Bandsorb ES Series
Machinable, Magnetically Loaded Epoxy Absorber Material
Product Description
BandSorb® ES is a rigid, magnetically loaded epoxy material engineered for precision machining and optimized for microwave and RF applications. It is commonly used in RF loads, attenuators, waveguide terminations, and as a surface current suppressor on antenna elements.
Bonding can be achieved using epoxy adhesives, and our technical team is available to assist in selecting the most appropriate adhesive for your application. For mechanical mounting, components can be supplied with pre-threaded holes for straightforward installation.
Availability
BandSorb® ES is available in multiple grades (ES-6 to ES-140), each tailored to specific frequency ranges and attenuation requirements. Standard formats include:
- Flat Sheets: 305 x 305 mm, thicknesses from 6 mm to 75 mm
- Bars and Rods: Various diameters
- Custom Shapes: 3D geometries available upon request
Features and Benefits
- Rigid and durable
- Easily machinable
- Customizable for specific RF applications
Applications
- Waveguide terminators
- Wall attenuators
- Strip lines and cavity absorbers
- Antenna array surface current suppression
- High-Q inductor cores (e.g., slug tuners)
- RF filters and free-space absorbers
| CHARACTERISTICS | TEST | UNIT | SPECIFICATIONS | ||
|---|---|---|---|---|---|
| SEM Elastomers Absorber | – | ES | |||
| Typical Frequency Range | – | GHz | ≥ 1 | ||
| Elastomer Binder | – | Epoxy | |||
| Density | – | g/cc | 1.5 – 4.7 | ||
| Hardness | ASTM D 2240 | Shore D | >70 | ||
| Thermal Expansion per °C | ASTM E 831 | 1/°C | <0.002 | ||
| Thermal Conductivity | ASTM D 5470 (modified) |
W/mK | 0.47 – 1.65 | ||
| Tensile Strength | ASTM D 412 | MPa | >29 | ||
| Maximum Service Temperature |
– | °C (°F) | <180 (<356) | ||
| Color | – | – | Grey | ||
| Volume Resistivity | ASTM D 991 | Ω-cm (Ω-in) | > 10(10) (> 4 x 10(9) | ||
| Water Absorption | % 24 hours | <0.3 | |||
| Compliance | – | – | 2011/65/EU(RoHS 2.0) Compliance, REACH SVHC Compliance, Halogen free |
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*Tested in accordance of UL94 specification
*The technical specification data is based on SEM tests and analysis that we believe to be reliable. SEM will not be held responsible for inaccuracies or omissions contained therein. In all cases – details and values should be verified by the customer.
