Rawwater product being used to seal metal pipes

Metal seals that
keep critical infrastructure online

Reversible molten metal technology for industrial leak repair, applied without taking assets offline.

National Grid
Manchester Metropolitan University
ISO
Achilles
Tepco
National Grid
Manchester Metropolitan University
ISO
Achilles
Tepco

What is M3?

M3 is a range of low melting point bismuth alloys which, using our specially designed equipment, are applied to a leak or defect to form a repair. Typically deployed at 150°C the alloy seal can be placed without damaging the asset. Ideal for small bore pipework, complex assemblies and restricted access locations. Can be applied to flowing leaks on live systems to keep operations going while making the repair.

M3 is rapid, requires minimal surface preparation and can be applied to a wide range of materials including metals, plastics and concrete

Metal pipes

Three routes to sealed and stable

M3Spray

Molten alloy spray, applied directly against a flowing leak or defect with minimal surface preparation. Ideal for rapid response, complex assemblies and combined with robotics, applied in restricted access areas.

Read more about M3Spray

M3Cast

Alloy casting around pipes, joints and flanges. Custom moulds are placed around the repair site and filled with low melting point alloy for rapid, reversible leak recovery. Moulds are removed and reused.

Read more about M3Cast

SF6 Leak Sealing

A proven process that uses M3 technology to cut SF6 emissions from high voltage equipment while assets stay in service. Developed for small bore pipework and connections to date.

Read more about SF6 Leak Sealing
M3Spray
M3Cast

M3Spray

Molten alloy spray, applied directly against a flowing leak or defect with minimal surface preparation. Ideal for rapid response, complex assemblies and combined with robotics, applied in restricted access areas.

Read more about M3Spray
M3Spray

M3Cast

Alloy casting around pipes, joints and flanges. Custom moulds are placed around the repair site and filled with low melting point alloy for rapid, reversible leak recovery. Moulds are removed and reused.

Read more about M3Cast
M3Cast

SF6 Leak Sealing

A proven process that uses M3 technology to cut SF6 emissions from high voltage equipment while assets stay in service. Developed for small bore pipework and connections to date.

Read more about SF6 Leak Sealing
  • 20+

    Developing metal alloy sealing technologies for extreme environments.

  • 50+

    On electricity substations across the UK.

  • 15,000+ tCO2e

    Sealed while the leak was flowing.

  • 15 Bar

    Re-pressurisation tolerance demonstrated for M3 seals.

Built for critical applications

Nuclear facility

Leak recovery for the assets the world relies on

We specialise in low temperature, reversible alloy seals that can be applied to live systems. M3 is directed into cracks, joints and defects, then solidifies in place to create seals that can later be reheated and removed if further works are planned.

Adopted for use on high voltage substations, we help operators solve difficult leaks with minimal operating interruption. How could your industry benefit from improved maintenance with reduced operating downtime?

About us
Rawwater van with an employee using a machine
About us

Proof in Practice

M3 technologies have been trialled and deployed with leading utilities, moving from innovation projects into live operations.

Case studies from National Grid, and industrial clients show how M3 reduces leaks, avoids outages and supports net zero goals.

View case studies

Technical Underpinning of M3 Alloy Sealing for Nuclear Applications

High hazard industries require a considered approach, underpinned by data.

Read more about Technical Underpinning of M3 Alloy Sealing for Nuclear Applications

Development and Field Demonstration of M3 Technology for Transformer Oil Leak Sealing

National Grid Electricity Transmission (NGET) asked RW to investigate engineered solutions for sealing transformer oil leaks—an issue faced globally across transmission and distribution networks.

Read more about Development and Field Demonstration of M3 Technology for Transformer Oil Leak Sealing

Sealing SF6 Leaks from SmallBore Pipework

A case study of project work with National Grid Electricity Transmission.

Read more about Sealing SF6 Leaks from SmallBore Pipework

How Our SF6 Process Manages Hazards

Understanding the equipment, the environment, and the impact of your own intervention can only be done on site.

Read more about How Our SF6 Process Manages Hazards
View case studies

Talk to our leak recovery specialists

Get in touch to speak to one of our team about your needs and recommended M3 products.

Drag & Drop Files, Choose Files to Upload You can upload up to 2 files.