The invention relates to a moulding tool or component therefor, with thermally conducting form walls, said form walls comprising ducting means for a flowing medium for heat introduction to and heat removal from the surface of the product to be produced with said moulding tool. The volume of the form walls of the moulding tool have cavities running therethrough, terminating in pore-like openings on the form wall surfaces. The cavities and the pore-like openings are formed by interconnected hollow elements, whereby the linked cavities have a medium flowing therethrough. The material for forming the enveloping walls of the hollow elements is formed such that the material has a low thermal conductivity and a low thermal capacity. The individual hollow elements are fixed to a body by means of gluing, soldering or sintering.