Sound velocity measurements carried out between 10 and 300 K in a Pd85Pt15 single crystal at 0 and 0.29 H contents for five different propagation modes, have shown that C', C44 and CT are strongly decreased by H loading (CT=1/3(C11-C12+C44). Smaller relative changes are observed for longitudinal modes. The bulk modulus as well as the anisotropy factor turn out to be increased by H impurities. The Debye temperature at absolute zero is found to be 271±5 K for n=0 and 264 ±5 K for n=0.29.
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