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ARALDITE 2028-1 Polyurethane Adhesive for Clear Structural Bonding

ARALDITE 2028-1 Polyurethane Adhesive is a transparent, two-component structural bonding system developed for fast assembly of metal, plastic, glass, composite, and painted components. The cold-curing polyurethane chemistry combines rapid handling strength with a clear bond line, making it especially useful where appearance and production speed are both important. Its UV-stable formulation supports exposed and illuminated assemblies such as automotive headlamps, LED housings, reflectors, signboards, traffic lights, and exterior components.

The adhesive is supplied as separate resin and hardener components and uses a simple 1:1 ratio by weight or volume. After complete mixing, the material has a typical pot life of approximately six minutes, while a static mixer provides an application window of about six to eight minutes. This fast process helps reduce fixture time and supports efficient manual, cartridge-based, or robotic dispensing. Both components and the mixed adhesive are transparent, with a typical mixed density of approximately 1.12 g/cm³.

Key Benefits of ARALDITE 2028-1 Polyurethane Adhesive

ARALDITE 2028-1 Polyurethane Adhesive offers a valuable combination of fast curing, UV stability, flexibility, and broad material compatibility. Huntsman lists a typical room-temperature lap-shear strength above 8 MPa. The cured material also provides a typical tensile strength of approximately 11 MPa, elongation at break of about 60%, and roller-peel strength near 6.6 N/mm on prepared aluminum. These characteristics help the bond tolerate vibration, impact, thermal movement, and differences in expansion between dissimilar substrates.

At approximately 23°C, the adhesive can reach a minimum lap-shear strength of 1 MPa in about 30 minutes and 10 MPa in roughly eight hours under the published test conditions. Higher curing temperatures can accelerate strength development when the bonded materials allow controlled heating. The adhesive also demonstrates useful resistance to thermal cycling, humid environments, water, fuels, lubricating oils, and selected chemicals when the joint has been correctly designed, prepared, and cured.

Applications for ARALDITE 2028-1 Polyurethane Adhesive

ARALDITE 2028-1 Polyurethane Adhesive is suitable for automotive lighting, LED lamps, traffic-signal housings, reflectors, railway interiors, signboards, outdoor assemblies, and industrial components. Compatible substrates include aluminum, mild steel, stainless steel, galvanized steel, copper, brass, glass, wood, ABS, PVC, PMMA, polycarbonate, polyamide, GRP, CFRP, SMC, and selected painted surfaces.

Because surface grades, coatings, plastic additives, and service conditions can affect adhesion, representative testing should be completed before mass production. Users should verify bond strength, optical appearance, UV exposure, temperature cycling, moisture resistance, chemical compatibility, and the required disassembly method on actual components.

How to Apply ARALDITE 2028-1 Polyurethane Adhesive

Before applying ARALDITE 2028-1 Polyurethane Adhesive, clean both surfaces with a suitable degreasing agent to remove oil, grease, dust, moisture, and processing residue. Plastics may be cleaned with compatible isopropanol, while metal preparation may include abrasion or chemical pretreatment followed by a second cleaning step. Avoid low-grade alcohol, gasoline, and paint thinner because they may leave contamination.

Mix equal parts of resin and hardener until the material is completely homogeneous, or use the approved dual cartridge and static mixer. Apply the adhesive promptly to the prepared surfaces. A bond-line thickness of approximately 0.05 to 0.10 mm normally provides high lap-shear performance. Assemble and secure the components immediately, then maintain alignment until sufficient handling strength develops.

Storage and Safety of ARALDITE 2028-1 Polyurethane Adhesive

Store ARALDITE 2028-1 Polyurethane Adhesive in sealed original containers in a dry location away from direct sunlight. The referenced technical data sheet states a storage range of 2°C to 40°C and a shelf life of three years from manufacture under those conditions. Review the current safety data sheets for both components, use suitable workplace ventilation and protective equipment, and clean dispensing tools before adhesive residue cures.

For buyers requiring a clear, fast-curing adhesive for visible multi-material assemblies, ARALDITE 2028-1 Polyurethane Adhesive provides professional processing, durable flexibility, UV stability, and reliable structural bonding. It is a strong choice for automotive lighting, signs, transportation components, outdoor equipment, and precision industrial production.

industrial polyurethane adhesives