Shielding materials and products are diverse. And extremely rich in essential technical details - a dramatic disadvantage for the layman. A small change in numbers in the screening attentuation report can ultimately mean a huge difference in measurement technology. EMF shielding classes create the common thread.
In the ULTRA performance class, the focus is on MAXIMUM. Only highly developed shielding materials create our metrological requirements for the SFERICS® ultra classification. When every single dB counts!
SFERICS® ultra - for data centers, laboratories and people
Shielding materials and products are diverse. And extremely rich in essential technical details - a dramatic disadvantage for the layman. A small change in numbers in the umbrella report can ultimately mean a huge difference in measurement technology. EMF shielding classes create the common thread.
In the PRO performance class, the focus is on HIGH. Purely highly developed shielding materials create our technical requirement for a SFERICS® pro classification. When above-average shielding is the goal!
SFERICS® pro - for server rooms, universities and people
Proper Control of a Product’s Shielding Performance | Why a Smartphone is Not a Measuring Device and Unsuitable for Testing
“I’ve now invested in a shielding product, such as a sleeping bag, blanket, canopy, or tent, and put my mobile phone inside it, but I still have reception and remain reachable. Is the product defective?“
We receive questions like this from customers time and again when their expectations of the ordered shielding product are not met. “If the shielding works, my phone or smartphone should have no reception!”, is often the general perception and expectation from someone unfamiliar with the topic of protection against mobile radiation and how to verify it.
And NO, it’s unfortunately not that simple. A mobile phone is an extremely powerful communication device and is definitely not a measuring instrument, making it completely unsuitable for testing the shielding performance of shielding materials.
Electrosmog RF Control Measurement or why a mobile phone is nowhere near suitable for testing!
All our shielding materials have been rigorously examined in professional EMF laboratories. Relevant shielding attenuation values and test reports can be downloaded directly from the product page at the bottom.
Attempting to verify the shielding performance of our materials with a personal broadband measuring device, especially OUTSIDE of a shielded room or laboratory, is ineffective or only marginally useful. We often see individuals trying to test the performance of shielding materials with their mobile phones. They quickly wrap their phones in the shielding fabric, or place it inside the canopy, sleeping bag, tent, or shielded room, and then call it. If the phone rings, the shielding material is automatically perceived as defective or poor. The same applies when the phone’s display still shows a receivable network.
From a measurement standpoint, this is a significant error and a completely incorrect conclusion!
The general public often overlooks the fact that a mobile phone is a highly developed and extremely powerful communication device, capable of compensating for poor networks by increasing its transmission power. Moreover, it continuously communicates with the base station (cell tower), constantly testing the quality of the communication link. When the network worsens, the tower compensates by increasing the power to maintain the connection (beamforming).
Due to the high efficiency of modern smartphone antennas, almost any low-quality shielding material can be penetrated by increased transmission power. However, this also creates a “microwave effect” – radiation that cannot “get in” also cannot “get out.” The mobile phone will inevitably increase its transmission power to break through the shielding, leading to a rapidly draining battery. The result is significantly higher electromagnetic exposure to the body than without shielding.
Network Quality Display | 4 Different Bars on the Screen
This network display (4 bars at the top of the screen) provides no information about the EMF field strength of the mobile network being used, only about the quality of a phone call in the current network. Whether the body is exposed to 10,000, 100,000, or 1,000,000 µW/m², it still shows 4 bars. If the radiation density of the EMF exposure to the body is reduced from 35,000 µW/m² to well below 100 µW/m², or even under 10 µW/m², thanks to the chosen shielding material, there will still be 3 or 4 bars on the display – despite the massive difference for the body, its cells, and its nervous system.
The network provider’s coverage in the chosen region also makes a significant difference – if the network is poor, it might just be the wrong provider for that area. Let’s not forget the time factor – just because the exposure value is low at the time of measurement doesn’t mean it will stay that way over months or years. Therefore, deciding to shield even just one room in daily life – ideally the bed or the entire bedroom – is always a good, important, and forward-thinking decision. Protect your restful sleep – your body will thank you with energy and health.
Effective Procedure for Testing Shielding Effectiveness
We are very pleased when people take an interest in shielding and conduct their own tests on shielding materials. This highlights how advanced our shielding materials and products are.
To achieve this, a suitable RF measuring device is necessary – one that measures rather than communicates like a mobile phone, essentially “listening.” The measurement should be conducted twice – once outside the shielding and then inside the shielding. The difference between the two measurements indicates the shielding effectiveness. For example:
Measurement outside the shielding: 35,000 µW/m²
Measurement inside the shielding: 35 µW/m²
Reduction in radiation exposure: 99.9% = 30 dB shielding attenuation!
Shielding Attentuation Overview | dB and Percentage
10 dB | 90%
20 dB | 99%
30 dB | 99,9%
40 dB | 99,99%
50 dB | 99,999%
60 dB | 99,9999%
70 dB | 99,99999%
80 dB | 99,999999%
90 dB | 99,9999999%
What Is Required to Completely Disconnect a Mobile Phone from the Network?
There is no universally valid answer to this. It always depends on the strength of the available mobile network. However, with 100 dB shielding attenuation across the entire frequency range (up to 40 GHz), the likelihood of successfully disconnecting from the network becomes increasingly higher.
Industry, universities, and laboratories use sealed rooms built from appropriately powerful metal plates, with artificial lighting, no windows, and airlock doors, often constructed underground. These materials are available, but the question arises: would one want to sleep in such a laboratory environment made of metal walls?
For good reason, we always talk about “radiation reduction” and never “radiation-free.” Our goal in building biology is to create a natural environment where humans can feel comfortable, recover, and regenerate. Hence our name “SFERICS” – a natural electromagnetic wave.
P.S.: Mobile communication technology involves billions (if not trillions) of euros in development. The goal is to ensure connectivity anytime and anywhere. If it were easy to disrupt this connection, the past and future development costs would have no justification.
The dose of radiation exposure to the body from one’s own mobile phone is dramatically higher in poor network conditions. When it comes to the brain or nervous system’s exposure, a few minutes in a bad network can equal many hours in a good network. “The
radiation dose from 5 minutes in a bad network can equal 10 hours of phone use in a very good network.” The better the network, the less radiation the mobile phone emits. Of course, this is a simplified explanation, as radiation exposure in a mix of GSM, UMTS (3G), LTE (4G), and 5G is much more complex. Nevertheless, this basic rule always applies!
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