ZL5 is a pressure die casting zinc base alloy which conforms to BS EN 1774 and is one of a family of versatile high grade zinc alloys manufactured by Brock Metal.
ZL5 is generally used for castings that require moderately higher strength and hardness and where dimensional stability is not an important criterion in the product application. ZL5 is often specified for automotive applications in Europe. The alloy contains Copper as specified element, this promotes marginally better casting properties than the ZL3 alloy and improves mechanical properties. The nominal 1% makes the alloy more expensive and therefore its use should be restricted to applications requiring its higher properties. ZL5 will accept any finish specified for ZL3.
When designing a stressed component using ZL5 further reference should be made to the alloys properties, at elevated temperatures, after natural or artificial ageing and the alloys creep properties.