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Abtract: We construct orientifolds of type IIB strings with O-planes which do not couple to the gravitational sector. We construct a model of this type with a supersymmetry breaking deformation in nine dimensions. The model has potentially a strong-weak coupling S-duality symmetry. The construction has some similarities with a supersymmetric nine-dimensional orientifold that lacks an open sector. We construct the D-branes of the new non-supersymmetric orientifold, which provide some support for the S-selfduality, and stress similarities with those of the supersymmetric one.