The electronics industry, as a vital driving force behind social progress and economic development, has become a key sector for future growth in many countries. Currently, electronic products are increasingly evolving toward lightweight designs, multifunctionality, and higher performance. As important auxiliary materials in electronic products, adhesives have a wide range of applications. In addition to traditional functions such as sealing, bonding, potting, and coating, electronic adhesives also provide specialized functions, including electrical conductivity, thermal conductivity, insulation, dielectric properties, water and dust resistance, corrosion resistance, flame retardancy, and optical performance.

Below, we introduce several common types of electronic adhesives.

SMT/SMD/SMC Electronic Adhesives

Also known as surface-mount red adhesives, these materials are low-temperature-curing modified epoxy adhesives. They can form strong adhesion between various materials within a short period of time, while offering excellent performance, good storage stability, and ease of use. They are widely used for heat-sensitive electronic components that require low-temperature curing.

Depending on their specific properties, different types of SMT adhesives are suitable for various application processes. SMT adhesives with high shear-thinning viscosity are suitable for ultra-high-speed dispensing equipment, while adhesives with optimized viscosity and good vibration resistance are suitable for stencil or screen-printing processes because they effectively prevent adhesive overflow on PCB boards.

COB/COG/COF Electronic Adhesives

Also known as dam or dike fillers, COB/COG/COF electronic adhesives are high-quality, single-component epoxy encapsulation materials. They feature excellent solderability, moisture resistance, temperature cycling performance, and flowability. Their low coefficient of thermal expansion helps reduce deformation, making them suitable for electronic products such as LCD displays, PDAs, and calculators.

After curing, these adhesives exhibit excellent properties, including low shrinkage, low moisture absorption, flame retardancy, and good bending resistance. Therefore, they are particularly suitable for IC bonding and protective encapsulation applications.

MC/CA/LE/EP Encapsulation Materials

Commonly known as conductive silver paste, MC/CA/LE/EP encapsulation materials are single-component, thermosetting epoxy adhesives characterized by high purity, low electrical resistance, and low modulus. They are used for the conductive bonding of electronic components and chip attachment applications. In some cases, they can partially replace traditional conductive connection methods such as silver sintering, soldering, and wire bonding.

BGA/CSP/WLP Electronic Adhesives

Commonly known as underfill materials, BGA/CSP/WLP electronic adhesives are primarily used for underfilling CSP or BGA components. The resulting underfill layer effectively reduces the mismatch in thermal expansion between the chip and the substrate.

Underfill adhesives feature fast curing speeds, low viscosity, and excellent flowability at room temperature. They are suitable for filling and protecting CSP components with small gaps or no visible gaps, while also allowing easier rework. Their excellent resistance to mechanical stress and aging provides reliable protection for BGA and CSP components and meets the requirements of automated production processes.

Potting Compounds

Potting compounds are typically liquid before curing and possess excellent flowability. After curing, they provide moisture resistance, waterproofing, and corrosion protection, thereby improving product reliability, stability, and service life.

Based on their chemical composition, electronic potting compounds can be classified into epoxy potting compounds, silicone potting compounds, and polyurethane potting compounds. Depending on application requirements and product characteristics, they can be applied manually or through automated equipment. They are widely used for encapsulating electronic components, modules, transformers, power supplies, sensors, and other electronic devices.

Thermally Conductive Adhesives

Thermally conductive adhesives are specially designed for heat transfer across gaps. They fill the spaces between heat-generating and heat-dissipating components, improving thermal management while also providing electrical insulation, shock absorption, and sealing functions.

They are commonly used in electronic components with high heat generation and strict thermal management requirements, including transformers, transistors, and CPU chips.

Future Development Trends of Electronic Adhesives

With the increasingly widespread application of electronic adhesives, the performance requirements for these materials are becoming more stringent. Future electronic adhesives will need to provide increasingly diverse and multifunctional properties.

For example, conductive adhesives can simultaneously provide mechanical bonding and electrical conductivity, eliminating the need for separate bonding and electrical connection processes. This trend represents an important direction in the advancement of electronic adhesive technology. It not only promotes innovation within the adhesive industry but also creates new challenges for material development and application.