Abstract
The phase diagram and the critical behaviour of an (intersecting) random surface gas model in three dimensions is studied by means of Monte Carlo simulations. The critical exponents alpha , beta , gamma and delta are evaluated in the 'critical window' between the finite-size rounding and the correction-to-scaling regime. Within error bars, Ising exponents for the self-avoiding case (and along critical lines) and mean-field behaviour at tricritical points are obtained. For the self-avoiding planar surface model the Hausdorff dimension is calculated (dH=2.30+or-0.05).