What Is T260 in PCB?
T260 (Time to delamination) is the time it takes for the PCB base material to delaminate when subjected to a temperature of 260°C through the use of a thermomechanical analyzer (TMA). The delamination refers to the separation of layers from one another – e.g., of a resin from a laminate or of fibers from a resin. Such processes cause defects in printed circuit boards (PCBs).
PCB T260, T288 Time to Delamination
T260 and T288 vs. Td and Tg
The decomposition temperature (Td) of a resin system depends on the binding energies within the polymers, and not on the glass transition temperature (Tg). A good indicator for this characteristic is the T260 or T288 value, which specifies the time until delamination at 260°C or 288°C, respectively. A very important indicator of the heat resistance is the time-to-delamination at a certain temperature. This test is preferably performed at 260 °C or 288 °C. The T260- or T288-value is the time to delamination of the tested material at 260 °C or 288 °C, respectively.