Share this page by mail Thermally conductive epoxy
Cotronics® Duralco® Thermally Conductive Adhesives and potting compounds provide the heat dissipation required for many High Temperature Electronic and Industrial applications. These ultra-temperature adhesives combine Cotronics®’ unique polymer system and special thermally conductive fillers to provide continuous service up to 340°C. Duralco® conductive Adhesives have excellent adhesion to glass, ceramics, metals and plastics. Resistant to most chemicals and solvents.
Thermally conductive Epoxy Applications
Removing the heat generated in many electronic applications including semi-conductors, rectifiers, high power devices, etc.
Heat transfer applications, including bonding copper coils to reaction vessels for heating and or cooling. Heat tracing adhesive, etc.
Fabrication of heated, plastic forming tools, melds, etc.
260°C - Duralco® 128
Hi-electrically Resistant Ceramic based Epoxy Ω.cm
Duralco® 128 is highly thermally conductive, electrically resistant adhesive and potting compound. The ceramic fillers are carefully chosen to provide high thermal conductivity and high dielectric strength. Just mix the resin and hardener, apply and cure at room temp. Curing may be accelerated with mild heat.
260°C - Duralco® 132
Hi-thermal Conductive Aluminium based Epoxy
Duralco® 132 is an Aluminium Metal Filled Epoxy that cures at room temperature to form machinable, thermally conductive bond lines. Duralco® provides the maximum heat transfer available in a 260°C epoxy system. Can be supplied as a non-sag putty, Duralco® 132P, for heat tracing applications.
260°C - Duralco® 133
High-temperature Aluminium based Epoxy
Duralco® 133 is a two component, heat curing, Aluminium Filled, Conductive Epoxy. Duralco® 133 combines the excellent properties of Duralco® 132 with Cotronics®’ higher temperature epoxy systems making it suitable for applications requiring up to 315°C service. Cures with mild heat to form thermally conductive bond lines and heat transfer medium. Duralco® 133 is suitable for high temperature tooling. It is readily machinable and ideal for all kinds of repairs and as a construction material.
260°C - Duralco® 134
Electrically Resistant Grease Ceramic based Epoxy
Duralco® 134 thermally conductive grease, is a non-hardening, electrically insulating and thermally conductive grease. It is ideal for use between components and heat sinks. Duralco® 134 retains its paste like consistency, enabling parts to be easily removed and replaced. Will not dry out even after long periods of time. Usable to 260°C.
260°C - Duralco® 135
Thermally Conductive Grease Aluminium based Epoxy
Duralco® 134 is filled with an ultra-fine, aluminium metal powder to provide the maximum possible heat transfer rate in a non-hardening grease. Used in delicate military applications where excess heat build-up can cause serious failures. Duralco® 135 is commonly used in many industrial applications where electrical resistance is not critical.
Why should you prepare your surfaces ahead of bonding?
The best way to ensure a long-lasting adhesive bond is to properly clean the parts before bonding them together. Our partner Bostik has developed a range of solutions under the Born2Bond™ brand specifically designed to cover all the different steps of the surface preparation process. These solutions are also recommended for adhesive bonding applications using Cotronics® products:
Duralco® 132 Adhesive epoxy
Duralco® 133 Adhesive epoxy
Duralco® 134 Thermal Grease
Duralco® 135 Thermal Grease
Duralco® 128 Adhesive epoxy
FAQs that can help you in this category
The choice depends mainly on the temperature and the mechanical stresses. Final Advanced Materials' high-temperature epoxy resins are generally limited to between 150 and 350°C, with satisfactory mechanical resistance (typical sheer-stress 10–30 MPa) and a degree of elasticity. However, the ceramic cements produced by Final Advanced Materials can be used up to 2,200°C, depending on the grade (alumina, zirconia, silicate, silica). They have excellent temperature resistance, but remain fragile (brittle behaviour, no elasticity). In the case of assemblies subject to differential expansion or vibration, epoxy is by far the preferred solution, if permitted by the maximum temperature of the application. However, in the case of extreme environments (kiln, vacuum, reducing atmosphere) which exceed 350°C, ceramic cement must be chosen.
The ceramic cements distributed by Final Advanced Materials have maximum working temperatures ranging between 650°C and 2,200°C. For example, alumina-based formulations often reach 1,650–1,760°C in an oxidising atmosphere. However, silicate systems are limited to around 1,000–1,200°C. The real maximum working temperature depends greatly on the environment (air, vacuum, inert gas), the time of exposure to this temperature and the thermal cycle (gradient, thermal shock). Specifically: the metal-loaded ceramic adhesives produced by Final Advanced Materials resist only up to the maximum temperature of the filler (650°C, for example, in the case of aluminium powder).
Ceramic/metal assemblies require often very different coefficients of thermal expansion (CTE) to be controlled. Final Advanced Materials recommends alumina-, silica- or zirconia-based ceramic cements for temperatures >350°C, which can bond to all types of ceramics and, generally, metals. For intermediate applications (≤350°C), an epoxy resin loaded with alumina powder enables thermal stresses to be absorbed and will be very compatible with different expansion coefficients. The thickness of the bond line must be between 100 and 300 µm to limit stress. Surface pre-treatment (sanding, degreasing, etc.) greatly improves adherence and is absolutely necessary if the CETs are very different.
The Cotronics adhesives distributed by Final Advanced Materials have variable cycles.
In the case of a cement, initial drying at ambient temperature takes between 2 to 24 h, depending on the viscosity and thickness. A thermal aftertreatment can be performed to allow them to attain their optimum properties after firing. Excessively rapid drying can lead to cracking or porosity in the cement.
Final Advanced Materials' epoxy adhesives which resist up to 260°C must be cured at ambient temperature. Epoxy adhesives which resist up to over 300°C require heat curing.