Water-cooled, copper-alloy plunger tips are used to push molten zinc and aluminium through a polished steel sleeve into die cavities to form intricate parts.

The inside diameter of the steel sleeve and the outside diameter of the plunger tip are machined and polished to very close matched tolerances with clearances of 0.05-0.13 mm.

The temperature of the molten metal, as it is poured into the sleeve, ranges from 480 – 815°C so the plunger tip must be cooled to prevent degradation of the tip, a process greatly assisted by the high thermal conductivity and uniform structure of AMPCOLOY® materials.

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