Quarzwerke GmbH HPF The Mineral Engineers

It is the absolutely unique combination of the grain shape with its rounded edges, the smooth grain surface and the high sintering point that make our silica sand from Haltern so valued, proven and simply legendary. This unique qualitative position of our H 32 allows sophisticated foundry casting of the very highest level and, last but not least, it is therefore always the first choice when it comes to high-grade foundry products.

The highest raw material quality for your production
The foundry sands from our other deposits do of course also meet the high quality requirements of our company and, needless to say, are suitable for all self-, heat- and gas-hardening processes. Our quality criteria for them are strict and ensure consistently high quality.
-high SiO2 content (> 99%)
-low annealing loss
-high drying rate
-low abrasiveness
-high temperature resistance

Being an innovation leader, we are of course continually discovering new optimization potential in our extraction and treatment processes, from which you can also benefit in your production. Speak to us about this. We'll be glad to send you further information material or advise you about our products.

Our high-grade silica sands enjoy lasting popularity particularly in the manufacture of moulds for sophisticated foundry applications. One of the reasons for this is the high raw material quality of our outstanding sands, which makes possible in the first place many modern techniques that are used in mould manufacture. Our silica sands are characterized by the following quality features:

Smooth production processes
Together with our customers we successfully pursue the objective of implementing long-term improved casting results with reduced costs for reworking and aggregates. We always achieve smooth production processes due to our proven and high-quality raw materials. We owe this degree of added value not only to our many years of experience but also to the constant optimization of our in-company processes. You can also benefit from this—it will be well worth it!

An important aspect in the foundry sector is the production of cores for casting batches. In this case too, Haltern silica sand from the Quarzwerke Group—on account of its characteristic properties—is in a masterfully unique position for the production of cores in aluminium, iron and steel foundries. Furthermore, the foundry sands from our other deposits are also of a very high raw material quality and are also highly suitable for all self-, heat- and gas-hardening processes used in the production of cores. The reason for this is our first-class quality management.

Being an innovation leader, we are of course in a position of being able to specifically control all sand parameters and to fully exploit the optimization potential. In addition, what may seem to be contrary core properties can also be positively influenced by our individualized grading curve. For example, gas permeability and bending strength can be optimized through asymmetric grain size distribution, thereby enabling attractive potential savings. We'll gladly let you also share our latest scientifically based findings.

Basic research pays off
The possibility of a customized grading curve design, particularly in combination with the already excellent quality of our primary product, creates for our customers new degrees of freedom for the implementation of their successful innovations. Extremely low fluctuation ranges in the grain-size fractions now provide for many applications a basis for defining an optimal grading curve. We'll be glad to let you also share our latest developments and we'll support you in implementing a really individual grading curve design.

You can also benefit from our first-class quality management. Speak to us about the use of our silica sands in your core production. It will be well worth it!

The shell-moulding process is not new but is imperative for many applications in the modern foundry industry. Under the brand name COMIN® the Quarzwerke Group offers coated foundry sands of proven quality that are highly suitable for the shell-moulding process. Even with complex core geometries you will be able to achieve filigree results. Proven silica sands from Gambach are processed on site for COMIN® with state-of-the-art resin systems in accordance with customized formulations. We are thus able to offer you, with assured availability and quality, a high degree of flexibility for any area of application—whether for solid cores, hollow cores or shell-moulding processes.

The advantages for you:
-Reduced reworking and costs due to the high surface quality
-Reduced finning due to low thermal expansion
-Excellent pourability for precise core fabrication
-Reduced resin requirement and odour pollution
-Also suitable for long-distance transportation

If you would want to play it safe with complex castings, speak to us about your requirements. Together, we'll find the COMIN® sand formulation that is most economical!