At Schlegel Electronic Materials Inc. we have an unwavering commitment to the safety of our customers and our co-workers during the COVID-19 virus pandemic. SEM is a worldwide company and our facilities in Asia, Europe, and the United States are working in concert to provide production support as needed. We are currently operating at 100%

Absorber-BandSorb®

Schlegel Electronic Materials (SEM) is pleased to introduce BandSorb® elastomer absorbers. Our new range of elastomer Cavity resonance (BandSorb SC) Absorbers materials. The material consists of a thin, flexible, high-loss, magnetically loaded, electrically non-conductive silicone rubber. Schlegel can provide this material with different configurations for use in the frequency range of 1 GHz up to millimetre waves. With our own dedicated on site manufacturing and R & D team we are able to work closely with our customers to provide custom solutions where needed.

The BandSorb absorbers are currently available as silicone rubber elastomer and a dielectric foam absorber.
The silicone rubber elastomer are available as:

SC: a flexible, high-loss, magnetically loaded, electrically non-conductive silicone rubber.
ST: a resonant absorbers which reflect -20 dB or less.
SH: a thermally conductive microwave absorber

Next to the silicone rubber material a lightweight high loss carbon impregnated dielectric foam absorber BandSorb FB. BandSorb FB provides a very low cost solution over the thinner rubber absorbers.
BandSorb can be used for applications requiring absorption across a wide range of frequencies , such as antenna cross-talk and cavity resonance suppression.

Specifications

BandSorb SC Series

BandSorb SC series is suitable for most commercial, telecommunication, military and medical applications. The high magnetic loss of the BandSorb SC series is designed to exhibit high loss and are intended to be applied to metal surfaces. When placed on the inside of a microwave cavities BandSorb SC series will reduce the Q of the cavity, eliminate surface currents and generally dampen reflections.

BandSorb SC series materials can be supplied in sheets as well as custom die cut or kiss cut configurations.  BandSorb SC materials can be supplied with or without pressure sensitive adhesive (PSA). Myriad options give you the customer flexibility when choosing which BandSorb SC product will work best in your design.  BandSorb SC materials are available in standard thicknesses however we can offer custom sizes and thicknesses to suit your specific requirements.

Applications

BandSorb SC series provides a flexible solution that supports a wide range of EMI and RF suppression requirements.

Suppressing resonance and harmonics from circuitry, absorbing RF emissions from wiring, and reducing interference from internal peripheral devices are just a few examples of the use of BandSorb SC inside electronics housings (computers, server racks, switches,….)

BandSorb SC series can be used to reduce RF coupling between microwave components inside electronic housings. Typical applications include power amplifiers, oscillators and down/up converters.

When bonded to a metal surface the BandSorb SC series will significantly reduce the reflectivity of metal objects or structures through the absorption of microwave currents.

In the telecommunication market, the material can be applied to antenna elements, microwave dishes, the inner or outer surfaces of waveguides for isolation, attenuation, or modification of radiating patterns. When applied to the side or even rear surfaces of certain objects this material will cause a significant reduction in “head on” reflectivity or backscattering.

BandSorb SC series can also be used for circuit-to-circuit EMI interference and reduction of unwanted emissions from the imaging CCD’s and LCD displays.

In the automotive market the BandSorb SC series can be used to suppresses interference from on-board electronics, such as telematics, on-board radar-based systems, GPS circuitry, and display systems.

CHARACTERISTICSTESTUNITSPECIFICATIONS  
SEM Elastomers Absorber--SC-31SC-52SC-88
Typical Frequency Range-GHz≥12≥6<6
Typical Thicknesses-mm (inch)0.25 (0.01), 0.50 (0.02), 1.0 (0.04) and 1.5 (0.06)
Typical Size-mm (inch)300 x 300 (11.8 x 11.8)
Elastomer Binder--Silicone
HardnessASTM D 2240Shore A657587
ElongationASTM D 412%403712
Tensile StrengthASTM D 412MPa (psi)3.3 (479)4.5 (653)4.1 (595)
Maximum service Temperature-°C (°F)170 (338)170 (338)170 (338)
Flammability RatingUL94*-V0V0V0
Colour--GreyGreyGrey
Volume ResistivityASTM D 991<-cm> 1010> 1010>  1010
(<-in)(>4 x 109) (>4x 109)(>4x 109)
Compliance--2015/863/EU (RoHS 2.0) Compliance, REACH SVHC Compliance, Halogen free

*Tested in accordance of UL94 specification


Product Number Example

SC –88 -05 -A
Product NameAttenuation@10GHzThickness (0.5mm)With Pressure Sensitive Adhesive: A, blank: no tape

BandSorb SN Series

BandSorb SN series is an ultrathin near field noise suppression absorber used for EMI control in electronic devices. The absorber is designed for the frequency range from 10 MHz up to 6 GHz. It is used to mitigate EM energy; it interacts and suppresses the magnetic field at the noise source.

Availability:
BandSorb SN series materials can be supplied in sheets as well as custom configurations, standard sheet size is 300 mm x 300 mm.
BandSorb SN materials can be supplied with or without pressure sensitive adhesive (PSA).

Features and Benefits:
High magnetic permeability.
RoHs, Halogen Free, Reach compliant

Applications:
BandSorb SN series absorber can be placed over CPUs, main chip sets and other memory and power IC devices to suppress radiated noise causing interference with RF functions, crosstalk or SAR emissions. It can be used to suppress noise currents from circuit trace lines and flat cables that act like radiating antennas causing EMI problems and crosstalk issues.

CHARACTERISTICSTESTUNITSPECIFICATIONS  
SEM Elastomers absorber-SN-32SN-120SN-130
Typical Frequency Range-GHz< 6< 6< 6
Typical Thicknesses-mm (inch)0.50 (0.02)0.1 (0.004),
0.5 (0.02)
0.05 (0.002),
0.1 (0.004),
Available Sizemm (inch)300x20000/300x50000/200x300
(11.8x787.4/11.8x1968.5/7.87x11.8)
HardnessASTM D 2240Shore A90--
ElongationASTM D 412%0.35
Tensile StrengthASTM D 412MPa (psi)3.1 (450)5.6 (812)5.6 (812)
Service Temperature-°C (°F)-40 to 85
(-40 to 185)
-40 to 120
(-40 to 248)
-40 to 120
(-40 to 248)
Flammability RatingUL94*-V2V2V2
Colour--SilverSilverSilver
Surface ResistivityASTM D 991Ω-cm (Ω-in)> 10 12 (>10 12 )> 10 6 (> 10 6 )> 10 6 (> 10 6 )
Compliance2011/65/EU(RoHS 2.0) Compliance, REACH SVHC Compliance, Halogen free

– the technical specification data is based on SEM tests and analysis that we believe to be reliable. However, in no event, shall SEM be liable for inaccuracies or omissions contained therein. In all cases, details and values should be verified by the customer
-UL is a registered trademark of Underwriters Laboratories, Inc.,
* tested according to.

Electromagnetic Properties


Product Number Example

SN –32 -50 -A
Product NameMu@10MHzThickness (0.5mm)PSA (blank: No PSA)

BandSorb HP Series

BandSorb HP series is a thin high permeability ferrite sheet designed to have low losses at 13.56 MHz. The high permeability makes it ideal to use for NFC, RFID application & wireless charging application.

Availability:
BandSorb HP series materials can be supplied in sheets as well as custom configurations, standard sheet size is 125 mm x 125 mm.
The BandSorb HP consists out of ferrite covered with a protective film on one side and adhesive tape on the other side.

Features and Benefits:
High magnetic permeability, low loss
RoHs, Halogen Free

Applications:
BandSorb HP series can be used to improve the performance of:

  • NFC antenna for mobile phones and automotive.
  • NFC or RFID antenna for security & access control system.
  • Wireless charging for mobile phones and battery powered handheld electronic devices
CHARACTERISTICSTESTUNITSPECIFICATIONS
BandSorb™--HP-15010
Real Permeability@13.56MHz, 0.1Vμ'150
Imaginary Permeability@13.56MHz, 0.1Vμ”<5
Ferrite Thicknesses-mm (mil)0.1 (3.9)
Typical Thicknesses-mm (mil)0.15 (5.9)
Tensile StrengthASTM D 1000MPa (psi)6.4 (928)
Service Temperature-°C (°F)-25 to 120 (-13 to 248)
Flammability RatingUL94*-V2
Colour--Black
Surface ResistivityASTM D 991Ω-cm (Ω-in)> 10 9 (>10 9 )
Dielectric strength-V400
Compliance2011/65/EU(RoHS 2.0) Compliance, Halogen Free

– the technical specification data is based on SEM tests and analysis that we believe to be reliable. However, in no event, shall SEM be liable for inaccuracies or omissions contained therein. In all cases, details and values should be verified by the customer
-UL is a registered trademark of Underwriters Laboratories, Inc.,
* tested according to.

Electromagnetic Properties

Structure

Product Number Example

HP –150 -10 -4040
Product NamePermeability @ 13.56MHzThickness Ferrite (0.1mm)Part Size code (40x40 mm)

BandSorb FB Series

BandSorb FB is a lightweight high loss carbon-impregnated dielectric foam absorber.
BandSorb FB provides a very low-cost solution for many applications over the thinner more expensive rubber absorbers.
BandSorb FB can be used for applications requiring absorption across a wide range of frequencies, such as antenna cross-talk, side lobe reduction, and cavity resonance suppression.

Availability:
BandSorb FB series materials can be supplied in sheets as well as custom configurations. The standard sheet size is 610 mm x 610 mm. The BandSorb FB consists out of carbon loaded polyurethane foam. BandSorb FB is electrically conductive due to the use of the carbon dispersion.

Features and Benefits:
Lightweight, flexible and easy to trim, High Loss, low density.
Available in different thicknesses to work in a wide range of broadband frequencies.

Applications:
BandSorb FB series can be used to

  • lower cavity Q’s in RF amplifiers, oscillators, cabinets containing microwave devices, computer housings, LNB’s.
  • isolation of antennas by Insertion loss, shrouding antennas to improve the antenna patterns and undesired back lobes
  • reduce surface currents on radiating elements and outer ground-plane type surfaces.
  • Reflectivity of an object (metal or otherwise) can be reduced somewhat by applying one or more layers.

Physical Properties:

CHARACTERISTICSTESTUNITBandSorb® FB
Frequency RangeInsertion LossGHz>1
Size-mm (inch)610 x 610 (24x24)
Typical Thicknessmm (inch)3.2 (1/8), 6.4 (1/4), 9.5 (3/8), 12.7 (1/2),
19.1 (3/4)
Maximum service Temperature-°C (°F)100 (212)
Compliance2011/65/EU(RoHS 2.0) Compliance,
REACH SVHC Compliance, Halogen free
 Attenuation (dB/cm)Relative Impedance (|Z|/Z0)
BandSorb®3 GHz10 GHz3 GHz10 GHz
FB-183.24.70.690.82
FB-204.270.610.78
FB-227.414.90.550.74
FB-2411240.250.44
FB-2616340.180.31
FB-2820400.160.27
FB-3024460.130.22

-the technical specification data is based on SEM tests and analysis that we believe to be reliable. However, in no event, shall SEM be liable for inaccuracies or omissions contained therein. In all cases, details and values should be verified by the customer


Instructions for use:
BandSorb FB can be securely bonded to itself or to other materials such as metal, wood, and common plastic composites. To obtain a strong bond the surface should be thoroughly cleaned with a degreasing solvent. It can be readily cut with a band saw, scissors, or a sharp knife.
Product Number Example

FP –30 -3.2 -A
Product NameTypeThicknesswith Pressure Sensitive Adhesive: A, blank: no tape