Current methods for testing liquids in a shock tube have limitations when studying high-viscosity, low-vapor pressure fuels. A new method developed by the TEES Turbomachinery Laboratory at Texas A&M University uses a novel injection method to introduce the fuel ahead of the incident wave. In the present study, a hydroxyl-terminated polybutadiene (HTPB) and dioctyl adipate (DOA) mixture was tested due to the broad interest of HTPB from the propellant community as a reliable and effective binder and fuel. An 80/20 mixture of HTPB and DOA (by mass) was tested at post-reflected shock pressures of ~ 3 and 5 atm at an equivalence ratio near 1. Combustion was observed at temperatures between 1160 and 1283 K using OH* chemiluminescence located at the sidewall of the shock tube. Overall, the new method allowed for characterization of the ignition delay times of the HTPB/DOA mixture, resulting in an Arrhenius correlation for both pressures.