Hoenle Adhesives Launches High-Reliability Underfill ‘Structalit® 8205’ for Miniaturized, High-Density Electronic Assemblies

June 28, 2026

Adhesives & Sealants Industry (ASI) Germany

Overview

Hoenle Adhesives has introduced Structalit® 8205, an underfill designed for modern, miniaturized, and high-density electronic assemblies, offering exceptional mechanical stability, thermal performance, and long-term reliability. This board-level underfill utilizes micronized filler technology to reduce the coefficient of thermal expansion (CTE) and improve material compatibility, thereby meeting the high-reliability demands of advanced electronic designs. This significantly enhances device lifespan and performance stability.

In Depth

Key Findings

Hoenle Adhesives has launched Structalit® 8205, a high-performance underfill, to meet the prevailing trends of miniaturization and increased density in modern electronic assemblies. This innovative board-level underfill is engineered to deliver exceptional mechanical stability, superior thermal performance, and long-term reliability. By employing micronized filler technology, it effectively reduces the coefficient of thermal expansion (CTE), thereby enhancing thermomechanical compatibility between disparate materials such as chips and substrates, and satisfying the stringent reliability demands in advanced electronic designs.

Technical Details

Structalit® 8205 is an epoxy-based material designed to fill the narrow gaps between semiconductor chips and printed circuit boards (PCBs) in packaging technologies like flip-chip and ball grid array (BGA). Its core micronized filler technology minimizes filler particle size, allowing rapid and complete penetration into even the smallest gaps, thus suppressing void formation. This filler also helps match the CTE of the underfill closely with that of the chip and substrate, minimizing thermal stress induced by temperature changes. This alleviates concentrated stress on solder bumps, significantly improving the reliability of interconnections under harsh conditions such as thermal cycling, shock, and vibration. Consequently, device operational lifespan is extended, and failure rates are reduced.

Background & Context

With the proliferation of AI, 5G communication, and IoT devices, electronic devices are becoming increasingly high-performance, compact, and dense. This trend leads to more complex semiconductor packaging, making thermomechanical stress management between the chip and substrate a critical challenge. Particularly in packages with fine-pitch connections and minute solder bumps, stress concentration due to CTE mismatch can be a primary cause of device failure. Underfills are increasingly important as indispensable materials to resolve such issues and ensure device reliability. Hoenle Adhesives’ Structalit® 8205 is a product designed to meet these cutting-edge industry requirements.

Strategic Significance & Outlook

Hoenle Adhesives’ Structalit® 8205 is set to open new avenues for the design and manufacturing of next-generation electronic devices demanding high reliability. This underfill, with its micronized filler technology and optimized CTE, is expected to play a crucial role in applications operating under harsh environments, such as high-performance computing (HPC), automotive electronics, and medical devices. The widespread adoption of this technology will lead to the supply of more robust and long-lasting electronic products, contributing to technological innovation and sustainable growth across the entire electronics industry. Hoenle Adhesives aims to continuously support the enhancement of electronic component reliability through the development of such advanced materials.

Source: https://www.adhesivesmag.com/articles/102480-hoenle-adhesives-underfill-for-electronics

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