ZL5 is a zinc base pressure die casting alloy

ZL5 conforms to EN 1774 1997 Ingot Specification and is one of a family of versatile high-grade zinc alloys we can manufacture in.


ZL5 is generally used for castings produced on a hot chamber pressure die casting machine where a slightly stronger and harder alloy than ZL3 is required and dimensional stability in the as cast condition is not such an important criterion. ZL5 has slightly better cast ability than ZL3 and therefore tends to be used for small intricate castings or when surface preparation of a ZL3 casting is difficult, prior to electroplating. Due to its higher Copper content the alloy is more expensive than ZL3 therefore it’s application should be restricted to its correct use. ZL5 is easily machined, buffed, polished, lacquered and electroplated for decorative or functional purposes

National Specifications

The composition of ZL5 conforms to the current EN 1774 Standard, which is now common to all EU countries. When designing a stressed component using ZL5 further reference should be made to the alloy’s properties, at elevated temperatures, after natural or artificial ageing and the alloys creep properties.

Aluminimum 3.8% 4.2%
Copper 0.7% 1.1
Magnesium 0.035% 0.06%
Iron - 0.020%
Copper - 0.03
Lead - 0.003%
Cadmium - 0.003%
Tin - 0.001%
Nickel - 0.001%
Silicon - 0.02%


    Pressure Die Casting
Casting Temperature °C 405-425
Freezing Range °C 379-388
Specific Heat J/GK 0.4187
- (0.10)


Cm/m 1.17
(in/ft) (0.14)
Casting Shrinkage Mm/mm 0.006
(in/in) (0.006)
Thermal Conductivity at 18 °c W/m°C 108.9
(C.G.S) (0.26)
Thermal Expansion Linear

 per °c

- 28x10₆
    Pressure Diecasting
Electrical Conductivity

At 20°C



Specific Gravity - 6.7
Density Kg/m₃ 6700
(ib/in₃) (0.24)
Tensile Strength at 20°c N/mm² 228-270
(ib/in²) (47000)
Elongation at 20°C %in 2in 7-13%
Impact strength at 20°C

(unnotched samples)





Hardness BHN 92-80

Figures relate to material in casting form. Properties vary for different processes. Further data available on request.