Quality and shielding attenuation of our shielding paints
We have been developing paints based on carbon to shield electromagnetic fields since 2003. Since then, we have mixed tens of thousands of paint samples and invested several million euros in development. Not only end customers or building biologists have successfully shielded countless projects with thousands of tons of our HSF54. A lot of large fashion labels worldwide rely on our products for RFID shielding in all their stores, such as Zara, Levis, Esprit. Data centres worldwide are shielded with our HSF54, e.g. Apple, Amazon, AT&T. Military-related clients shield small facilities as well as intricate buildings with our HSF54. This alone already proves the high quality of our products.
In addition to that, we have the production of our paints monitored by TÜV-Süd. The whole production process including quality control, emission behaviour and economical use of preservative agents is subject to monitoring.
As market leader for shielding paints we have an entire overview over the competitive situation. After all, we want to know where we stand and be able to guarantee that you constantly get the best products on the market from us. We have all the products on site and test them regularly regarding measuring and application. We have been keeping an eye on frantic hustle and bustle for quite some time now, concerning false technical indications and implausible reports for screening attenuation.
The right choice of supplier
In general, it’s quite difficult on the internet to judge a supplier’s integrity based on a website. A hypothetical example: a supplier has a professionally designed website, as his main profession is e.g. web designer. The shielding paints offered on his website might be mixed on a part-time basis as small entrepreneur.
If we now had samples in our laboratory, we would discover that all the physical and chemical parameters are insufficient, to the point of inability for usage. Legal labelling requirements wouldn’t have been fulfilled.
People who choose such a product wouldn’t have made a good purchase, as an unsuccessful shielding still involves expenses and effort. Such products do not only hurt the supplier himself, but the whole industry.
- Are there official certifications, e.g. by TÜV?
- Are there reports concerning fire behaviour? Naming a norm is often not enough.
- Are there exact indications concerning added preservative agents for allergic persons?
- Are there any pictures of the company? How and where do they produce?
Reports screening attenuation
We have high-end measuring equipment up to 40 GHz on our premises for daily development and quality management, as the shielding attenuation is the most important and crucial purchase criteria for shielding paints.
Shielding paints are more and more often promoted with a shielding attenuation up to 40 dB (99,99%). When tested in our laboratory they often have only a shielding attenuation of 10dB (90%) – that’s factor 1000 less!
Wrong shielding attenuation values
One reason for this might be, that the competitor assumes that his shielding paint shields as well as our shielding paint does, because he thinks there is no difference in the quality of graphite: thus, he uses our indications unaudited. Always ask for a professional measuring done by prestigious experts!
In the past there was yet another reason for that: the client provided an already completely painted sample board to the expert. It was then assumed – without further checks – that the indications concerning material and spreading rate were correct. Frequently the client sent in a sample board that had been secretly painted with several layers and way too thick. We have revealed this unacceptable situation and have very intense contact to all prestigious experts since that time. That’s why you can trust professional measurements by now.
Invented and calculated absorption
Sometimes an ‘absorption ratio’ is promoted for shielding paints. We have two setups on our premises to measure the absorption capacities of materials: According to IEEE Std 1128-1998 and by 1-port-measurement with a vector network analyser.
There is the general assumption that “metallic” products reflect the pollution, whereas products on “based on carbon” absorb the pollution. Unfortunately, we must destroy this myth hereby.
The lower the electrical resistance, the more will be reflected. The higher the electrical resistance, the more will be absorbed. BUT: a high shielding attenuation (low resistance) conflicts with the needed high resistance for a good absorption.
We have measured that shielding paints with a typical shielding attenuation of 40 dB have an absorption of less than 0.01dB at the most. This conflicts with advertising promises of 15%. This value is also quite often only theoretically calculated, with doubtful measured values on the lower end of the frequency range.
Even the new wonder material graphene does not cause an absorption for low resistance shielding paints! After hundreds of material samples, we can for sure confirm this fact.