Key Findings
Master Bond is providing high-performance epoxy adhesive systems specifically formulated for bonding polyimide plastics to themselves and to a variety of dissimilar substrates. These adhesives are engineered to complement and maximize polyimide’s inherent strengths, including its exceptional thermal stability, high mechanical strength, low outgassing properties, and excellent electrical and thermal insulation capabilities. The product range includes notable examples like Supreme 10HT, a single-component, heat-curable epoxy approved for NASA low outgassing, and EP21LVMED, a two-part, room-temperature curing, biocompatible system, both designed to meet the rigorous demands of the semiconductor, aerospace, and medical industries.
Technical / Product Details
Polyimide is a material of choice in many high-performance applications due to its very high thermal stability (continuous use over 240°C, short-term over 400°C), excellent mechanical strength, chemical resistance, and radiation resistance. Master Bond offers epoxy adhesives that enable strong, reliable bonds without compromising these critical polyimide properties:
- Supreme 10HT: This is a single-component, heat-curable epoxy that complies with NASA’s low outgassing specifications (ASTM E595). Such compliance is crucial for vacuum environments and sealed electronic devices where volatile components must be minimized to prevent contamination (outgassing). When combined with polyimide’s heat resistance, it ensures stable bonding in high-temperature conditions.
- EP21LVMED: A two-component, room-temperature curing epoxy, EP21LVMED is distinguished by its biocompatibility (meeting ISO 10993-5 cytotoxicity and USP Class VI requirements). It offers a safe and reliable solution for bonding polyimide components in medical electronic devices or potentially implantable devices. Its low viscosity also allows for excellent penetration into narrow gaps.
- Diverse Product Portfolio: Master Bond provides a wider array of epoxy grades for applications requiring high peel strength, impact resistance, chemical resistance, or specific electrical properties (conductive or insulative). These are optimized for polyimide’s characteristics, ensuring reliability across a broad operating temperature range.
These adhesives can effectively bond various forms of polyimide materials, including films, sheets, and molded parts. They also exhibit excellent adhesion to dissimilar substrates such as aluminum, stainless steel, ceramics, and glass.
Background & Context
Polyimide, often referred to as a “super engineering plastic,” is indispensable across industries such as aerospace, defense, medical, semiconductors, and high-performance electronics due to its superior performance. It is widely used in flexible printed circuit boards (FPC), high-temperature motor insulation, medical catheters, and semiconductor packaging. However, achieving strong and reliable bonds between polyimide components or with other materials in these complex assemblies remains a persistent challenge. Adhesives themselves must meet extremely stringent performance requirements, particularly in high-temperature, vacuum, or bio-contact applications. Master Bond’s expertise lies in developing products that cater to these specific needs, thereby supporting technological innovation within these industries.
Strategic Significance & Outlook
The market for polyimide adhesives is expected to continue growing, driven by trends in electronics miniaturization, increasing operating temperatures, advancements in medical devices, and the introduction of new materials in the aerospace sector. High-performance adhesive suppliers like Master Bond will focus on developing polyimide bonding solutions with more advanced functionalities (e.g., enhanced thermal cycling resistance, flexibility, conductive pattern formation). Key areas of future R&D will likely include thermal stress management in dissimilar material joining, faster curing mechanisms, and the development of environmentally compliant products. This will further expand the design freedom and reliability of products incorporating polyimide across various application domains.
Source: https://www.masterbond.com/applications/bonding-polyimide
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