How to Select Inductor Fixing Adhesives: Fluidity, Thixotropy and Temperature Resistance Must Be Considered Simultaneously

Inductors, coils and magnetic cores are key components in power modules, filters, automotive electronic control units, communication equipment and industrial control systems. During transportation vibration, equipment operation and temperature cycling, inductors may shift, and magnetic cores can become loose due to mechanical shock. Solder joints bear sustained loads from component weight and vibration, which easily leads to fatigue cracking. Applying fixing adhesives to structurally reinforce inductor bases, magnetic cores and coils can share stress on solder joints and improve long-term reliability. I. Three Core Considerations for Selecting Inductor Fixing Adhesives Can the adhesive stay in the designated area? Inductors are usually surrounded by pads, pins and other components. Adhesives with excessive fluidity tend to flow and contaminate restricted zones. For local fixation, high-thixotropy paste materials are recommended. If penetration into bottom gaps is required, moderate fluidity is necessary. Can the cured adhesive withstand vibration? Materials must deliver sufficient shear strength and hardness to prevent inductor displacement under mechanical vibration. Can the adhesive withstand operating temperatures? Inductors can experience significant temperature rise during operation. The glass transition temperature (Tg) and service temperature range of the fixing adhesive must cover actual working conditions. II. Elaplus Recommended Products for Inductor Fixation EP 2011: Two-Part Epoxy Structural Adhesive EP 2011 is a grey two-part epoxy paste with slight sagging tendency. Key Properties: ■ Hardness: approx. Shore D 83 ■ Tg: approx. 55°C ■ Shear strength: approx. 16 MPa ■ Service temperature: -40 ~ 120°C ■ Suitable for large-area base bonding and room-temperature mixing processes Recommended Applications: ■ Inductor base bonding ■ Fixation of coils and brackets ■ Structural bonding for general industrial electronic components EP 1769: High-Thixotropy One-Part Epoxy Adhesive EP 1769 is a grey paste one-part epoxy; viscosity approx. 300,000 cps; thixotropy index approx. 4.5. Key Properties: ■ Hardness: approx. Shore D 80 ■ Tg: approx. 140°C ■ Shear strength: approx. 28 MPa ■ Service temperature:…