PRODUCTION • PROCESSING • HANDLING
Fig. 2. Belzona 1212 cures rapidly even in low temperatures
or resources and can reinstate equipment for years of service. With a high level of tolerance to surface contamination and excellent adhesion to manually prepared substrates, Belzona 1212 is set to become a preferred choice for emergency repair applications. After mixing of the two components, this material will cure rapidly as low as at 5°C (41°F).
SURFACE TOLERANCE Belzona 1212 provides excellent adhesion to surfaces contaminated with an extensive range of oils and fuels. It can also be applied to damp and wet surfaces as well as underwater. When applied to contaminated ground mild steel surfaces prepared in accordance with SSPC-SP11/ISO 8501-01 St3, the material demonstrates excellent adhesion. Te image below shows the dolly pull off adhesion of the system when applied to oil contaminated, wet and underwater surfaces, tested in accordance with ASTM D4541.
Dolly pull off adhesion
Adhesive performance is maintained
on ground steel when the surface is contaminated. Fig.1. shows the tensile shear adhesion of the system when applied to both grit blasted steel, shown in blue, and ground steel as shown, in orange, when tested in accordance with ASTM D1002. Te adhesive strength of the system to ground and grit blasted steel is similar regardless of levels of immersion, contamination and surface preparation.
CURE AND RETURN TO SERVICE To minimise downtime, it is important that a repair material cures and develops mechanical strength quickly. Tis system will cure rapidly after mixing of the two components, even in low temperatures without compromising on durability or strength. At low ambient temperatures, this repair system will still exhibit the same robust, hard-wearing properties synonymous with Belzona epoxy technology. Fig.2. shows the development of adhesive strength with time at variable temperatures. To demonstrate the speed of cure
and strength of the system, following a 90 minute cure at 20°C (68°F), a 1in square bracket bonded with Belzona 1212 will be able to support a tensile load of greater than 200kg (440lbs). After a four hour cure at 20°C (68°F), the same bracket will be able to support a load of greater than 1,000kg (2,204lbs).
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Te material will continue to develop mechanical strength and once fully cured, the bracket will be able to support a load in excess of 1,800kg (3,968lbs). To cope with harsh operating conditions, the material must be strong, durable and robust, where one of the most important characteristics is compressive strength, i.e. the ability of the material to resist failure when stressed axially under compressive load. When tested in accordance with ASTM D695, the compressive strength of the ambient cured system is typically 12375 psi (85.3 MPa), highlighting its high mechanical performance. Product suppliers, applicators, end- users and owners alike have long faced the challenge of reducing the level of surface preparation without degrading performance of the repair material. To overcome this apparent disparity between levels of cleanliness and product performance, many new products are being developed. New technology in polymeric materials has led to the development of a fast cure epoxy-based product, which opens new opportunities when ideal surface preparation of the metallic substrate cannot be achieved due to lack of time or resources. Where conventional repair composites would be ineffective and perform poorly, Belzona 1212 bonds tenaciously onto steel substrates even when surface preparation is minimal or if the substrate is heavily contaminated with oil or water. Belzona 1212 provides a cost-effective repair that can reinstate equipment for years of service. l
Levente Bazsanyi is product manager at Belzona Polymerics.
www.belzona.com
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