Belzona 3412

A 2-part hybrid polymer coating for the encapsulation of any shape, size or configuration of flanged joint or other equipment. Designed to exclude moisture and prevent crevice, galvanic and atmospheric corrosion, Belzona 3412 is a tough, isocyanate-free, flexible topcoat which does not require heat or specialist tools for its application.

Belzona 3412 can be simply applied by brush or spray to new or deteriorated equipment to provide outstanding long-term corrosion protection. When used in combination with the release agent/corrosion inhibitor, Belzona 8411, the coating can be easily cut, peeled back and resealed to allow inspection of fastenings.

Additionally, Belzona 3412 can be used in conjunction with the Belzona Spray Gun. This facilitates a fast and efficient application whilst providing the same outstanding coverage and protection as a brush application.

Key benefits:

Outstanding corrosion protection
Peelable and resealable system, allowing easy access to fastenings if required
High visibility colour making repairs easily identifiable
Simple and quick to apply with no associated hot work
Fast cure to allow quick application
Excellent adhesion onto manually prepared surfaces
Excellent UV and environmental weathering resistance
Excellent heat resistance
Good fire resistance
Classed as low hazard making it safe to use
Brush or spray applicable

Applications for Belzona 3412 include:

Sealing of flanges, fastenings, fittings, connectors and other associated pipe elements
Preventing or stopping moisture ingress in various systems
Protection of new equipment from corrosion

* All products are subject to regional restrictions. Check with your local Distributor for more information

What are common problems with flanges?

One of the most common issues with flanges and their fastenings is corrosion, which can lead to joint failure, leaks, and costly downtime. This includes:

Crevice corrosion, which occurs in the narrow gaps between flange faces and around bolts where moisture and contaminants become trapped.
Galvanic corrosion, which happens when dissimilar metals (e.g., stainless steel bolts and carbon steel flanges) come into contact in the presence of an electrolyte.
Atmospheric corrosion, caused by long-term exposure to humidity, salt spray, and pollutants in the air.

Protective systems like Belzona 3412 are designed to encapsulate the entire flange assembly, preventing moisture ingress and isolating metal surfaces which significantly reduces the risk of corrosion.

How can I protect flanges from corrosion without dismantling equipment?

Belzona 3412 can be brush or spray-applied directly over flanges and pipe joints, forming a seamless, peelable membrane that seals out moisture and contaminants, all without the need for disassembly.

Is there an alternative to traditional flange protectors like mechanical covers, clamps and polymer tapes?

Yes, unlike tapes or bolt caps, Belzona 3412 adheres tightly to irregular surfaces, won’t shift or degrade over time, and can be cut and resealed for easy inspection, making it a superior flange protection solution.

How do I prevent moisture ingress in flange joints?

Moisture ingress is a leading cause of crevice corrosion in flanges. Belzona 3412 seals the entire flange assembly with a continuous membrane that prevents water ingress.