Patent ID: 7815774

Claim:
An element made by papermaking for use in the production of a cast, which comprises: an organic fiber; a carbon fiber; and at least-two binders existing among the individual fibers, wherein the organic fiber content is 10 to 60 parts by weight, the carbon fiber content is 4 to 40 parts by weight, and the at least two binders content is 10 to 85 parts by weight each per 100 parts by weight of the total of the organic fiber, the carbon fiber, and the at least two binders, the carbon fiber has an average length of 0.5 to 10 mm, the element is hollow, the element has no joint seams, the element contains a flow passage for molten metal, the element has both an inlet and an outlet through which a fluid can flow, the outlet being separated from the inlet, and the at least two binders comprise an organic binder and an inorganic binder.