Specimens where the amount of PCL initially infiltrated in the specimens is the same (4×4wt.% PCL vs 2×8wt.% PCL and 2×4wt.% PCL vs 1×8wt.% PCL) exhibited a comparable measured organic content and porosity. We did not investigate infitrations with more concentrated polymer solutions, as the increase of the viscosity with the PCL concentration became problematic. A more viscous solution is more difficult to deposit homogeneously and thus creates clogged pores, as reported by Peroglio et al. in porous biphasic calcium phosphates processed by organic burn-out and similar PCL infiltration conditions. Our results are also in agreement with the optimal conditions determined by Flauder et al. , who selected 4wt.% as the optimal PCL concentration in acetone for infiltration. Although this choice was not justified by the authors, it is likely related to the same infiltration constraints. Despite the solvent in both studies being different, a too high polymer concentration is deleterious for this infiltration approach.