Kirksite was developed primarily as a forming tool alloy.  Dies cast from Kirksite provide low-cost tooling because the alloy can be accurately cast, requiring minimal finishing.  In addition, Kirksite has been used as a general purpose casting alloy for non-stressed components.  Typical Uses for Kirksite are:  Press dies and punches for sheet metal forming, Molds for ceramics and rubber, Injection molding and compression molding dies, tube bending dies, Mandrels for metal spinning, Low stressed - non sparking tools and repair parts. 

Because of the alloy's excellent fluidity and low melting temperature, casting temperatures are low (800-850 F).  Higher temperatures should be avoided due to possible iron contamination from the cast iron kettles normally used to melt the alloy.  Iron pickup can cause poor casting surface quality and brittleness.  Melting in a silicon carbide crucible is preferred as a safeguard against iron pickup. Kirksite is readily machined and polished.  Castings can be successfully plated following procedures used for zinc die-castings.  Kirksite can also be cast in rubber tooling as a replacement for slush casting alloy (ZA-5) when higher strengths are required, with a sacrifice in fluidity.

Typical Permanent Mold Cast Mechanical Properties
UTS:  ksi (MPa)Elongation:  %Hardness:  BrinellMelting Range:  deg F (C)Density:  lb/in^3 (g/cc)Solidification Shrinkage:  in/ft
35 (310-345)2100717-745 (380-396)0.25 (6.92)0.14

Chemical Analysis (Nominal Composition)

Recommended Downloads

For additional properties of Kirksite and other zinc die casting alloys, please contact us or visit our technical library.