Synthetics Diamonds


Our Zamak Alloy can be divided in two main groups:




(For centrifugal casting)

We have created a new type of tonsul / kayem alloy for centrifugal casting with rubber molds, Zamak Rolled, to increase its quality. This alloy, while maintaining the basic elements, is produced with a new type of machining and consequent change in its physical form.

The new ingots are made in continuous casting, rolling. This type of workmanship drastically reduces the usual impurities of traditional ingots, leaving them upstream, allowing us to obtain significant benefits in refining, for the realization of your productions.

The main features that qualitatively and technically differentiate this product are:

- Improvement of finished pieces making simpler treatments later;

- no porosity on finished pieces;

- Significant drop in castings (foams).

All this starting from Zinc and Primary Copper.

We also wanted to keep the weight of the laminated ingot, realizing it as follows:

About 40 cm long, about 10 cm wide and about 0.5 cm thick, for a total weight of about 3 / 3.5 kg.

The small weight of the ingot allows us to avoid, once immersed in the crucible, that there is, as with the traditional ingots of about 10 kg, a sudden drop in temperature. This allows to maintain a constant temperature of the melted alloy in the crucible, resulting in improved performance of the centrifuge and constant yielding in the production.

In addition to this size, it facilitates the operator or operator, which must feed the ingot vessel with the ingots during machining.

Another advantage not to be underestimated is the storage, since the parcels, weighing approximately 500 kg, occupy a space less than square meters, allowing them to store, overlaying, up to 5 tonnes in height.



The term “die-casting”refers to the casting metal under pressure process, that makes alloy be casted into a mold.

high fluidity of this kind of alloys and the low melting point permit to obtain pieces with narrow tolerance limits and very elaborate shapes, which are not obtainable with any other alloy with high melting point. For the most part of industrial applications it isn’t not important the quality choice of the alloy, because the physical and mechanical characteristics differ little. The choice becomes important when the application justifies the research of a specific property.
This kind of die-casted alloys differs from other for the larger or shorter quantity of Copper and Magnesium they contain.

Our product summary table:

Type Elem. Al Cu Mg Cr Ti Pb Cd Sn Fe Ni Si Zn
ZL3 min. 3,8 0,04 Rest
max. 4,2 0,03 0,06 0,003 0,003 0,001 0,020 0,001 0,02  
ZL5 min. 3,8 0,7 0,04 Rest
max. 4,2 1,1 0,06 0,003 0,003 0,001 0,020 0,001 0,02  
ZL2 min. 3,8 2,7 0,04 Rest
max. 4,2 3,3 0,06 0,003 0,003 0,001 0,020 0,001 0,02  
ZL6 min. 5,6 1,2   Rest
max. 6,0 1,6 0,01 0,003 0,003 0,001 0,020 0,02  
ZL8 min. 8,2 0,9 0,02 Rest
max. 8,8 1,3 0,03 0,005 0,005 0,002 0,035 0,04  
ZL12 min. 10,8 0,5 0,02 0,001 Rest
max. 11,5 1,2 0,03 0,005 0,005 0,002 0,050 0,05  
ZL27 min. 25,5 2,0 0,01 Rest
max. 28,0 2,5 0,02 0,005 0,005 0,002 0,070 0,07  
ZL16 min. 0,01 1,0 0,1 0,2 Rest
max. 0,04 1,5 0,02 0,2 0,3 0,005 0,004 0,003 0,040 0,07  

Each of our products observe the EN 1774 standards.


This kind of alloy, which differs from “die-casting Zama” alloys for its high content of Magnesium, is mainly  used for centrifuge fusion processes.

Other alloys are available on request.  Please contact us:


As told before, Zamak is an alloy of Zinc with diferent levels of:

Alluminium Copper Magnesiium

ZAMAK structure is composed by crystals rich of Zinc, which give to the alloy the characteristics of a “stringy” material.
Zamak characteristics are the result of many years careful researches and studies, whose purpose are to obtain the best characteristics,
for many applications, andd to determine the optimal resistance of each composition and to fix the limits of  impurity admissibility.

This table shows the advantages of the presence of the three metal aforesaid:


Increase the flowingness into the mold
Improve the resistance


Increase the hardness and the breaking load

Increase the solubility


Increase the resistance to traction
Refining of the crystal grain


On the contrary, metals like Lead, Cadmium and Tin increase the risks  for Zinc-Alluminium alloys to intercrystal corrosion even at very low standards, beacause they are little soluble and tend to settle on the crystal surface.
ZAMAK application fields are extremely different: car industry,  hardware item production,  metal trinklets  for clothing, furnishing, decoration, construction and modelling, etc.
One of the main reasons that makes this alloy widely used is, for instance, the low melting point (380° for die-coating alloys annd 500° for those with high content od Allumium).

On the other hand there are some limitation of Zamak alloy, that restrict their applications:

Weak resistance to the corrosion.

They are prone to get polluted by a simple contact with other kind of common alloys, as Brass or Bronze, because they absorb small quantities of Tin or Lead.

Limited resistance to heat.





We are at your disposal for any information you would like

Phone : +39 02 90003777   -   Fax : +39 02 90003787   -   E-mail :

Quality Certification




  COMETOX   s.r.l.

Via XX Settembre 9
20080 Zibido san Giacomo  MI - ITALY
Phone :
+39 02 90003777
Fax :
+39 02 90003787 

E-mail :