Bonding BorgWarner Friction Rings

Torque converter rebuilders have been routinely replacing friction elements in torque converters since the late 1970’s, when early on\off lockup systems became widespread. The early lockup materials were hard, paper-based materials which were bonded with a primitive adhesive. The bond process was very forgiving with that combination. Fast forward to today and the friction materials available in the aftermarket are much more sophisticated. Materials are now engineered to be more compliant and are intended to slip and/or fully lock in very exacting ways. Because of this, you need to pay close attention to your bonding practices when bonding these newer, highly engineered materials.


General Guidelines for a Good Bond

BorgWarner friction rings use a solvent-based adhesive that is activated by heat and requires a specific regimen of temperature, time and pressure to achieve the best bond possible. This applies whether you use old-school clamping fixtures in a pizza oven or have the latest purpose-built bonder with programmable digital controls. Temperature, time and pressure all work in concert together, and not having the correct parameters for just one of these variables can result in bond failures. The following general guidelines will help ensure that you are optimizing your bonding process.

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