formula: Copper oxide powder (320 mesh, calcined at 900°C for 3 hours)........4 to 4.5 Phosphoric acid-aluminium hydroxide solution......................1 Phosphoric acid - aluminum hydroxide solution preparation: In 100ml of phosphoric acid was slowly added aluminum hydroxide 5 ~ 8g, the solution was heated to 250 °C, to achieve complete transparency was glycerol. Preparation: Phosphoric acid - aluminum hydroxide solution can be dropped into the copper oxide powder, adjust the uniform can pull into more than 1cm filament can be used. When heating with glue, if the heat release assembly promotes rapid solidification of the glue, it is necessary to consider cooling and cooling. The amount of glue should not be too much. Source: 21st Century Fine Chemicals Network
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