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Various Electromagnetic Protective Clothing
Electromagnetic Shielding Material
For human bodyMGnet
Japan Patent No. 392205 / US Patent No. US6.855.883.B1
Reflects high frequency electromagnetic waves
ＭＧ(Microwave・Guard)net
- ・Uses hypoallergenic pure silver fibers
- ・Blocks high frequency electromagnetic waves (100kHz to several tens of GHz)
- ・Anti-static (static)
- ・High antibacterial and disinfecting performance
- ・High durability (resistant to bending and friction)
- ・Highly translucent and breathable
- ・Ultra-lightweight（20g／㎡）
- ・Approximately 25km of pure silver fibre is used per square metre.
- ・The surface area of silver is about twice that of the material, which makes it easy to react with water and ionize, providing high antibacterial and disinfecting effects.
The silver fibers are woven into a hexagonal shape.
- 1.MGNET 2 layers
- 2.High frequency electromagnetic waves
- 3.Electromagnetic wave reflection
Silver fiber (nylon99.9% pure silverIt is a material made by weaving nylon fibers (coated with 1.0% mercury) into a special honeycomb mesh (mesh size of about 1 mm), and combines the properties of nylon fibers (lightweight and flexible), silver (conductivity, electromagnetic shielding, antibacterial properties), and honeycomb mesh (durability, translucency, ventilation, heat dissipation).
| Part number | MGNET-010 | ||
|---|---|---|---|
| Fabric width x thickness x length | 105cm×0.2mm×About 80m | ||
| Weight (unit weight) | 20g／㎡ | ||
| material | Substrate | Nylon Fiber | |
| Coating Materials | silver（purity99.9％） | ||
| Electromagnetic wave shielding performance （KEC Method） |
100kHz～1000kHz | 1 piece | 21.5～23.7dB |
| 4 pieces | 23.2～51.9dB | ||
| 1000kHz～3GHz | 1 piece | 23.7～30.8dB | |
| 4 pieces | 51.9～61.3dB | ||
| Electromagnetic wave shielding performance （Free Space Method） |
4.5MHz～1.4GHz | 1 piece | 30～40dB |
| 4 pieces | 47～60dB | ||
| 7.75GHz～13GHz | 1 piece | 20～40dB | |
| 4 pieces | 40～60dB | ||
| Heat resistance | －30～200℃ | ||
| Durability (shielding performance) Opened or unopened from airtight bag |
After opening | Performance drops by 20-30% in one year | |
| Unopened | Maintains performance for over 10 years | ||
| Conductivity Surface resistance（Ω/10×10cm） | Vertical | 1.4Ω | |
| Horizontal | 3.3Ω | ||
| Antibacterial (Staphylococcus aureus) SEK Standards ※Uniform Testing Method Antibacterial for human use only |
Viable cell count | Under 20 | |
| Bacteriostatic activity value | 5.8 and above | ||
| Bactericidal activity value | 3.1 or higher | ||
| Silver ion elution test MGNET 0.1g and 5g in 1L Tap water※When put into Silver ion concentration over time The changes were tested. ※Simulated tap water made by mixing ultrapure water with sodium hypochlorite ●The silver ion concentration increases in proportion to the amount of water and the surface area of the silver. |
0.1g／L area Approximately 0.003㎡ Silver surface area: approx. 0.9㎡ |
１hour | 70ppb |
| ８hour | 108ppb | ||
| 24hour | 133ppb | ||
| ５ｇ／L area Approximately0.15㎡ silver table area Approximately45㎡ |
１minute | 117ppb | |
| ５minute | 211ppb | ||
| １０minute | 230ppb | ||
This is the electric field shielding data (in dB: decibels) when 1 to 4 sheets of MGNET are stacked for each frequency.※99% at 40dB, 99.9% at 60dBIf you want to completely block your mobile phone from receiving signals, you need a shielding performance of 40dB or more, so please use MGNET3 or more layers.
▲Comparison of shielding performance against near-field electric fields by overlapping MGNETs (KEC method): Measurement limit indicates the measurement limit value. By overlapping MGNETs, the shielding performance against high-frequency electromagnetic waves from 1MHz to 2.5GHz increases from 20dB to 60dB in a minute.
KEC method for measuring electric field shielding
Comparison of electromagnetic shielding performance by stacking MGNETs
We compared the electromagnetic shielding performance of stacked MGNETs. The shielding performance against near electric fields was measured using the KEC method as shown on the right. The results are shown in the table and graph above. These results show that stacking MGNETs improves shielding performance against high-frequency electromagnetic waves from 1MHz to 2.5GHz.Measurement method for shielding effectiveness against near electric fields using the KEC method (Figure 1)
（Figure 1）
Free space method electric field shielding data
This is the electric field shielding data (dB: decibels) when 1 to 6 sheets of MGNET are stacked for each frequency. Shielding performance evaluation of MGNET in each frequency band was carried out by HVS Technologies, Inc. (a specialist in electromagnetic absorbing shielding materials and test equipment attached to the Electro-Acoustic Research Center) in the United States. As a result, electromagnetic shielding performance was confirmed with a shielding rate of 30 to 40 dB or more at frequencies of 0.045 GHz to 1.4 GHz, and a shielding rate of 20 to 40 dB or more at frequencies of 7.75 GHz to 13.0 GHz. Details are shown in Table 2.
| Measurement Facility | HVS Technologies, Inc.（Electromagnetic Absorption Shielding Materials and Testing Equipment Specialty Center of the Electroacoustic Research Center, USA） |
|---|---|
| Measurer | Prof. Vijay K. Varadan（Center for Electroacoustic Materials and Device Engineering, Pennsylvania State University, USA） |
| Electromagnetic wave shielding material used | MGNET |
| Measuring Equipment | HVS Free Space Microwave Measurement System |
| How to Measure | Measurement of electromagnetic wave absorption rate and transmission attenuation rate of MGNET using HVS Free Space Microwave Measurement System |
| Measurement results |
|
Millimeter wave shielding test data ※Click to enlarge
