Pipes made from sandwich wall composites such as glass reinforced epoxy (GRE) can be simulated in Ple4Win as well. The program can perform material linear calculations with anisotropic material properties. With this kind of materials, the program can distinguish between the material stiffness modulus in longitudinal and circumferential direction and can distinguish between normal and bending stressing. Also, the Poisson ratio may be differentiated from axial to circumferential stressing and vice versa.