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Thermal Properties of Adhesive Systems

Kohesi Bond develops a broad range of products with an array of thermal properties. They vary in their serviceable temperature range, thermal conductance, coefficients of thermal expansion, curing exotherm and resistance to thermal cycling. Our custom made thermal adhesives, sealants, coatings, potting and encapsulation compounds can be formulated to meet more than one of the aforementioned properties in your application. In addition, our products are capable of passing a number of industrial certifications, such as NASA low outgassing (ASTM E-595), USP Class VI and UL 94V-0 flame retardance, among others.
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Thermal conductivity refers to a material’s ability to conduct heat. Kohesi Bond’s thermally conductive epoxies provide phenomenal heat dissipation properties. These first-rate heat transfer materials are widely used in a variety of industrial applications, especially in the electronic industry. Some of the applications include heat sink bonding, power semiconductor devices, BGA die attachment using a heat spreader, potting and encapsulation of sensors and chip-scale packages (CSP). Our thermally conductive epoxy adhesives, polyimides and sodium silicates offer serviceability at extremely low and high temperatures, superior mechanical strength, dimensional stability, chemical resistance, and electrical insulation.
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Thermal insulation refers to a material’s ability to inhibit heat transfer. Constraining transfer of heat becomes crucial in many industrial applications. Epoxies are inherently poor conductors of heat. Kohesi Bond’s thermally insulative epoxy systems offer outstanding bond strength, dimensional stability, chemical and corrosion resistance and thermal stability. These 100% solids systems are commonly used for bonding and coating in many processing equipments, electronic devices and appliances, industrial ovens and pipes, among many others.
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Kohesi Bond custom formulates specialty epoxy systems that are capable of withstanding cryogenic temperatures and shocks. Cryogenic temperatures are typically referred to temperatures below -180°C (93.15K). Our cryogenic adhesives, sealants and coatings are capable of withstanding temperatures down to 4K. These unique low-temperature resistant adhesives are commonly used in sensors, cryosurgery or cryotherapy, satellites, energy storage, high energy physics, nuclear magnetic resonance spectroscopy (NMR), magnetic resonance imaging (MRI), cryogenic transfer pumps and valves, blood banking and superconductivity applications. Distinct grades are available that offer electrical conductivity, thermal conductivity, optical clarity, electrical insulation and are capable of meeting stringent industrial certifications.
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Kohesi Bond offers a broad range of out of the ordinary epoxies and sodium silicate based products that can withstand extremely high temperatures. These high temperature adhesives, sealants, coatings, potting and encapsulation compounds are capable of holding up to temperatures more than 315°C (600°F). Our products, including high-temperature epoxy adhesives, are commonly employed in various oil and gas, electronics, medical, aerospace, automotive and optical applications, where good adhesion even at extreme temperatures is absolutely crucial. Depending on your application requirements, our adhesives can be customized to precisely suit them.
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Glass transition temperature (Tg) is one of the most essential properties of an epoxy adhesive. Epoxies are thermosetting materials and they do not melt when subjected to high temperatures. However, they tend to soften beyond a certain temperature. This point where it transitions from a hard material to a soft, rubbery material is known as the glass transition temperature (Tg). Kohesi Bond custom formulates specialty high glass transition temperature (Tg) epoxy compounds. Our unique adhesives, sealants and coatings can offer a Tg of more that 220°C. High Tg materials are crucial in applications requiring high bond strength, chemical resistance and other performance properties even at elevated temperatures.
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The curing process of an epoxy system is an exothermic reaction, resulting in generation of heat. The amount of heat generated varies with the type of resin-curing agent and filler used. It also depends on the thickness and volume of mixed epoxy being cured at a time. Kohesi Bond has developed exclusive low exothermic epoxies that can be used for large potting, encapsulation and conformal coating applications. These specialty systems offer stress-free cures even in thick sections. Our products can be customized to meet various viscosities and working life requirements. Some applications require low viscosity coupled with low exotherm for large volume potting and casting applications, where the epoxy needs to flow through intricate shapes and crevices. High viscosity, low exotherm systems are employed for gap filling and bonding of vertical heat sensitive surfaces. Based on your application, our low exothermic epoxy systems can be fitted to meet diverse performance specifications.
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Coefficient of thermal expansion (CTE) characterizes the fractional change in a material’s size with change in temperature. Highly sensitive optical, aerospace, electronics, semiconductor and specialty OEM applications desire this change in size to be minimal. With the help of special fillers, Kohesi Bond has formulated first-rate epoxy adhesives, sealants and coatings with extremely low coefficients of thermal expansion. Our Low CTE epoxies are capable of passing stringent industrial certifications such as NASA standards for low outgassing (ASTM E-595). These dimensionally stable products offer low shrinkage, outstanding electrical insulation, superior thermal conductivity and phenomenal low and high temperature resistance. Our adhesives can be tailor-fitted to your specific application requirements.
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Thermal cycling refers to exposing a material to an alternate heating and cooling cycle for a specified period of time. The rate at which the temperature is increased or decreased is known as the ramp speed. The amount of time for which the material is exposed to specific temperatures, is known as the dwell time. The choice of the adhesive would vary depending on the ramp speeds, dwell times and the number of thermal cycles it is going to be exposed to. If the change in temperature is instantaneous, it is known as a thermal shock. Kohesi Bond specializes in manufacturing special epoxy adhesives, sealants, coatings, potting and encapsulation compounds that are capable of holding up to multiple thermal cycles and severe thermal shocks even at cryogenic temperatures. These compounds are designed to adhere well to similar as well as dissimilar substrates and provide excellent toughness. They protect against cracking and delamination at high as well as low temperatures. Typical applications include heat exchangers, sensitive semiconductor devices, electronics, launch vehicles, combustion engines, LEDs, sensors, transformers, aerospace and aircraft components.
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