Belzona 3412
Flexible and peelable system, used for encapsulating flanges and bolt fastenings to protect against moisture ingress and prevent corrosion.
A 2-part hybrid polymer flange and bolt encapsulation coating providing peelable and resealable long-term corrosion protection.
- SeriesBelzona 3000 Series
- Documents6
Overview of 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 resistance to corrosion in salt spray and chemical environments
Can be cut, peeled back and resealed allowing easy access to fastenings for inspection
High visibility colour making repairs and inspections easily identifiable
Easy to mix and apply without specialist tools
Cures rapidly even at low temperatures for fast back in service time
Bonds strongly to virtually any rigid surface
Excellent UV and environmental weathering resistance for outdoor exposure
Conforms to Class O surface UK Building Regulations and Class A ASTM E84 fire resistance
Applied by brush or spray for fast and efficient coverage
Application Areas
What this product handles, grouped by equipment area — each links to the full application.
Valves, Pipes & Fittings
3 applicationsTechnical Data
Base Component
- Appearance
- Thixotropic liquid
- Color
- Gray or Orange
- Density
- 1.25 - 1.29 g/cm³
Solidifier Component
- Appearance
- Clear, colourless liquid
- Density
- 0.94 - 0.98 g/cm³
Mixed Properties
- Density
- 1.22 - 1.26 g/cm³
Tensile Strength & Elongation (ASTM D412 Die C, 20°C cure)
- Tensile Strength Reinforced (Belzona 9311)
- 5.5 MPa (800 psi)
- Tensile Strength Unreinforced
- 3.4 MPa (500 psi)
- Elongation Reinforced (Belzona 9311)
- 52%
- Elongation Unreinforced
- 260%
Tear Strength (ASTM D624, 20°C cure)
- Reinforced (Belzona 9311)
- 3,180 kg/m (180 pli)
- Unreinforced
- 1,830 kg/m (100 pli)
Hardness
- Shore A (ASTM D2240, 20°C cure)
- 65
Peel Adhesion (ASTM D429, 90° peel)
- Manually prepared carbon steel (St 2)
- 107 kg/m (6.0 pli)
- Solvent-free epoxy paint
- 146 kg/m (8.2 pli)
- Solvent-borne polyurethane paint
- 196 kg/m (11.0 pli)
Corrosion & Weathering
- Salt Spray (ASTM B117)
- 3,000 hours with no rusting or blistering (combined Belzona 3412 + Belzona 8411 system)
- Dry Heat Resistance
- 8,500 hours at 90°C (194°F), retaining 25% elongation, 800 kg/m tear strength, 2.1 MPa tensile
- UV Resistance
- No significant chalking or color change after 8,500 hours ISO 4892-2 (Xenon Arc)
Service Temperature Limits
- Low temperature flexibility
- Maintains flexibility down to -22°C (-8°F), passing ASTM D522 mandrel test at minimum 3.2 mm diameter
- Dry heat tested
- 8,500 hours at 90°C (194°F)
- Cure temperature
- Cures at ambient temperatures with no hot work required
Mixing & Application
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