High Temperature Organic Adhesive Bonding Films

Large computers and high-speed, high-clock-rate electronic devices generate large amounts of heat that must be efficiently dissipated for proper functioning of the device. Examples are telecom systems, automotive, computer, and power supply, military and motor control systems. Instead of dissipating the heat via additional components such as cooling surfaces, we offer an elegant internal solution to the problem: we make the PCB itself thermally conductive. The heat from the components is dissipated via a heat-conductive bonding film onto the aluminum or copper layers below, from where it is radiated. The heat is extracted through thermal vias, which are thermally and/or electrically connected to the metal layers. New manufacturing technologies at On Time Circuits Inc. include making PCBs with customer specific heat management requirements using On Time Circuits Inc.’s proprietary high temperature organic adhesives based thermally and/or electrically conducting bonding films to suit customer specific thickness and conductivity criteria. In addition we can also use commercially available bonding materials. We can custom make copper-dielectric-copper clads to make circuits and then bond with aluminum heat sink using thermally and/or electrically conducting bonding films. We are patenting these technologies. You can order high cooling performance compact-design circuits from us! These films are used in-house to tailor laminates of heat sink materials. Depending on the PCB application, we can custom design the film composition and thickness of bonding films between copper-copper and ground copper and aluminum layers. The main use of these materials is to make printed circuits that can electrically isolate power sources from heat sinks. Applications include Power supplies, automotive electronics such as LEDs, Motor controls, and Power semiconductors. These circuits can withstand temperatures much higher than PCBs made with epoxy based films. Our films are non-toxic, flame retardant and resistant to most of the chemicals. All our Thermasil products are UL approved for commercial applications.

For help in thermal management please refer to our technical articles.

Solderlink Technology

The Solderlink operation for applications using lead-free sweat solder takes nearly 25% of the bonding manufacturing space. High temperature solder pastes are routinely used to bond circuit board with heat sink. With this unique technology your bonded pcbs will not delaminate during subsequent SMT reflow.


  • Mixed dielectric multilayer
  • Pure PTFE multilayer
  • Exotic material multilayer
  • Blind & Buried vias
  • Metal core and metal backed
  • Embedded resistors and capacitors (R&D stage)

Bonding Capability

On Time Circuits Inc. has developed proprietary bonding technology to bond heat sink with RF circuit to produce fully bonded layers with no resin bleed. Using newly developed press profile and book construction, parts are made in large volume with excellent quality. In the RF Division, there are four programmed 4-opening electric heat hydraulic presses with two-4 opening cool down stations. A fifth vacuum assist hydraulic press will soon be on-line for bonding applications requiring vacuum.

On Time Circuits Inc. has pioneered a unique way to integrate heat sink technology into plated carrier designs. This approach increases the efficiency of heat sinks and ultimately reduces the junction temperature of electronic components. It has the capability to bond PCB’s with several mediums including various types of “thermally and electrically conductive” or “thermally conductive and electrically insulating” adhesives and lead-free sweat soldering. We specialize in bonding PCBs to Aluminum, Brass, Copper, etc. for various applications. The thermal and electrical conductivity and adhesive thickness and mechanical characteristics can be tailored to customer specific requirements.