Summary. Actively cooled Beryllium Monoblocks brazed to a copper heat sink have been exposed to power densities of 20 - 25 MW/m2 for up to 9 seconds. The beryllium, molten during exposure, stays on the tiles forming a smooth meniscus. The estimated melt depth is up to 3.5 mm. The uncastellated tiles showed deep cracks after approximately 30 pulses with surface melting. The castellated tiles sustained in excess of 100 similar pulses without visible cracking. Surface temperature and sublimation rate achieve equilibrium 3.5 seconds after the start of exposure for the uncastellated tiles. The castellated tiles, optimised to reduce thermal stress, have higher surface temperatures due to a lack of conducting cross section.