D-Glass Fabric

- Technical Parameters -

- Heaterk D-glass fiberglass Fabric-

D-glass fiberglass—also referred to as low-dielectric, alkali-free glass fiber—is engineered for advanced electronic and RF composite systems. Compared to standard E-glass (εr ~6.2), D-glass achieves a 50% lower dielectric constant (~3.0) and dramatically reduced dielectric loss (≤0.0025) at high frequencies, enabling superior signal transparency for applications operating between 1 to 40+ GHz.

Heaterks D-glass fiberglass fabric ultra-fine filament diameter (~5–7 μm) supports smooth resin wet-out and uniform fiber-matrix bonding, ideal for producing thin laminates with tight electrical tolerances. Additionally, D-glass demonstrates:

• Low thermal expansion, ensuring dimensional stability
• Radiation resistance, proven in simulated space conditions
• No alkali content, improving chemical stability and aging resistance

In aerospace and defense, D-glass is not intended for primary load-bearing structures, but is widely adopted in non-structural, RF-transparent enclosures where S-glass is over-engineered and E-glass introduces signal distortion.

- Features of Heaterk D-glass Fabric-

• Dielectric constant ~3.0 – ~50% lower than E-glass
• Minimal loss tangent ≤0.0025 at high frequencies
• Stable dielectric behavior from -55°C to +200°C
• Outstanding signal transparency across X-, Ku-, and Ka-bands
• Chemically stable, alkali-free fiber
• Low CTE, compatible with rigid RF substrates
• Excellent radiation resistance for long-term orbital applications
• Lightweight and ideal for non-load-bearing EM-transparent components

- Application Areas -

D-glass fiberglass fabrics are specialized reinforcements for systems requiring minimal dielectric disruption and high-frequency signal transmission:

Aerospace & Avionics

• High-transparency radomes

• Conformal RF structures

• Signal shielding enclosures

Communications

• 5G infrastructure components

• Satellite antennas

• Millimeter-wave reflectors

Electronics

• RF/microwave PCBs

• Low-Dk circuit laminates

• Embedded antenna substrates

Defense & Space

• UAV fairings

• Missile nose cones

• Radiation-hardened composite housings

- Compliance & Standards -

IPC-4412 – Specification for Low-Dk woven glass fabric

ASTM D150 – Dielectric constant and dissipation factor

MIL-STD-810 – Radiation endurance (when qualified)

RoHS / REACH compliant

Cleanroom-ready desized options available for PCB integration

Supplied with thermal, electrical, and mechanical traceability certification upon request