A small content of silicon may be added to the forming material to improve hetero-characteristics.

The forming material is softened at a temperature of 100°C or less, or is contracted with the lapse of time to remove the core material.

Also disclosed are a method for producing such a sheet-like forming material, and a separator for fuel cells obtained by shaping such a sheet-like forming material.

The forming material is applied to or inserted into a preformed body of tubular material, or inversely, before the body is compacted into an extrusion billet.

Alternatively, tubular material and forming material are supplied in powdered state to a mould and are jointly compacted into an extrusion billet.

There is described a method of separating excess lens forming material from a molded ophthalmic lens, in particular a contact lens.

Process for making rigid polyurethane or urethane-modified polyisocyanurate foams wherein dielectric heating is applied to the foam-forming material.

Disclosed is a sheet-like forming material which enables to obtain a thin fuel cell separator having excellent conductivity and thickness accuracy.

Afterward, a cutter (5) operates to cut off the tire forming material (S) to a length equal to the sum of the required length for joint and the overall circumferential length of the carcass.