(DE4431363-A1)      The following are claimed: (A) unsintered ceramic artefact comprising: (a) partially hydrolysed tetra-alumina and/or partially hydrolysed beta"-alumina; (b) at least one water-soluble binder; and (c) at least one water-soluble plasticiser. (B) making a ceramic slip comprising homogenising (a) an alumina component selected from particulate beta-alumina and/or particulate beta"-alumina; (b) at least one water-soluble binder; (c) at least one water-soluble plasticiser; and (d) water. (C) ceramic slips produced by process (B). (D) forming a green ceramic tape, comprising: (a) shaping a ceramic slip (as described in (C) above) by (i) casting the ceramic slip on a substrate, or (ii) extruding the ceramic slip, opt. onto a substrate; (b) drying the cast or extruded slip to form a green ceramic tape; and opt. (c) removing the resulting green tape from the substrate. (E) green ceramic tape produced by process (D). (F) release agent, for use in forming green ceramic sheets or tapes from beta-alumina based aq. slips by tape casting or extruding, comprising (a) at least one paraffin and/or at least one glycerol ester; and (b) at least one fatty acid and/or a metal or ammonium salt of a fatty acid.    USE -   The prods. (A), (C) and (E) are useful, e.g., in high temp. rechargeable electrochemical power storage cells.    ADVANTAGE -   The release agents are inexpensive, environmentally friendly compsns. offering problem-free handling.    (FR2709486-A1)      The following are claimed: (A) unsintered ceramic artefact comprising: (a) partially hydrolysed tetra-alumina and/or partially hydrolysed beta"-alumina; (b) at least one water-soluble binder; and (c) at least one water-soluble plasticiser. (B) making a ceramic slip comprising homogenising (a) an alumina component selected from particulate beta-alumina and/or particulate beta"-alumina; (b) at least one water-soluble binder; (c) at least one water-soluble plasticiser; and (d) water. (C) ceramic slips produced by process (B). (D) forming a green ceramic tape, comprising: (a) shaping a ceramic slip (as described in (C) above) by (i) casting the ceramic slip on a substrate, or (ii) extruding the ceramic slip, opt. onto a substrate; (b) drying the cast or extruded slip to form a green ceramic tape; and opt. (c) removing the resulting green tape from the substrate. (E) green ceramic tape produced by process (D). (F) release agent, for use in forming green ceramic sheets or tapes from beta-alumina based aq. slips by tape casting or extruding, comprising (a) at least one paraffin and/or at least one glycerol ester; and (b) at least one fatty acid and/or a metal or ammonium salt of a fatty acid.    USE -   The prods. (A), (C) and (E) are useful, e.g., in high temp. rechargeable electrochemical power storage cells.    ADVANTAGE -   The release agents are inexpensive, environmentally friendly compsns. offering problem-free handling.    (ZA9406771-A)      The following are claimed: (A) unsintered ceramic artefact comprising: (a) partially hydrolysed tetra-alumina and/or partially hydrolysed beta"-alumina; (b) at least one water-soluble binder; and (c) at least one water-soluble plasticiser. (B) making a ceramic slip comprising homogenising (a) an alumina component selected from particulate beta-alumina and/or particulate beta"-alumina; (b) at least one water-soluble binder; (c) at least one water-soluble plasticiser; and (d) water. (C) ceramic slips produced by process (B). (D) forming a green ceramic tape, comprising: (a) shaping a ceramic slip (as described in (C) above) by (i) casting the ceramic slip on a substrate, or (ii) extruding the ceramic slip, opt. onto a substrate; (b) drying the cast or extruded slip to form a green ceramic tape; and opt. (c) removing the resulting green tape from the substrate. (E) green ceramic tape produced by process (D). (F) release agent, for use in forming green ceramic sheets or tapes from beta-alumina based aq. slips by tape casting or extruding, comprising (a) at least one paraffin and/or at least one glycerol ester; and (b) at least one fatty acid and/or a metal or ammonium salt of a fatty acid.    USE -   The prods. (A), (C) and (E) are useful, e.g., in high temp. rechargeable electrochemical power storage cells.    ADVANTAGE -   The release agents are inexpensive, environmentally friendly compsns. offering problem-free handling.