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ZL27 High Pressure Alloy

PMS Diecasting can supply high pressure ZL27 diecastings for automotive applications. The exceptional properties of ZL27 allow products such as bearings and bushes to be manufactured to compete with traditional brass and bronze bearings and wear parts.

ZL27 is the alloy of choice for wear and hardness properties.  Originally a sand and gravity cast alloy it is also high pressure cast using cold chamber diecasting machines.  PMS has now developed the ability to high pressure diecast using hot chamber machines traditionally used for zinc diecasting.  The means product quality is the same but the cost of processing much reduced.  We now offer very competitively prices for bearing parts, bushes and seal rings manufactured in high voulme.

Zinc Alloy ZA27 – ZL27 is a zinc alloy containing 27% aluminium. It has exceptionally high strength and excellent bearing properties. Originally this alloy was envisaged for use in the sand and gravity diecasting industries but, has subsequently found a niche market as a pressure diecasting alloy using cold chamber diecasting machines. ZL27 offers the extended tool life applicable to zinc alloys which, when combined with its higher strength and hardness makes the alloy an automatic choice when aluminium alloys are unable to meet the service conditions anticipated.

When designing a stressed component using ZL27 further reference should be made to the alloys properties, at elevated temperatures, after natural or artificial ageing and the alloys creep properties.

Alloy DesignationZnAL27Cu2Colour codeWhite + Violet
Short designationZL 27Alloy Number.ZL2720


Supplied in diecast form.As CastAged
Tensile strength426 MPa360 MPa
Yield strength371 MPa317 MPa
Impact strength5 Joules2.2 Joules
Elongation 50mm2.5%3%
Shear strength296 MPa234 MPa
Compressive yield strength385 MPa288 MPa
Fatigue Strength145 MPa
Hardness BHN 500Kg122 max100 max


Melting range376 – 484 deg C
Density5.0 g / cm 3
Coefficient of Thermal expansion26 um/m deg C
Thermal Conductivity125.5 W/m deg C
Electrical Conductivity29.7 % IACS
Electrical Resistivity5.8 u ohm-cm at 20 deg C

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