electromagnetic wave absorp-tion at radar frequencies
ROHACELL® EC
ROHACELL® EC is a conductive, closed-cell foam specifically designed for stealth applications, including use in stealth aircraft and electromagnetic shielding.
ROHACELL® EC features all the exceptional thermomechanical properties and strength-to-weight ratios found in traditional ROHACELL® foam, but provides the added benefits of superior dielectric properties and absorption of electromagnetic waves at radar frequencies.
This unique combination of properties is the result of loading the ROHACELL® polymer with carbon particles during processing - making it an excellent sandwich core solution for components requiring both radar absorption properties and superior mechanical performance.
Dielectric properties
|
|
Frequency [GHz] |
ROHACELL® 71 EC |
ROHACELL® 150 EC |
|
Real part of permittivity |
5 |
1.44 |
1.83 |
|
|
10 |
1.33 |
1.62 |
|
|
20 |
1.25 |
1.68 |
|
|
30 |
1.28 |
1.52 |
|
Imaginary part of permittivity |
5 |
0.18 |
0.41 |
|
|
10 |
0.12 |
0.30 |
|
|
20 |
0.14 |
0.24 |
|
|
30 |
0.10 |
0.20 |
Scattering Parameters determined using transmission/ reflection/ method (waveguide and Vector Network Analyzer).
Permittivity determined using Nicholson Ross Weir algorithm.
Single measurement based values.
Efficient Processing
ROHACELL® EC can withstand the most demanding curing and processing conditions up to 180°C and 7 bars depending on material density. It is compatible with all common curing processes including vacuum infusion, resin transfer molding, pre-preg autoclaving, as well as hand lay-up.
Notice : Evonik is aware of its product responsibility to the global community and takes reasonable care in the distribution of its products. ROHACELL® EC purchase and usage may require a license and proof of end user application. This product is:
- Subject to EEC regulation 428/2009 (Dual Use Regulation) annex I 1C101
- Subject to EEC regulation 1334/2000 annex IV, a EEC domestic export license is required
NOTE : United States customers purchasing from a US supplier are not subject to the above listed EEC regulations.
Sales range for ROHACELL® EC (mm)
|
ROHACELL®
|
Size [mm]
|
|
71 EC
|
1016 x 584 x 45
|
|
150 EC
|
1016 x 584 x 40
|
Thickness tolerance +/- 0.5 mm
Sales range for ROHACELL® EC (inch)
|
ROHACELL®
|
Size [inch]
|
|
71 EC
|
40 x 23 x 1.75
|
|
150 EC
|
40 x 23 x 1.50
|
Thickness tolerance +/- 0.02 inch
All dimension ranges presented in these tables are standard. To discuss any size or thickness not listed, please contact a ROHACELL® representative.