- Carbon coatings
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 is quite difficult on the internet to judge a supplier’s integrity based on a website. It’s easier for us as we have all competitors’ products here in our laboratory.
Thereby we determine more and more that the technical, physical, and chemical parameters are insufficient. Legal labelling requirements are not 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 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 expensive 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.
Some shielding paints are advertised e.g. with over 60 dB. When tested in our laboratory they only have 20-25 dB. That is factor 10,000 less!
Wrong shielding attenuation values
Competitors might think that their paint shields as well as our paints because graphite is graphite. But you can´t even trust professional expert reports, because clients always provide a completely painted sample board to the expert, who relies on the information given concerning material and spreading rate – without further checks. A subsequent examination showed that the dry weight of the paints often did not comply with the indicated amount of paint. There was much more dry weight on the sample boards than feasible for the indicated spreading rate. We have revealed this unacceptable situation and contacted all experts.
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.
There is the general assumption that “metallic” products reflect the radiation, whereas products “based on carbon” absorb the radiation. 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.
Shielding paints with a typical shielding attenuation of 40 dB have an absorption of less than 0.2%. This greatly conflicts with advertising promises of 15%.
Even graphene does not cause an absorption for low resistance shielding paints! After hundreds of material samples, we can for sure confirm this fact. Plus ‘proper’ graphene is often even not used at all, as 1 kg would cost several thousands of Euros.