Belzona 2221
MP Fluid Elastomer
A tough, flexible multi-purpose polyurethane elastomer for the repair and coating of rubber components and metal surfaces and casting of new components.
A 2-part polyurethane resin for casting and brush- or pour-applied rubber repair with up to 700% elongation.
- SeriesBelzona 2000 Series
- Documents6
Overview of Belzona 2221
A 2-part polyurethane resin designed for the repair and coating of rubber and metal components, as well as casting of new components. This flexible rubber repair material makes cost effective repairs possible and is designed for applications where durability and elasticity are required. It is easy to mix and apply by brush or by pouring without the need for specialist tools and will cure at room temperature, eliminating the need for hot work and vulcanisation.
Key Benefits
Cures at room temperature with no hot work or vulcanisation
Can be poured or injected into moulds for casting unique components
Bonds to natural rubber, nitrile, neoprene, SBR, polyurethane, PVC, steel, copper and concrete
No solvents, no shrinkage during cure
Outstanding elongation enabling flexibility for moving and dynamic surfaces
Protects against erosion and corrosive attack
Application Areas
What this product handles, grouped by equipment area — each links to the full application.
Floor Problem Areas
4 applications- Expansion & building joint sealingSealing of leaking joints in secondary chemical containment areasLearn more
- Casting & repair of gasket sealsCreation or casting of gasket sealsLearn more
- Cold-applied rubber repairCold-curing alternative to vulcanized rubber repair of rubber liningsLearn more
- SF6 gas leak sealingSealing SF6 gas leaks providing environmental protectionLearn more
Technical Data
Mechanical Properties (ASTM D412 Die C)
- Tensile Strength (24 hr cure)
- 900 psi / 6.20 MPa
- Tensile Strength (7 day cure)
- 1500 psi / 10.34 MPa
- Tensile Modulus (7 day cure)
- 55 psi / 0.38 MPa
- Elongation (24 hr cure)
- 1000%
- Elongation (7 day cure)
- 1000%
- Shore A Hardness (24 hr cure)
- 69
- Shore A Hardness (7 day cure)
- 73
- Tear Strength (24 hr cure, ASTM D624)
- 190 pli / 3392 kg/m
- Tear Strength (7 day cure, ASTM D624)
- 230 pli / 4106 kg/m
- Compression Set (BS 903 part A6, 30 min recovery)
- 35%
Adhesion (ASTM D429 90° Peel, Grit Blasted Mild Steel)
- Maximum Adhesion
- 159 pli / 2839 kg/m
- Average Adhesion
- 133 pli / 2367 kg/m (Cohesive in Elastomer)
Abrasion Resistance (Taber ASTM D4060, H18, 1kg load, 7 day cure)
- Wet
- 88 mm³ loss per 1000 cycles
- Dry
- 313 mm³ loss per 1000 cycles
Expansion Joints
- Qualified as a Class 25 sealant for ±25% movement (modified ASTM C719) on concrete and steel substrates with appropriate conditioner.
Electrical Properties
- Dielectric Strength (ASTM D149)
- 6.4 kV/mm at 500 V/s
- Dielectric Constant (ASTM D150)
- 5.8 at 1.0 V and 100 Hz
- Volume Resistivity (ASTM D257)
- 8.08 × 10¹⁰ Ωcm at 500 V DC
Working Life
- At 68°F (20°C)
- 15 minutes
Curing Time
Cure times will be reduced for thicker sections and extended for thinner applications. At a thickness of approximately 0.10 in. (0.25 cm), allow to solidify for the times shown in the Belzona IFU.
At 68°F (20°C)
- 24 hour cure
- Shore A 69
- 7 day cure
- Shore A 73 (full cure)
Service Temperature Limits
Note: Surface conditioning with Belzona 2911 (Elastomer QD Conditioner) or Belzona 2921 (Elastomer GP Conditioner) is required for proper adhesion.
- Service Range
- -40°F to 150°F (-40°C to 65°C)
- Application Temperature
- 41°F-104°F (5°C-40°C)
Mixing & Application
Product PDFs
Gallery
Related Products
Need Belzona 2221 applied
on your asset?
Our Louisiana team supplies and applies it — with 24-hour support, no shutdown, no hot work.