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...type extruder must be capable of delivering homogeneous melt, at sufficient speed, to fill mould cavity before freeze-off. Mould fills under low pressure, so can be soft steel or aluminium. Backing plates on the mould are unnecessary and clamping can be by over-centre toggles, bolts or small hydraulic units. Cycle times are dictated by freeze-off behaviour of polymer, as...

...type process and in some instances has been superseded by the hot isostatic and Conform techniques. Materials: Cemented carbides are cold extruded with the addition of a suitable binder. The materials that are hot extruded in powder form include the following: SAP (sintered aluminium powder) refractory metals such as tungsten and molybdenum beryllium cermet fuel elements...

...types of nuclear reactor. Sodium salts are essential to life – ordinary table salt is sodium chloride. Potassium salts are used as fertilisers, such as potassium chloride - which used to be called chloride of potash. Potassium nitrate is one of the components of gunpowder. Potassium salts are also essential to life. Rubidium and Caesium have a number of specialist uses...