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electrical properties of adhesives

Electrical Properties of Adhesive Systems

Kohesi Bond offers superior adhesives, sealants, coatings, potting and encapsulation compounds specifically for use in semiconductor packaging and assembly of electronics such as printed circuit boards. These products offer outstanding electrical properties and can be customized to fit various conductivity, insulation, volume resistivity and dielectric strength requirements. Our industry-ready systems are widely used in conformal coating, die-attach, EMI & RFI shielding, glob top, underfill, surface mount, wire bonding and various other applications.
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Kohesi Bond formulates and manufactures first-rate electrically insulative adhesives that meet specific industrial requirements. Electrical insulation refers to a material’s ability to prohibit easy flow of electric current. Epoxies are inherently phenomenal electrical insulators. Varying the type of filler and the resin-curing agent system used, electrical properties of the end product can be drastically changed. Our extensive range of insulative products offer extremely high volume resistivity and dielectric strength. At the same time, these systems also offer very low dissipation factor and dielectric constant. These products are commonly used for attaching SMDs, ferrite bonding, glob top, coil impregnation, underfilling flip-chips and potting applications.
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Kohesi Bond offers a comprehensive range of custom-made electrically conductive epoxy, polyimide and sodium silicate systems that suit your specific requirements. Electrical conductivity refers to a material’s ability to easily allow flow of electrical current. Various fillers are employed to make our epoxy systems excellent conductors of electricity. These include: Silver Filled Adhesives: Silver filled systems offer the highest electrical conductivity and the lowest volume resistivity of <10-3 ohm-cm. They are commonly used to replace solder. Silver-coated Nickel Adhesives: Silver-coated nickel filled products offer a more cost effective alternative to silver filled systems, while maintaining very low volume resistivity of < 0.005 ohm-cm. Nickel Filled Adhesives: Nickel filled systems offer a cost effective solution where high electrical conductivity is required. Typically, they offer a low volume resistivity of 5 – 10 ohm-cm. Graphite Filled Adhesives: Graphite filled products offer an economical solution while maintaining good electrical conductivity. They provide a non-magnetic bond, high lubricity and a volume resistivity of 50 – 100 ohm-cm. Kohesi Bond’s superior electrically conductive adhesives, sealants and coatings are extensively used for wire-bonding, die attach, EMI/RFI shielding, electrostatic discharge, grounding and antistatic applications. Kohesi Bond offers a premium range of custom-engineered adhesive systems with insulative and conductive properties. If you are looking for high-performance adhesives designed to work in the electronic and electrical industry, contact our technical team today.
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FAQs:

An electrically conductive epoxy is a specialty epoxy adhesive containing high purity metal fillers that allow the adhesive to conduct electricity. Both, one and two component epoxy adhesives  are capable of conducting electricity while maintaining a strong bond between two surfaces.

Electrically conductive epoxies are widely used in applications requiring electrical conductivity for the purpose of making an electrical connection, EMI/RFI shielding or grounding. Electrically conductive epoxies are typically employed in various electronic and electrical components and semiconductor chips across aerospace, defence, medical, space, optical, electronic, automotive, and specialty OEM industries. 

The thermal resistance of electrically conductive epoxy may vary depending on the epoxy formulation and the manufacturer. Kohesi Bond’s electrically conductive epoxy adhesives can withstand temperatures from 4K (-269.15°C) up to  340°C (640°F). Since these materials have good thermal cycling stability, they can withstand repeated exposure to high temperatures without degradation.

Electrically conductive epoxy can be applied manually or by using a dispensing equipment for precise application of the adhesive. Kohesi Bond offers a wide range of packaging options which include standard containers, syringes and cartridges simplifying the application process for electrically conductive epoxies.

The conductivity of an electrically conductive epoxy can vary depending on the specific formulation and the concentration of conductive filler that is used. In general, electrically conductive epoxies have a conductivity range of < 0.001 ohm-cm to 100 ohm-cm, with some custom-engineered epoxy formulations offering even higher conductivity.

The conductivity of an epoxy typically remains stable over its lifetime. However, extreme environmental ageing can affect its performance properties, including conductivity. The ageing process that affects the electrical conductivity of the adhesive includes oxidation, hydrolysis, thermal degradation, exposure to UV radiation and other environmental factors  beyond the recommended exposure levels. An affected joint can see a change in conductivity levels. 
Hence, it is imperative to choose an epoxy system that is custom-made for the specific application and to follow the manufacturer’s recommendations for application, curing, and storage.  Kohesi Bond is leading provider of custom-formulated conductive adhesives for electronics systems.

Electrical insulating epoxy is a type of epoxy system that has high resistance to electrical conductivity and is formulated to insulate electrical components or systems from electric current.

Electrical insulating epoxy can be  specifically designed to have a high glass transition temperature which provides good thermal stability to withstand repeated exposure to high temperatures without degradation. Alternatively, we also manufacture exclusive products that can withstand extremely low cryogenic temperatures down to 4K.

Generally, electrical insulating epoxies are designed to have a high volume resistivity to provide effective electrical insulation, but it can vary depending on specific formulation of the material and the conditions under which it is tested. Typically volume resistivity of an insulating epoxy is > 10e14 ohm-cm at 23°C.

Generally, for an insulating epoxy product the dielectric strength is > 420 volts/ mil at 23°C at ⅛” thickness. For thinner sections the dielectric strength can be much higher > 2000 volts/mil.

Yes, electrically insulating epoxies can be formulated to offer high thermally conductivity. Typical applications include thermal interface materials, heat sink compounds, thermally conductive potting compounds or thermally conductive adhesives.If you are looking for epoxy adhesive or epoxy coating for electrical insulation, reach out to us. . Our technical experts can help you find the right thermally conductive epoxy that offers electrical insulation.

Electrically insulating epoxies can be either hard or soft based on their formulation and intended use. Some are designed to be hard, making them ideal for applications where epoxy needs to provide structural support.  Others are designed to be soft, making them ideal for applications where epoxy needs to withstand mechanical stress without cracking.