Topas GmbH
Gasanstaltstraße 47
D-01237 Dresden

Tel:     +49 (351) 2166 430
Fax:    +49 (351) 2166 4355

Write us a message

Your name (required)

Your email (required)

Your company (required)

Your phone number

Your address (required)

Your country


Serial number

Your message

It is important for us to know how you heard about TOPAS.

Topas has built up an international network of distributors to ensure local customer guidance and service. I agree that my data will be forwarded to the appropriate distributor/representative in my country. (Please specify country)

I have read and understood the Privacy and agree to them.

I have read and understood the General Terms and I agree to them.



The change into the new year also means a change at the top management of Topas. Dr.-Ing. Andreas Rudolph, co-founder and managing director of the engineering company Topas GmbH hands over the management to Dr.-Ing. Claudia Jahn-Wolf and dedicates his energy and creativity to the department of Research & Development from now on. The graduate engineer in the field of mechanical engineering and construction technology has many years of management experience and can already look back on 12 exciting months at Topas. The Topas staff expresses their best wishes to both of them for much success and satisfaction with their new tasks. To all friends of the brand the entire staff wishes health, energy and a lot of creativity for the year ahead!

In addition to smear and droplet infection, aerosol transmission is also a key contributor to the spread of the SARS-CoV-2 virus. Topas supported the Gesellschaft für Aerosolforschung GAeF in their preparation of a position paper that emphatically shows possible transmission paths from the perspective of aerosol research. Here, experts explain in a comprehensible way how, for example, viruses escape or comment on the effectiveness of masks. In the official media, both terms and aerosol-physical phenomena are mixed and thus partly incorrectly communicated. The position paper aims to counteract this and is a research-based contribution to the management of the current pandemic. Its authors, including Christof Asbach, Andreas Held, Birgit Wehner and Sebastian Schmitt, call for greater cooperation between all scientific disciplines to explain different transmission pathways and to draft appropriate measures to stop them. You can already find the English version at

How quickly a year goes by is particularly noticeable in our growing workforce: in the past 12 months, 25 new employees have started work at our new headquarters at Gasanstaltstraße 47 nearby the well-known Panometer Dresden. Thanks to the expanded production capacities and the 37% increase in staff, we were able to develop new products such as the Laser Aerosol Spectrometer LAP 323, the Fractional Efficiency Measurement System FMS 375 or the Gas Turbine Filter Test System GTS 114 and to support our customers in meeting their challenges with new technologies like the Dual Wavelength Technology. More space for deployment, tinkering and development also helped us to make our contribution to contain the COVID-19 pandemic. For example, by participating in accompanying basic research or by supporting medical technology in the field of surgical experiments. By the way, with the construction of our second building, we are meeting the current requirements for environmentally friendly and energy-optimized construction. We would like to thank all those who supported us during the complex construction phase and remained loyal to us during these first 365 days as both long-standing and new customers and business partners.

The holiday season 2020 looks a little different for everyone. For Topas as well: we have continued to win new staff for our production and have introduced a two-shift system for the first time.

Our variety of series devices was also improved. On the one hand, the FMS 375 was introduced to the market: The fractional efficiency measurement system bundles core competences of Topas in one compact and robust instrument for highlyresolved aerosol analyses regarding particle size and concentration. On the other hand with the new single particle scattering light spectrometer LAP 323 the innovative dual wavelength technology of Topas GmbH for particle size and number determination is implemented.

New experiences are also waiting for us in the future. From 31.08. – 04.09.2020 Topas will be represented at the first online conference. At the EAC (European Aerosol Conference) Topas will present itself with a virtual booth. Via a chat function the exchange between visitors and our technical experts is possible. We are already looking forward to the feedback.

In the last few weeks most of us have fortunately returned to everyday life a little bit. Many positive things have happened with TOPAS since then, and we would like to keep you posted on the latest developments.

Despite the corona crisis, we have hired many new employees and are proud that our team has grown by 8% since the beginning of the year.  In May, TOPAS was awarded the German research seal “INNOVATIVE THROUGH RESEARCH” by the Stifterverband Wissenschaftsstatistik on behalf of the Federal Ministry of Education and Research (BMBF), which we are very pleased about. Now that overseas deliveries are possible again, we were finally able to supply our customers from China with their ordered filter test systems ALF 114 and AFS 150 in June. In the past months we have been working together with many innovative companies and research institutions to find solutions concerning the corona crisis and are pleased about the partnerships that have been established and the results achieved. Research activities with artificial saliva or the support of a surgical team in detecting the leakage of dangerous bioaerosols during laparoscopic operations are only two examples. We are particularly pleased about the market launch of the new Variable Dilution System VDS 562, which is currently delivered to the first customers in Switzerland, Romania and Germany. It has been developed to reduce highly concentrated aerosols to an analytically suitable concentration level in a single device without external clean air supply and almost without pressure loss. Last but not least, we received a quite extraordinary offer for one of our first innovations, the Atomizer Aerosol Generator ATM 225: Our customer ibs tecnomara had left us his still fully functional model from 1995 for our company archive. We are happy about this nice proof of the durability of our products and thank you for this offering.

With all this good news from our company we wish you, your colleagues and your families best health and a pleasant holiday season 2020.


Dear business partners and friends. First of all we hope all of you are doing well in this completely new critical global situation due to Covid-19.
Current situation for Germany: companies are open, but shutdown of schools and almost all public life.

Current situation for Topas: production is going on and we are able to receive and deliver equipments to customers. This is not affected by current border closing. For most of our standard products our standard delivery times can be assured. Filter test systems are quoted with standard delivery times as well. In some single cases or for certain projects delivery delays will have to be considered due to relevant engineering or production people have to stay at home indefinitely. These delays will be communicated individually.

Email and phone availability is assured by Topas headquarter as well as colleagues working from homeoffice. For the time being any company visits or test system installations will have to be postponed.

We are wishing good health to you, your colleagues and your families.

We are happy to announce that our latest image brochure has been translated to Chinese中國, Korean 한국의, Russian русский, French français and Spanish español.
This helps us to share our wide range of aerosol instruments and filter test systems with a much wider user basis all over the world. Full brochure versions can be downloaded from our website.
Please have a look to our latest developments on aerosol generation, aerosol dilution, particle sizing, air filter testing, PM sensor validation and flow field scanning.
If you have further questions, please contact our marketing team:

For the 13th time, futureSAX GmbH hosted the Alumni Breakfast. This time, Topas hosted the event and welcomed the participants for mutual exchange. Discussions were held about start-up strategies and corporate successes made in Saxony. The focus was on activities and strategies for success in the company.
Topas would like to thank all interested participants as well as the opportunity for networking.


The contents of a study at the university are often grey theory. In January 2020, students from Technical University of Freiberg were able to gain an insight into an exciting practical working day. Mr. Dr. Rudolph introduced the company Topas and showed the factory and laboratories, the production hall and the offices. The prospective process engineers then saw various Topas test systems in action. Besides a filter measurement according to ISO 16890 with ALF 114, also a HEPA Filter measurement with manual Filter Scanning Test System AFS 152 was performed. Last but not least there was an insight into a current project of the R&D department. Here the future graduates saw what opportunities the company offers for the work of successful graduates.

We had an amazing show at the Automotive Testing Expo last week. Thanks to all attendees and the interesting exchanges with the technical experts from the industry.

Important topics of the event were e-mobilty along with battery management testing and fuel cell technologies.
Nevertheless, the current mobility is dominated by combustion engines. In terms of total emission reduction, we discussed with many visitors about the performance of the oil mist separator used in the blow-by of the crankcase ventilation system and its important role as the key factor for optimization.

The presented Blow-By test system BBT 143, along with the AVL BLOW BY METER supports a very fast and effective validation of the oil removal within the blow-by gas.

Since 1999 is the quality management of Topas GmbH got a successful certification according to DIN EN ISO 9001. Within the context, the 13TH monitoring audit took place assessing the ability of the management system and verifying its conformity with the audit criteria. The result shows, that the company achieved the audit objectives and the certification remains as an integral part of the corporate philosophy.

For an overall overview of Topas trade fair participations and company holidays, we have prepared an annual plan for our customers. The PDF can be downloaded here or retrieved on the right side below the search field.

Once again, an eventful year is coming to a close. We wish you all a peaceful and contemplative holiday season and a successful and wonderful New Year.
Please note: Topas GmbH will be closed from DEC22 – JAN01 due to Christmas + New Year’s Holiday. From the 2nd of January 2019 we are back again with the full commitment to you.


For the first time, Topas GmbH supports students for their academic career as part of the Deutschlandstipendium. In this way, more than 200 students have been supported and thus the bond between science and industry has been strengthened. From now on we support a scholarship holder with a monthly grant supplemented by additional federal funds. We wish our fellowship a successful year and look forward to seeing you again.


We are looking forward to meet you at our booth A12 in Hall W5.

Topas GmbH was once again honored with the seal “Innovative through Research” for special commitment to research and development by the Stifterverband für die Deutsche Wissenschaft e.V.


We are looking for you! The Topas GmbH team is looking for new colleagues. We look forward to receiving your application at

Here are the vacancies for our team.

More than 400 exhibitors from all over the world met again at Filtech this year. in 2018 Topas GmbH presented itself with a new booth design.

The Topas GmbH contributed with two presentations on “The new ISO 16890 – challenges for the test system operator to achieve reliable test results” and “Solution to the ISO 16890-4 – discharge of filter element”.

In the course of the three-day event, we were able to hold numerous interesting technical discussions and make promising new contacts and, above all, cultivate existing contacts.We are pleased to have once again met the interest of so many visitors with our products and solutions, because after the fair the exciting phase of the project realization begins.

We would like to thank you for the consistently positive feedback and look forward to the Filtech 2019! 


This year the Topas GmbH is represented with two contributions at the Filtech conference.

Session: G5 – Filter Test Systems | Day: 14 March 2018 | Time: 09:00 – 10:15 h | Speaker: C.Wabnitz

Below you will find an excerpt from the lecture

“The new ISO 16890 – challenges for the test system operator to achieve reliable test results”

Since Nov-2016 the new harmonised standard ISO 16890 for performance evaluation of filters for general air ventilation has become effective. The new ISO 16890 will replace the European standard EN 779 and harmonise the standard EN 779 with the American standard ASHRAE 52.2. The main goal of this new ISO 16890 has been to have a stronger correlation between laboratory filter testing and filter performance in real application operation. To achieve a more realistic laboratory filter evaluation the new standard requests for several changes at the test system setup as well as for a different performance of the test procedure. The most important change is done by defining new filter classes based on a PM efficiency rating.

This paper will describe the test setup and the test procedure realised at a turn-key filter test system for doing a fully ISO 16890 compliant filter testing. An overview will show the most important differences of ISO 16890, EN 779 and ASHRAE 52.2 filter testing supported by exemplary comparative test results. There will be a special focus on the technical realisation of the normative testing requirements by the test system operator. Based on our long-term experience in air filter testing a list of critical test parameters will be pointed out which are not described in detail in the standard but have to be observed by the operator…

If you have not registered yet for the conference, you can do it her: Filtech registration.

We look forward to your coming and to a lively exchange on the topic of ISO 16890 and your visit to our stand H9 in Hall 11.1.


image source: rclassen /

This year the Topas GmbH is represented with two contributions at the Filtech conference.

Session: F3 – Filter Media – Quality Control and Pore Size Analysis III | Day: 13 March 2018 | Time: 16:45 – 18:00 h  | Speaker: S.Kost

Below you will find an excerpt from the lecture

“Solution to the ISO 16890-4 – discharge of filter element”

One of the main challenges of the new harmonized standard ISO 16890 is the standardization of the discharge process of the filter element. So far the influence of the static charge of the filter elements was tested for F7 – F9 filters through discharging a filter media probe by dipping it into liquid isopropanol. In the future the complete filter has to be discharged by putting it into a cabinet and conditioning it with isopropanol vapor for 24 hours.

For this purpose a discharge cabinet, considering functionality as well as safety aspects, was developed. This paper will describe the functioning of the cabinet and relate it to the specifications according to ISO 16890-4. Generally the test system allows automated and reproducible discharging of complete filter elements with isopropanol vapor, using minimal resources. The use of isopropanol is limited to much less 1 l and its release controllable, as it is evaporated through a packed bed. High requirements in terms of safety and explosion protection are taken into account, by integrating an additional humidification and a purging function. With all the considered safety features, the setup of the test system in a standard room without any additional ventilation system or an extraction hood is possible. With this execution of a cabinet comparable tests and targeted studies of the key parameters as the conditioning time, humidity, filter material and recharging over time are possible.

As the effects of the discharging process are up to the current state still to some extend unknown, several conditioning processes with different filter elements were performed and the efficiency is measured before and after the process to exemplarily evaluate the change in the efficiency. Therewith the fundamental usefulness of the discharge requirement can be shown….


If you have not registered yet for the conference, you can do it her: Filtech registration.

We look forward to your coming and to a lively exchange on the topic of ISO 16890 and your visit to our stand H9 in Hall 11.1.



image source: rclassen /

The aerosol generator ATM 228 according to VDI 3491-2 for clean room validation according to ISO 14644-3 is a further development of the atomizer aerosol generator ATM 226 and fulfills the high standards Requirements of the VDI guideline 3491-2 excellent. According to ISO 14644-3, this device can be used to check the filter integrity of HEPA and ULPA filters as well as for recovery time measurement. Very small amounts of aerosol are needed to test very small filter surfaces. The ATM 228 has therefore been optimized in view of this requirement. Further information as well as the product brochure can be found here.



Within the nomination of the Sächsischer Staatspreis for Innovation 2017, a short spot for Topas GmbH was developed in preparation for the award of the prize. The small film is presented by Topas GmbH and will be discussed in detail about the Innovation Conditioning Cabinet TDC 584


On 28. August, the “Innovationspreis des Freistaates Sachsen 2017” was awarded on the futureSAX Innovation Conference. The Minister of State, Martin Dulig, awarded not only innovative companies, but also ideas from founders and start-ups. For the first time, the transfer prize was also awarded. This prize was given to Dr. Frank Schladitz of the C3 – Carbon Concrete Composite e. V., which we support as partners. We are proud to be among the nominees with the conditioning cabinet TDC 584, the worlds only solution for the safe neutralization of filter elements, according to ISO 16890. As earyl as 1994, Topas gmbH was awarded with the Saxon State Prize for Innovcation for the aerosol generator of the SLG series. In 2007, the PMP 694 opticatl particle sensor was awarded a special regognition as part of the competition “Innovationspreis des Freistaates Sachsen 2007”.

At the end of 2016, the new test standard ISO 16890 has already entered into force and is valid. In the transition phase to May 2018, EN779 will be replaced by ISO 16890 in medium term. With the new standard for classification and validation of general air filters, Topas has met the new requirements for filter testing technology and accompanies the introduction and implementation of the new test standard for new and existing Topas test systems of highest quality. With the filter test stand for general air filters (ALF 114), Topas is therefore the world’s first ISO 16890 standard test stand.
In the current edition 1/2017 of F & S – Filtering and Separating, Topas reports on the title and page 4 what new features the ISO 16890 will bring for the product range of Topas.

We are very delighted to see C³- Carbon Concrete Composite  received the German Future Prize 2016 and the Topas GmbH congratulate them for this most impressive science award in Germany.



More Details about the C³- Programm:

Delighted we can announce that our newly created brochure has been released (de / eng).

As download the brochure is available here (PDF 8.5 MB).
A look is worthwhile in any case!

The harmonization of international testing standard ISO 16890-4 requires neutralization of tested filter element by Iso-propyl-alcohole (IPA) treatment. Therefore a suitable test cabinet for filter discharging is needed.

Due to these problems TOPAS decided to develop a new cabinet for the filter conditioning according
to ISO 16890-4.


More information can be found here: TDC 584 – IPA Conditioning Cabinet for testing Air Filters acc. to ISO 16890-4

The Filter Test Rig ALF 114 has been developed especially for air filter testing according to standards ISO 16890-FDIS, EN 779:2012 and ASHRAE 52.2-2008. At Topas it could be accessed to a long-standing expertise in the field of construction and installing of filter test systems – since 1995 we have been developing, manufacturing, and installing particle filtration test rigs conforming to standards and user-defined ones for filter media and complete filter elements for quality control and and scientific work. Here quantification of dust holding capacity, differential pressure curves and filter efficiencies are the main.

For more information please click here.

Topas GmbH contribute to the reduction of emissions for the automotive industry:. The Blow-by Test Rig BBT143 This compact mobile measuring system has been developed for determination of oil droplet content in the crankcase gases (blow-by). With the robust optical inline measurement technology constructed of Topas, a time-saving recording of oil consumption values of complete engine maps is possible.

For further information and an individual quotation feel free to contact us.

Search for products

products on:

Coming events

20. - 24.9.2021
13th World Filtration Congress
1. - 3.9.2021
EAC 2021

Download annual calendar