At Ex Mente we enjoy sharing knowledge, keeping up with industry
news and showing you what we have been working on.

Read on to find out more.

Johan Zietsman


The format of the week has changed from last year to make the training more accessible and to equip attendees with the necessary knowledge and skill that will allow them to do powerful thermochemical calculations with FactSage™.

Johan Zietsman


We are looking forward to exploring, discovering, and learning together as part of our drive to empower teams in our industry. In the past, we hosted Thermo Week, during which we focused on thermochemistry. Pyro Week has a broader scope, to address more of the needs that we have identified in our pyrometallurgy community.

Johan Zietsman


We are grateful to welcome Charlotte Hollenbach to our management team from 1 February 2022. You are already making a difference since you have joined, Charlotte, and it is great to have you in our team. We look forward to making a real difference together into the future. A warm welcome to Ex Mente.

Heine Weitz


We are excited to welcome Nico van Hoepen to the Ex Mente team. We are grateful to have you in the team and look forward to many fulfilling years of working and learning together, Nico.

Nicole Sweeten


ThermoWeek was back this year after taking a break last year due to the lockdown situation in South Africa. We planned on having a hybrid...

Nicole Sweeten


I was privileged to attend the 22nd GTT User's Meeting these past two days. Due to international lockdowns, the conference was made virtual, so I was able to join from the comfort of my home.

Johan Zietsman


I've been using LaTeX since 2013 now, and I still love it. It creates amazingly high-quality documents. The one irritating thing is the large number of files that the LaTeX compiler generates in the root directory of the document. How can I get rid of them?!

Ruan Theron


We took a bit of a breather last year, but in 2019 openSim is back! It will be our 5th symposium since starting at the University of Pretoria in 2014.

Ruan Theron


It is with great excitement that Ex Mente announces the official release of ChemAppPy version 1.3.0 for Windows and Linux. The Light version of ChemAppPy is freely available for download here. For more information on ChemAppPy Development (the commercial version of ChemAppPy) please email us at

Johan Zietsman


When you perform an equilibrium calculation, ChemAppPy will return the result as an object containing all the values from the calculation. You can inspect the values like you would with any regular Python object. But what if you performed multiple equilibrium calculations over a range of variables? How would you then easily inspect that results that would now be spread among multiple result objects?

Andrea Steyn


We are excited to announce that a ChemAppPy training course will be held in June 2019 right before the annual GTT Users' Meeting! The 1.5-day course will start in the morning of the 25th of June 2019 and will be facilitated by Andrea Steyn from Ex Mente. The course will take place in the same venue as the Users' Meeting in Herzogenrath, Germany.

Johan Zietsman


It has previously been observed that industrial high-titania slags display a compositional invariance, remaining close to stoichiometric M3O5. The present study focuses on this invariance and the phenomena which may cause it. The invariance was studied using thermochemical calculations and a mechanism is proposed for the observed behaviour.

Johan Zietsman


The SGTE casebook is a valuable reference for those manufacturing steels and other materials, those using materials in high-temperature applications such as the power industry and in other areas such as microelectronics and lighting.

Johan Zietsman


It is with great excitement that Ex Mente announces the official release of ChemAppPy version 1.0.0 for Windows and Linux. The Light version of ChemAppPy is freely available on our website.

Dr Jaco Swanepoel


Jaco is a Chemical Engineer with twelve years of experience in projects that range from reactive metals handling, reactive metal powder production in molten salt slurry reactors, extractive metallurgy to microwave-assisted gas-solid materials processing.
Jaco contributed to three process patents and obtained a PhD degree in Chemical Engineering. Jaco also completed the KTP Management and Leadership Study Program at Ashorne Hill Management College, England.

Stefan van der Merwe


Stefan’s greatest passion is to enable people. By combining his greatest passion with his love for technology, he finds joy in making computing infrastructure accessible to the non-technical, and developing software that uncomplicates tasks. As a software engineer with qualifications in electronic engineering and bioengineering, Stefan is responsible for software development, enabling the team and clients to advance through insight.