Araldite 420 A/B Structural Adhesive: A Professional Solution for High-Toughness and High-Strength Multi-Substrate Bondi

Araldite 420 A/B is a two-component room temperature curing epoxy structural adhesive launched by Huntsman. It features ultra-high lap shear strength, excellent peel performance, and high toughness and elasticity, and is suitable for bonding a variety of substrates including metals, composites, thermoplastics and ceramics. Stable bonding can be achieved with room temperature curing, and the comprehensive performance can be further improved with post-curing at elevated temperature. With good moisture resistance and medium resistance, the product is widely used in aerospace, high-end equipment manufacturing, composite material processing, automotive industry and other fields with strict requirements for bonding strength and durability, and is a highly reliable bonding choice in industrial production and precision processing.

• Combination of ultra-high strength and high toughness: After curing, the product has extremely high lap shear strength and peel strength. After sandblasting pretreatment of metals such as aluminum alloy, carbon steel and stainless steel, the lap shear performance of metal-to-metal bonding is excellent; at the same time, the adhesive layer has outstanding toughness and good elasticity, which can effectively absorb vibration and impact loads, adapt to bonding scenarios with dynamic stress requirements, and avoid joint failure due to brittle fracture.
• Multi-substrate compatibility, worry-free cross-material bonding: It can realize efficient bonding between different materials such as metals, carbon fiber reinforced plastics (CFRP), glass fiber reinforced plastics (GRP), thermoplastics and ceramics, and performs particularly well in the high-strength bonding of carbon fiber/glass fiber composites, which greatly reduces the process difficulty of multi-material assembly and adapts to the bonding requirements of complex structural parts.
• Flexible curing, balancing efficiency and performance: It supports room temperature (23℃) curing, reaching a shear strength of 1N/mm² in 7.5 hours and a high shear strength of 10N/mm² in 11 hours without additional heating equipment, meeting the needs of on-site rapid construction; it can also further improve performance through post-curing at elevated temperature (40℃/60℃/100℃), and only 20 minutes at 100℃ to reach a shear strength of 10N/mm², adapting to the high-efficiency curing requirements of industrial large-scale production.
• Excellent environmental resistance, strong bonding durability: It has good moisture resistance and can maintain stable bonding strength after long-term immersion in 23℃ water environment; it also has good resistance to commonly used industrial media such as unleaded fuel, lubricating oil and xylene, and the adhesive layer can still maintain considerable shear strength after 90 days of immersion in various media, adapting to complex industrial use environments.
• High operational adaptability and strong process controllability: The two components A and B are mixed at a weight ratio of 100:40 or a volume ratio of 100:50, and the pot life of 100g adhesive at 25℃ is 60 minutes, reserving sufficient operation time for manual gluing and mechanical dispensing; the best lap shear strength can be achieved when the adhesive layer thickness is controlled at 0.05-0.10mm, and curing can be completed with only uniform contact pressure after gluing, with easy process control and high yield.

• Aerospace composite material processing: As a special adhesive for bonding carbon fiber/glass fiber composite materials and metal connectors, it is used for the bonding and assembly of composite structural parts, UAV frames and aviation accessories in the aerospace field. Its high shear strength and high compatibility with composites can ensure the overall stability of the composite structure, and the toughness of the adhesive layer can also adapt to the complex stress environment of aerospace equipment.
• High-end equipment and precision machinery manufacturing: Used for bonding metal structural parts and composite parts of high-end equipment such as CNC machine tools, precision testing equipment and industrial robots, such as bonding of carbon fiber parts of robot arms and metal joints, fixing of precision guide rails of machine tools, etc. The high-precision bonding characteristics and vibration resistance of the product can ensure the operation accuracy and service life of the equipment.
• Automotive industry core component production: Suitable for automotive lightweight modification, bonding of new energy vehicle body structural parts and chassis parts, such as splicing of aluminum alloy body frames, bonding of carbon fiber body trim parts and metal substrates. The room temperature rapid curing characteristic meets the high-efficiency construction requirements of the automobile production line, and the fuel and lubricating oil resistance characteristics adapt to the complex medium environment inside the automobile.
• New energy equipment assembly: Used for bonding composite materials and metal parts of wind turbine blades and photovoltaic supports, as well as bonding structural parts of energy storage equipment shells. Good moisture resistance and weather resistance can adapt to the outdoor use environment of wind power and photovoltaic equipment, and the high-toughness adhesive layer can absorb the vibration load of wind turbine blades and improve the long-term operation stability of the equipment.
• General industrial maintenance and precision processing: Used for damage repair of industrial equipment, such as repair of cast iron part cracks, bonding and fixing of stainless steel equipment accessories, and assembly of ceramic parts and metal parts of precision instruments. The convenient operation characteristic is suitable for rapid construction of on-site maintenance, and the high-strength bonding can ensure the use performance of the equipment after repair.

The bonding effect of Araldite 420 A/B is highly related to surface pretreatment and gluing operation. Following the standardized process can give full play to its high-strength bonding characteristics: first, clean the bonding surface with special degreasing agents such as acetone and isopropanol (special for plastics/composites) to completely remove oil, dust and impurities, and it is strictly forbidden to use non-special reagents such as low-grade alcohol, gasoline and paint thinners to avoid affecting the bonding force between the adhesive layer and the substrate; for metal substrates, further treatment can be carried out by mechanical grinding or chemical etching, and secondary degreasing is required after grinding to improve surface adhesion.
Fully mix components A and B according to the ratio until uniform and colorless (dark green after mixing), apply the adhesive to the dry pretreated surface with the adhesive layer thickness controlled at 0.05-0.10mm; assemble the bonded parts immediately after gluing and apply uniform contact pressure to ensure the adhesive layer is fully attached to the substrate until the specified curing strength is reached. Construction tools should be cleaned with hot water and soap before the adhesive layer is cured. The residual adhesive layer after curing is difficult to clean, so tool maintenance should be done in a timely manner.

Araldite 420 A/B features ultra-high strength, high toughness and elasticity, multi-substrate compatibility and flexible curing as its core characteristics, breaking the selection limitations of traditional adhesives between strength and toughness, room temperature and high temperature curing. It can not only meet the efficiency requirements of on-site rapid construction, but also achieve higher performance through post-curing, adapting to the diversified bonding needs of different industries. In aerospace, high-end equipment, automotive lightweight, new energy and other fields with strict requirements for bonding reliability, the product has become a high-quality solution in the field of industrial bonding with stable performance and professional technical endorsement of Huntsman, providing high reliability and durability guarantee for the bonding of various structural parts.