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Barrikade is a highly porous composite material, consisting of exfoliated vermiculite particles held together in an open structure with a silicate-based binder. It is fire-resistant and is being developed for a range of applications where this and its inherent low density are of importance. The linear thermal expansivity (alpha) of the material has been measured, using a bi-material beam method and dilatometry. The expansion coefficients of the composite constituents have also been measured, and these data are used in a simple analytical model of the composite thermal expansion. The stiffness of Barrikade and its constituents has been measured using a cantilever beam method, nanoindentation and deformation by a flat plate on a nanoindenter for the more compliant specimens. There is good agreement between the two techniques used for alpha measurements, and these are comparable to the results generated by the model, although this also predicts some unrealistic behaviour.