should be repaired immediately to ensure safety and regulatory compliance.

Temporary sealants often fail because they:

  • Do not bond structurally
  • Degrade under pressure cycling
  • Cannot seal microscopic porosity

A bonded composite repair system prevents recurring leakage by restoring surface integrity.

Yes. Flange face corrosion, uneven gasket compression, and bolt relaxation are common sources of SF6 pressure loss.

Restoring the flange surface and sealing with a structural polymer eliminates gas migration paths.

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