A melt-moldable, thermoplastic norbornene resin composition characterized by being obtained by compounding a base polymer comprising a thermoplastic norbornene resin with an olefin compound having a number-average molecular weight of 200 to 10,000 and a softening point of 70 to 170 C. According to the invention, the appliance essentially consists in a portable structure comprising a head containing at least one chamber, a body including at least handle means making it possible, during the brewing cycle, to place the outflow orifice facing down towards a cup. which can be added to a porous building material. The control circuit 180 includes first and second P-type transistors 182 and 184 formed in a floating N-type well. The resulting component surface has fewer and smaller pores or surface voids making a component failure due to stress cracking less likely.