Araldite AW4859/HW4859 Epoxy Paste with 25 MPa Shear Strength

Araldite AW4859/HW4859 is a high-performance two-component epoxy adhesive designed for structural applications. It consists of resin AW4859 and hardener HW4859, offering exceptional lap shear strength and toughness for bonding various substrates such as metals, composites, and thermoplastics. The product features a pot life of 100-120 minutes at 25°C for easy handling, with performance enhanced by post-curing. Key attributes include temperature resistance up to 140°C and built-in spacers to guarantee a minimum bond line thickness of 0.05 mm.

The product's special properties deepen its parametric performance: First, its lap shear strength exceeds 25 MPa at 23°C, ensuring structural bonding reliability. The chart provided in the document displays average shear strength data for metal-to-metal joints under various conditions, such as after curing at 40°C for 16 hours plus 80°C for 1 hour, tested at 23°C. This data, derived from ISO 4587 standard tests, highlights the product's excellence in standard environments.

Second, built-in spacers guarantee a minimum bond line thickness of 0.05 mm, optimizing bond strength and preventing failures from excessive thinness or thickness. Shear strength peaks at bond lines of 0.05 to 0.10 mm. Additionally, temperature resistance up to 140°C makes it suitable for high-temperature applications. Mechanical properties like flexural strength and modulus (based on ISO 178) are also outstanding, as shown in the image below, reflecting typical values at 23°C.

Pretreatment requires rigorous degreasing and mechanical abrasion for durability. The mix ratio is 100:43 by weight (AW4859:HW4859) or 100:50 by volume, with thorough blending needed for homogeneity.

Based on document data and same-model product information, Araldite AW4859/HW4859 is widely used in industrial sectors demanding high strength, temperature resistance, and reliability. In automotive manufacturing, it bonds carbon fiber-reinforced plastic (CFRP) body parts to metal frames for weight reduction and crash performance enhancement (e.g., in electric vehicle battery packs). In aerospace, it is common for bonding composite aircraft wings and engine components, benefiting from 140°C temperature resistance to ensure stability at high altitudes. Additionally, in electronics, it bonds thermoplastic enclosures to metal heat sinks, providing impact resistance and thermal management. Other scenarios include wind turbine blade bonding and sports equipment (e.g., bicycle frames), where minimum bond thickness and toughness prevent fatigue failure. Tropical weathering test data from the document (e.g., lap shear strength versus weathering) supports outdoor durability applications.