Belzona 1981
SuperWrap II Low Temperature Resin
Low temperature fast curing resin for SuperWrap II composite repairs in cold environments down to 41°F.
A 2-part fast-curing low-temperature resin for SuperWrap II composite repairs, applicable down to 41°F (5°C).
- SeriesBelzona 1900 Series
- Approvals2
- Documents6
Overview of Belzona 1981
A two-component low temperature, fast curing resin system for use with Belzona 9381 reinforcing fabric in the SuperWrap II composite repair system. Belzona 1981 can be applied at temperatures as low as 41°F (5°C), making it ideal for cold-environment field repairs. Service temperatures up to 140°F (60°C).
The SuperWrap II composite repair system is suitable for thin-wall and through-wall defects on Class 1 water systems, Class 2 safety critical systems, Class 3 hydrocarbon systems and storage tank walls. It complies with ASME PCC-2 Article 4.1 and ISO 24817.
Key Benefits
Rapid return to service after application
Excellent resistance to a wide range of chemicals including aqueous solutions, hydrocarbons, and process chemicals
Easy to mix and apply without specialist tools
100% solids formulation reduces health and safety risks in confined spaces with no shrinkage on cure
Bonds tenaciously even when surface preparation is minimal or substrate is contaminated
Application Areas
What this product handles, grouped by equipment area — each links to the full application.
Valves, Pipes & Fittings
3 applicationsTechnical Data
Mechanical Properties (Composite with Belzona 9381)
- Tensile Strength (0° hoop)
- 75,980 psi (524 MPa)
- Tensile Strength (90° axial)
- 18,270 psi (126 MPa)
- Young's Modulus (0° hoop)
- 5.626 × 10⁶ psi (38,800 MPa)
- Young's Modulus (90° axial)
- 2.654 × 10⁶ psi (18,300 MPa)
- Flexural Strength (0° hoop)
- 95,480 psi (658 MPa)
- Flexural Strength (90° axial)
- 24,050 psi (166 MPa)
- Strain to Failure (0° hoop)
- 1.37%
- Strain to Failure (90° axial)
- 0.81%
- Shore D Hardness
- 90
Adhesion
- Pull-Off Adhesion (68°F cure)
- 5,520 psi (38.1 MPa)
- Tensile Shear (68°F)
- 2,241 psi (15.5 MPa)
- Tensile Shear (post-immersion 1000h, 140°F cure/test)
- 2,293 psi (15.8 MPa)
Glass Transition Temperature
- 41°F (5°C) cure
- 102°F (39°C)
- 68°F (20°C) cure
- 127°F (53°C)
- 140°F (60°C) cure
- 194°F (90°C)
Gas Permeability
- Carbon Dioxide (5.4mm thickness)
- 6.7 ml/m²/atm/day
Working Life
- 68°F (20°C)
- 18 minutes
Time to Peak Exotherm
- 68°F (20°C)
- 12–26 minutes
Peak Exotherm Temperature
Cure times will vary depending on ambient conditions; consult the Belzona IFU for specific details.
- 392–446°F (200–230°C)
Service Temperature Limits
- Lower temperature limit
- -60°C (-76°F) once cured
- Upper service temperature
- 60°C (140°F)
- Minimum application temperature
- 5°C (41°F)
- Maximum application temperature
- Avoid above 20°C (68°F) due to reactive nature
Mixing & Application
Certifications & Approvals
Product PDFs
Gallery
Frequently Asked Questions
What is Belzona 1981 used for?
Belzona 1981 is a 2-part low temperature, fast curing resin used with Belzona 9381 reinforcing fabric in the SuperWrap II composite repair system. It is designed for cold-environment field repairs of pipelines, pipework, tank walls, support pads, and pressure vessels at temperatures as low as 41°F (5°C).
What approvals does Belzona 1981 hold?
Belzona 1981 is pre-qualified to ASME PCC-2 Article 4.1 and ISO 24817, the international standards for non-metallic repair systems on pressure equipment. It is suitable for Class 1 water systems, Class 2 safety critical systems, and Class 3 hydrocarbon systems.
Can Belzona 1981 be used at low temperatures?
Yes. Belzona 1981 is specifically engineered for cold-weather application, with a minimum application temperature of 41°F (5°C). Its fast-cure chemistry enables rapid return-to-service, making it ideal for emergency repairs in cold environments.
Related Products
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