GF
D2 Low-Dielectric Fiber Yarn
Nippon Electric Glass ? LOW-DK
Manufacturer page / TDSDescription
Glass family: Low-Dk / D2. Product form: Yarn. Scope: Electrical/high-frequency composite reinforcement. Current official product-list entry.. Official source: GF-NEG-FIBER
Comparative overview
Glass fiber — Low-dielectric glass
Strengths: Combines useful structural reinforcement with low dielectric constant/loss and electrical insulation.
When to use: Select for radomes, antennas, RF windows, printed-circuit laminates and electromagnetic-transparent fairings.
Key tradeoffs: Lower specific stiffness than carbon and more expensive/less available than ordinary E-glass; RF performance remains frequency-, resin- and thickness-dependent.
Qualitative ratings (1–10 scale)
| Relative cost | 7/10 — High — special chemistry and lower-volume production for controlled dielectric constant/loss. |
|---|---|
| EM transparency | 10/10 — Exceptional — excellent RF transparency and signal integrity; purpose-designed for low dielectric loss. |
| Temperature / fire resistance | 7/10 — Very good — non-combustible but not a hot-section ceramic; temperature rating is below silica/quartz. |
| Impact / penetration resistance | 5/10 — Moderate — moderate impact capability; dielectric optimization can trade against mechanical robustness. |
| Electrical / thermal conductivity | 1/10 — Very low — electrically insulating with low thermal conductivity. |
| Specific tensile strength | 5/10 — 5/10 | 1347.8 kN·m/kg | Class median |
| Atmospheric durability | 8/10 — Very good — low-dielectric glass is UV-stable and electrically inert; moisture effects are mainly associated with sizing and laminate interfaces. |
| Sustainability (CO₂e) | 8/10 — 2.20 kg CO₂e/kg fiber — Low emissions — data quality: Low |
Technical properties
Applications and processing
Composite reinforcement according to product form