NOVELTY - The method for manufacturing a molded article from a mold comprising an internal cavity including compartments and a removable part present within the internal cavity, comprises preparing a mold, completely filling the compartments with a hardenable liquid composition by chemical reaction to form cured organic or inorganic material, curing the composition within the mold, removing the removable part from the mold, drying the composition within the mold, and closing the mold with a sealing material capable of allowing the removal of gas from the drying step.    USE - The method is useful for manufacturing a molded article (claimed), which is useful for detecting gas and for forming an electromagnetic waveguide sensor, a dye laser, a microchannel, a microcolumn of a gas chromatographic device, a microporous membrane of a microchannel device, a microreactor, a Fresnel lens, a waveguide, an electrode material for a fuel cell and a ultracapacitor and a microstructured insulating material, piezoelectric material or dielectric material.    ADVANTAGE - The molded article has an accurate dimension, excellent surface quality and high detection sensitivity.    DETAILED DESCRIPTION - The method for manufacturing a molded article from a mold comprising an internal cavity including compartments and a removable part present within the internal cavity, comprises preparing a mold, completely filling the compartments with a hardenable liquid composition by chemical reaction to form cured organic or inorganic material, curing the composition within the mold, removing the removable part from the mold, drying the composition within the mold, and closing the mold with a sealing material capable of allowing the removal of gas from the drying step. The articles are made of the cured organic or inorganic material. The compartments have a shape corresponding to that of the object. The composition comprises a solvent. The mold is a closed chamber whose walls form boundary between interior and exterior side of the internal cavity. The walls are made of an elastomer material, which allows the removal of gas from the drying step. The removing step is carried out with a guide, which allows the movement of removable part in a single direction, to avoid all random movements, which degrade the physical integrity of the cured material. The removable parts are made of a sacrificial material. The composition is: a polymerizable and/or crosslinkable organic composition in which the organic material to be hardened is a polymeric organic material; and a composition comprising a sol-gel in which the inorganic material to be hardened is a sol-gel material.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic three-dimensional view of a molded article.    Solid rod (39)    Full ring. (41, 43, 45)