Mouldable compositions comprising a metallic powder or a combination thereof with ceramic powder, mixed with an organic binder are disclosed, at least a part of which binder comprises a synthetic resin component (A) having a heat deformation temperature of 130°C or higher. The component A may be used in combination with another component (B) having a melting point of 30°C - 100°C, with or without another thermoplastic component (C), having a heat deformation temperature of 130°C or less. Mouldable compositions, comprising metallic and/or ceramic powder mixed with an organic binder comprising a secondary or tertiary amine (D), or a combination thereof with a thermoplastic resin (E), are also disclosed.