RM4A(02)-90X70T0800

FLEX SUPPRESSOR[®] **Magnetic Sheet for RFID** 

## **Overview** 

The KEMET Magnetic Sheet for radio frequency identification (RFID) FLEX SUPPRESSOR prevents interference between a loop antenna and metallic objects and effectively improves the communication range of RFID. 

## **Applications** 

- Cell phone with radio frequency identification (RFID) function 

- Contactless IC card 

- RFID reader/writer 

- RFID tag 

The flexible sheet is a polymer base, blended with micronsized magnetic powders dispersed throughout the material. These sheets improve the magnetic flux convergence and can be cut into a variety of shapes and sizes. 

## **Benefits** 

- Magnetic flux convergence improvement – increases the relative permeability (u’) while keeping the magnetic loss (u”) low. 

- Effective carrier frequency 13.56 MHz and below 

- Resistant to shock, not brittle 

- Thin, flexible material used in portable equipment 

- Virtually no limitation in where it can be used 

- Less time required for installation 

- Easily cut into any shape 

- Easily laminates the FLEX SUPPRESSOR roll to the tag roll 

- RoHS compliant and halogen-free 

Sheet Type 

Roll Type 

**Built Into Tomorrow** 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

FS8005_MSR • 8/8/2023 

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FLEX SUPPRESSOR[®] Magnetic Sheet for RFID 

## **Part Number System** 

|**M4**|**(100)-**|**240X240**|**T0800**|
|---|---|---|---|
|Series|Thickness|Standard Dimensions|Adhesive Tape Thickness|
|M4<br>RM4A|(100) = 0.1 mm<br>(200) = 0.2 mm<br>(300) = 0.3 mm<br>(01) = 0.1 mm<br>(02) = 0.2 mm<br>(025) = 0.25 mm<br>(03) = 0.3 mm|90X70 = Sheet 90 mm x 70 mm<br>185X70 = Sheet 185 mm x 70 mm<br>220X185 = Sheet 220 mm x 185 mm<br>240X240 = Sheet 240 x 240 mm<br>240X10M = Roll 240 mm x 10 m<br>240X20M = Roll 240 mm x 20 m<br>240X30M = Roll 240 mm x 30 m<br>240X50M=Roll 240 mm x 50 m|T0800 = 0.03 mm<br>Blank = No adhesive tape|



## **Specifications** 

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High Magnetic Permeability &<br>Features<br>Low Magnetic Loss Type<br>Series M4 RM4A<br>Effective Carrier Frequency 13.56 MHz and below<br>Operating Temperature (°C) –40 to +105 –40 to +85<br>Thickness (mm) 0.1/0.2/0.3 0.1/0.2/0.25/0.3<br>240 X 240<br>Standard Dimensions (mm) 220 X 185<br>(Roll on request)<br>40 typical, at 13.56 MHz  50 typical, at 13.56 MHz<br>50 60<br>13.56 MHz 13.56 MHz<br>40 50<br>40<br>30<br>Permeability (µ) 30<br>20<br>20<br>10 10<br>0 0<br>1 10 100 1,000 1 10 100 1,000<br>Frequency [MHz] Frequency [MHz]<br>Specific Gravity [1] 3.1 typical 3.6 typical<br>Surface Resistivity (Ω/sq.) 1.0 X 10 [7]  typical<br>UL 94 HB  –<br>Approved Standard<br>UL File No. E176124<br>RoHS Compliant<br>Halogen Free<br>Environment  PVC Free<br>Lead Free<br>Red Phosphorus Free<br>Permeability µ Permeability µ<br>**----- End of picture text -----**<br>


_1 Value in 23°C atmosphere._ 

_Above specifications are for the FLEX SUPPRESSOR only (adhesives, etc., not included.)_ 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

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FLEX SUPPRESSOR[®] Magnetic Sheet for RFID 

## **Table 1 – Ratings & Part Number Reference** 

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Tape  Permeability  Specific  Surface<br>Part Number Series Thickness Weight<br>Thickness at 13.56 MHz Gravity Resistivity<br>mm mm µ Typical Ω/sq. typical g<br>M4(100)-185X70T0800 M4 0.1 0.03 40 3.1 1.0 X 10 [7] 4.28<br>M4(100)-240X10M M4 0.1 -- 40 3.1 1.0 X 10 [7] 730.80<br>M4(100)-240X10MT0800 M4 0.1 0.03 40 3.1 1.0 X 10 [7] 803.88<br>M4(100)-240X240T0800 M4 0.1 0.03 40 3.1 1.0 X 10 [7] 19.04<br>M4(100)-240X50M M4 0.1 -- 40 3.1 1.0 X 10 [7] 3,479.17<br>M4(100)-240X50MT0800 M4 0.1 0.03 40 3.1 1.0 X 10 [7] 3,966.67<br>M4(100)-90X70T0800 M4 0.1 0.03 40 3.1 1.0 X 10 [7] 2.08<br>M4(200)-185X70T0800 M4 0.2 0.03 40 3.1 1.0 X 10 [7] 8.04<br>M4(200)-240X10M M4 0.2 -- 40 3.1 1.0 X 10 [7] 1,461.60<br>M4(200)-240X10MT0800 M4 0.2 0.03 40 3.1 1.0 X 10 [7] 1,534.68<br>M4(200)-240X240 M4 0.2 -- 40 3.1 1.0 X 10 [7] 33.41<br>M4(200)-240X240T0800 M4 0.2 0.03 40 3.1 1.0 X 10 [7] 35.75<br>M4(200)-240X30M M4 0.2 -- 40 3.1 1.0 X 10 [7] 4,176.25<br>M4(200)-240X30MT0800 M4 0.2 0.03 40 3.1 1.0 X 10 [7] 4,468.75<br>M4(200)-90X70T0800 M4 0.2 0.03 40 3.1 1.0 X 10 [7] 3.91<br>M4(300)-185X70T0800 M4 0.3 0.03 40 3.1 1.0 X 10 [7] 11.79<br>M4(300)-240X10M M4 0.3 -- 40 3.1 1.0 X 10 [7] 2,192.40<br>M4(300)-240X10MT0800 M4 0.3 0.03 40 3.1 1.0 X 10 [7] 2,265.48<br>M4(300)-240X20M M4 0.3 -- 40 3.1 1.0 X 10 [7] 4,175.83<br>M4(300)-240X20MT0800 M4 0.3 0.03 40 3.1 1.0 X 10 [7] 4,370.83<br>M4(300)-240X240 M4 0.3 -- 40 3.1 1.0 X 10 [7] 50.11<br>M4(300)-240X240T0800 M4 0.3 0.03 40 3.1 1.0 X 10 [7] 52.45<br>M4(300)-90X70T0800 M4 0.3 0.03 40 3.1 1.0 X 10 [7] 5.74<br>RM4A(01)-185X70T0800 RM4A 0.1 0.03 50 3.6 1.0 X 10 [7] 5.19<br>RM4A(01)-220X185T0800 RM4A 0.1 0.03 50 3.6 1.0 X 10 [7] 16.31<br>RM4A(01)-90X70T0800 RM4A 0.1 0.03 50 3.6 1.0 X 10 [7] 2.52<br>RM4A(02)-185X70T0800 RM4A 0.2 0.03 50 3.6 1.0 X 10 [7] 9.85<br>RM4A(02)-220X185 RM4A 0.2 -- 50 3.6 1.0 X 10 [7] 29.31<br>RM4A(02)-220X185T0800 RM4A 0.2 0.03 50 3.6 1.0 X 10 [7] 30.96<br>RM4A(02)-90X70T0800 RM4A 0.2 0.03 50 3.6 1.0 X 10 [7] 4.79<br>RM4A(025)-185X70T0800 RM4A 0.25 0.03 50 3.6 1.0 X 10 [7] 12.18<br>RM4A(025)-220X185 RM4A 0.25 -- 50 3.6 1.0 X 10 [7] 36.63<br>RM4A(025)-220X185T0800 RM4A 0.25 0.03 50 3.6 1.0 X 10 [7] 38.29<br>RM4A(025)-90X70T0800 RM4A 0.25 0.03 50 3.6 1.0 X 10 [7] 5.93<br>RM4A(03)-185X70T0800 RM4A 0.3 0.03 50 3.6 1.0 X 10 [7] 14.51<br>RM4A(03)-220X185 RM4A 0.3 -- 50 3.6 1.0 X 10 [7] 43.96<br>RM4A(03)-220X185T0800 RM4A 0.3 0.03 50 3.6 1.0 X 10 [7] 45.61<br>RM4A(03)-90X70T0800 RM4A 0.3 0.03 50 3.6 1.0 X 10 [7] 7.06<br>mm mm µ Typical Ω/sq. typical g<br>Part Number Series Thickness ThicknessTape  at 13.56 MHzPermeability  Specific Gravity Surface Resistivity Weight<br>**----- End of picture text -----**<br>


© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

FS8005_MSR • 8/8/2023 

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FLEX SUPPRESSOR[®] Magnetic Sheet for RFID 

## **Applications** 

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Communication disturbance by metal Effect of magnetic sheet<br>(degraded communication range) (improved communication range)<br>Transmission Transmission<br>IC Card distancedecreases distanceincreases<br>Magnetic energy Functions as magnetism<br>is consumed as deflection yoke<br>electric current<br>inside the metal Metal part (e.g. case) Va FLEX SUPPRESSOR oe ow [®] ,<br>_ —/ . La f<br>Media<br>Magnetic field Media Magnetic flux<br>lines Magnetic flux Reader<br>Reader Magnetic sheet<br>Loop antenna Metal Metal<br>Absorbed Passing<br>magnetic flux magnetic flux<br>**----- End of picture text -----**<br>


|**Devices**|**RFID Transmission**<br>**Quality Improvement**|
|---|---|
|Mobile phone|For communication distance<br>improvement|
|Notebook PC and tablet||
|RFID card reader/writer||
|RFID card and tag||



Application example in a cell phone with RFID function. 

## Laminating the FLEX SUPPRESSOR roll to the tag roll 

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Communication Distance<br>Enhancement RFID antenna<br>FLEX SUPPRESSOR<br>ra<br>oe a<br>**----- End of picture text -----**<br>


© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

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FLEX SUPPRESSOR[®] Magnetic Sheet for RFID 

## **Applications cont.** 

Communication distance evaluation of a cell phone RFID antenna. 

- **RFID** circuit board antenna for mobile phones (About **40 mm × 30 mm** ) 

- Circuit board antenna only (in open space) 

- Circuit board antenna with a metal plate in its proximity M4 installed between the circuit board and a metal plate 

- O 4 RM4A installed between the circuit board and a metal plate 

- **ISO/IEC 18092** compatible Contactless reader/writer 

Measurement of the maximum + metal plate communication distance of both of the above (4 levels) Above data are not guaranteed values. 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

FS8005_MSR • 8/8/2023 

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FLEX SUPPRESSOR[®] Magnetic Sheet for RFID 

## **Examples of Shapes** 

KEMET FLEX SUPPRESSOR sheets can be cut into a variety of shapes and sizes: 

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With holes, cut-out shapes, and circular shapes Precut<br>Reel Roll With Aluminum or PET sheet<br>**----- End of picture text -----**<br>


Some examples of customization, available upon request: 

- The use of PET film in the front, for insulation or mechanical support 

- The use of aluminum sheet in the front, for shielding effect 

- The use of different adhesive tapes on the back - stronger, thinner, thicker, etc. 

|**Customization Examples**|**Where**|**Function**|
|---|---|---|
|PET Film|Front|Insulation or mechanical support|
|Aluminum sheet|Front|Shielding effect|
|Different adhesive tape|Back|Stronger adhesive tape<br>Thinner or thicker tape<br>Reflow capable, double-sided tape|



© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

FS8005_MSR • 8/8/2023 

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FLEX SUPPRESSOR[®] Magnetic Sheet for RFID 

## **Permeability Characteristics** 

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M4<br>50<br>13.56 MHz<br>40<br>30<br>20<br>10<br>0<br>1 10 100 1,000<br>Frequency [MHz]<br>Permeability µ<br>**----- End of picture text -----**<br>


RM4A 

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60<br>13.56 MHz<br>50<br>40<br>30<br>20<br>10<br>0<br>1 10 100 1,000<br>Frequency [MHz]<br>Permeability µ<br>**----- End of picture text -----**<br>


© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

FS8005_MSR • 8/8/2023 

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FLEX SUPPRESSOR[®] Magnetic Sheet for RFID 

## **Handling Precautions** 

Avoid high temperature, humidity and direct sunlight. Storage environment should be below 40°C and below 70% relative humidity. The surface resistance value listed in this catalog is a reference value of the circuit parameter to indicate noise suppression. The value does not represent the product’s insulation characteristics. The value may become lower if an excess pressure is applied to the product. The products in this datasheet are not insulators, they need to be handled as conductors. Care must be taken when in use, so that conductive material does not contact the surface or the edge of the FLEX SUPPRESSOR sheet. Insulation process should be performed when contact to conductive material is probable. Depending on the processing procedure, powdery substance may drop out from sheet surface or the edge, if the cutting of the sheet is performed. Depending on the location, care must be taken, as this powder may effect the component’s performance. 

Any dust, oil or moisture must be cleaned from the surface of the installation area when using an adhesive tape to attach the sheet.The adhesive tape may begin to lose some of its adhesiveness after being in storage for six months. This has no impact on the EMI filtering effectiveness. 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

FS8005_MSR • 8/8/2023 

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FLEX SUPPRESSOR[®] Magnetic Sheet for RFID 

## **Information on environmentally influential substances** 

The FLEX SUPPRESSOR does not contain any of the substances listed below: 

## **(1) Ozone depleting substance** 

- CFC (chlorofluorocarbon) 

- Halon 

- Carbon tetrachloride 

- 1,1,1-Trichloroethane 

- HCFC (hydrochlorofluorocarbon) 

- HBFC (hydrobromfluorcarbon) 

- Methyl bromide 

## **(2) Substances regulated by EU RoHS Directive 2011/65/EU and EU Directive 2015/863** 

## • Lead and lead compound 

- Mercury and mercury compound 

- Cadmium and cadmium compound (content of plastics that are below 5 ppm) 

- Hexavalent chromium and hexavalent chromium compound 

- PBB (polybrominated biphenyl) and its kind 

- PBDE (polybrominated diphenylether) 

- DEHP (bis-(2-ethylhexy) phthalate) 

- BBP (benzylbuty phthalate) 

- DBP (dibutyl phthalate) 

- DIBP (diisobuty phthalate) 

## **(3) Other environmentally influential substances (examples)** 

- PCB (polychlorinated biphenyl) 

- Polychlorinated naphthalene 

- Hexachlorobenzene 

- Organotin compounds (tributyl tin, triphenyl tin) 

- Asbestos 

## • Azo compound 

- Chlorinated paraffin and its kind (paraffin chloride, chlorinated paraffin and chloroparaffin) 

- Radioactive substance 

- PVC 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

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FLEX SUPPRESSOR[®] Magnetic Sheet for RFID 

## 

For a complete list of our global sales offi  ces, please visit www.kemet.com/sales. 

## **Disclaimer** 

YAGEO Corporation and its affi  liates do not recommend the use of commercial or automotive grade products for high reliability applications or manned space fl ight. 

All product specifi cations, statements, information and data (collectively, the “Information”) in this datasheet are subject to change. The customer is responsible for checking and verifying the extent to which the Information contained in this publication is applicable to an order at the time the order is placed. All Information given herein is believed to be accurate and reliable, but it is presented without guarantee, warranty, or responsibility of any kind, expressed or implied. 

Statements of suitability for certain applications are based on KEMET Electronics Corporation’s (“KEMET”) knowledge of typical operating conditions for such applications, but are not intended to constitute – and KEMET specifi cally disclaims – any warranty concerning suitability for a specifi c customer application or use. The Information is intended for use only by customers who have the requisite experience and capability to determine the correct products for their application. Any technical advice inferred from this Information or otherwise provided by KEMET with reference to the use of KEMET’s products is given gratis, and KEMET assumes no obligation or liability for the advice given or results obtained. 

Although KEMET designs and manufactures its products to the most stringent quality and safety standards, given the current state of the art, isolated component failures may still occur. Accordingly, customer applications which require a high degree of reliability or safety should employ suitable designs or other safeguards (such as installation of protective circuitry or redundancies) in order to ensure that the failure of an electrical component does not result in a risk of personal injury or property damage. 

Although all product–related warnings, cautions and notes must be observed, the customer should not assume that all safety measures are indicated or that other measures may not be required. 

When providing KEMET products and technologies contained herein to other countries,  the customer must abide by the procedures and provisions stipulated in all applicable export laws and regulations, including without limitation the International Traffi  c in Arms Regulations (ITAR), the US Export Administration Regulations (EAR) and the Japan Foreign Exchange and Foreign Trade Act. 

_KEMET is a registered trademark of KEMET Electronics Corporation._ 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

FS8005_MSR • 8/8/2023 

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