Mask Aligner Oriel Mask Aligner Click here for brief instructions Practice Tips: • Regarding exposure times for curing SU-8 features on silicon wafers, we have found it is necessary to triple the exposure energies recommended on Microchem’s SU-8 data sheets. • It is important to periodically check the UV power output (using a dosimeter) because the strength can vary substantially over the bulb’s lifetime.  The exposure times should be adjusted accordingly.