M3Spray is a molten alloy spray designed to seal cracks, pinholes and defects in areas that are difficult to reach or processes which are hard to shutdown. M3Spray uses low melting point alloys that solidify on contact, creating a strong, reversible seal while your system stays online.
The spray head delivers a controlled stream of molten alloy driven by kinetic energy. As the alloy meets the leak site it cools and solidifies, closing off positive or negative pressure leaks in seconds. Typical operating temperatures are below 150 degrees C, which helps protect surrounding materials and coatings. When permanent works or decommissioning are needed, the alloy can be reheated and removed.
M3Spray equipment can be configured for close access use or for remote deployment in restricted or hazardous locations. Hose lengths can be adapted to suit the geometry of the asset and the working envelope.
Hand held systems for straightforward access
Remote or robot compatible variants in development
Configurable hose lengths for different reach requirements
M3Spray creates a solid metal seal, but it is not a permanent modification. The alloy can be reheated and removed, so equipment can still be inspected, overhauled or replaced later. You get rapid leak recovery now and the freedom to make longer term decisions on your own timetable.
Alloy can be reheated and safely removed
Original component can be accessed and inspected
Supports long term replacement and decommissioning plans
Handheld Application
Handheld M3Spray for fast in service repair
For quick, reactive and day to day maintenance, M3Spray is being developed into a compact handheld unit. The tool uses the same bismuth alloys, material compatibility and reversibility as full M3Spray systems, but in a simplified format that operators can pick up, heat up and use within minutes.
Leak sealing with bismuth alloys, using a handheld, button operated tool
Ready to use in a matter of minutes, reload with solid alloy and be ready to seal again
Simple controls and training, designed for use by site teams
Battery powered with positioning and integrated controls
Creates reversible metal seals for temporary or longer term repairs
M3Spray requires minimal surface preparation compared to other sealing techniques. Usually, removing dust and dirt is enough, though some applications may benefit from a mild chemical preparation depending on the scenario.
Yes. One of the key advantages of M3Spray is the ability to seal live leaks, even while the system is operational. This allows for leak repairs without shutting down the equipment, which saves time and reduces operational disruption.
Controlling overspray is essential for safety and precision. For every deployment, we implement suitable containment measures. We are also developing flexible solutions that could be used in a range of scenarios. Reach out to discuss further.
If your system is safety critical, we can carry out testing to make sure the spray does not contaminate the system. For example, our experience with SF6 gas sealing shows we can provide a safe, non-intrusive repair.
M3 Spray is highly versatile. It can be used for a range of leaks, predominantly liquid, both for emergency response and planned maintenance. If you have a leak, talk to us! We can assess your system and determine the most effective deployment method.
Yes! M3Spray can be reversed and even reused. This is standard practice at our facility, and we’re working on solutions to allow customers to reuse the spray safely in their own operations.
Currently, M3 Spray is suitable for use in temperatures up to 65°C. We have ideas how to extend its capability to higher temperatures, which could allow for applications like steam. If you have a requirements for higher temperatures get in touch!
Case studies
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.
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.
