ROHACELL® HF
ROHACELL® HF is an advanced closed-cell rigid foam, rooted in polymethacrylimide (PMI) chemistry and entirely devoid of CFCs. This foam is uniquely suited for antenna applications due to its exceptional characteristics. Notably, ROHACELL® HF boasts remarkably low dielectric constants and excellent transmission properties at high frequencies, making it an ideal choice for applications requiring precise and efficient electromagnetic performance in the realm of antennas.
Product families
Applications
- Consumer Goods — Appliances & Electronics
- Consumer Electronics
Product Families
- Foam Cores
Other characteristics
- Brand
- ROHACELL
- Core Type
- Polymethacrylimide (PMI) Foam
- Functions
- Core Material
- Note
* Thickness tolerance +/- 0.2 mm, other tolerances available on request. 1-4 mm thick sheets supplied in ¼ or ½ sheet size.
- Markets
- Consumer Goods
- Electrical & Electronics
- Core
- Polymethacrylimide (PMI) Foam
- Technology
- Composite Materials
- Labeling Claims
- Chlorofluorocarbon (CFC)-Free
- Composites End Use
- Antenna
- Mammography Plates
- Radomes
- Material Features
- Good Rigidity
- Low Dielectric Constant
- Low Resin Uptake
- Machinable
- Non Corrosive
- Processing Benefits
Featuring an extremely fine closed-cell structure, the foam ensures minimal resin uptake and problem- free compatibility with metallic facing materials due to the absence of corrosive effects.. ROHACELL® HF foam is suitable for hand lay-up, prepreg processing and vacuum infusion at temperatures up to 130 °C (266 °F) and pressures up to 0.3 MPa (44 psi).
- Recommended Applications
Used worldwide in miniature antennas in cell phones to large fixed ship-based and stationary antenna structures, the foam is also used as structural core in radomes and mammography plates.
- Thermoforming and Shaping
ROHACELL® HF can be easily thermoformed or CNC machined to meet application requirements.. High precision, pre-shaped and ready-to-use foam cores in complex or simple geometries can be supplied by the ROHACELL® Shapes Department.
- Composite Materials Functions
- Core Material
- Composites Processing Methods
- Hand Lay-up
- Prepreg Processing
- Thermoforming
- Vacuum Infusion Processing (VIP)
- Structural Foam for Antenna Application
ROHACELL® HF is a closed-cell rigid foam based on polymethacrylimide (PMI) chemistry completely free of CFC's. With its extremely low dielectric constants and particularly favorable transmission properties at high frequencies, ROHACELL® HF is ideal for use in antenna applications.
Technical data
Table 1 of 2
10 rows| Characteristic | Value | Unit | Method |
|---|---|---|---|
| Density | 25 - 90 | kg/m³ | ISO 845 |
| Compressive Strength | 0.4 - 1.5 | MPa | ISO 844 |
| Tensile Strength | 1.0 - 2.8 | MPa | ISO 527-2 |
| Tensile Modulus | 36 - 92 | MPa | ISO 527-2 |
| Elongation (at Break) | 3.5 -4.5 | % | ISO 527-2 |
| Shear Strength | 0.4 - 1.3 | MPa | DIN 53294 |
| Shear Modulus | 13 - 29 | MPa | DIN 53294 |
| Coefficient of Thermal Expansion | 3.23 - 3.34 | 1/K × 10⁻⁵ | — |
| Dielectric Constant | 1.04 - 1.09 | — | — |
| Standard Sheet Thickness (2500 X 1250 mm)* | 1 - 120 | mm | — |
Table 2 of 2
8 rows| Characteristic | Value |
|---|---|
| Ɛ’ (f = 2.5 Ghz) | 1.05 - 1.07 |
| tan δ (f = 2.5 Ghz) | max. 0.0002 |
| Ɛ’ (f = 5 Ghz) | 1.04 - 1.106 |
| tan δ (f = 5 Ghz) | 0.0008 - 0.0016 |
| Ɛ’ (f = 10 Ghz) | 1.04 - 1.10 |
| tan δ (f = 10 Ghz) | 0.0017 - 0.0041 |
| Ɛ’ (f = 26.5 Ghz) | 1.04 - 1.09 |
| tan δ (f = 26.5 Ghz) | 0.0106 - 1.0155 |
