Knowde Enhanced TDS
Identification & Functionality
- Core Type
- Composite Materials Functions
- Technologies
- Product Families
Features & Benefits
- Labeling Claims
- 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).
- 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.
Applications & Uses
- Applications
- Composites End Use
- Composites Processing Methods
- 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.
- Recommended Application
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.
Properties
- Typical Properties
- Dielectric Properties
- Note
* Thickness tolerance +/- 0.2 mm, other tolerances available on request. 1-4 mm thick sheets supplied in ¼ or ½ sheet size.
| Value | Units | Test Method / Conditions | |
| 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 | — |
| Value | Units | Test Method / Conditions | |
| 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 | — | — |