RT/duroid 5870 is a glass microfiber-reinforced PTFE composite engineered specifically for high-precision stripline and microstrip circuit implementations.

The material’s randomly oriented microfiber architecture delivers exceptional dielectric constant (Dk) uniformity—a characteristic that ensures consistent Dk values not only across individual panels, but also over a broad operating frequency spectrum. Combined with its inherently low dissipation factor (Df), this attribute extends the material’s applicability to Ku-band and higher-frequency systems.

RT/duroid 5870 laminates exhibit outstanding machinability, enabling straightforward cutting, shearing, and precision shaping. Furthermore, the composite demonstrates robust resistance to all solvents and chemical reagents—whether hot or cold—commonly utilized in printed circuit etching, as well as edge and through-hole plating processes.

As a standard offering, RT/duroid 5870 is supplied as double-sided copper-clad laminates, featuring electrodeposited copper (EDC) with a thickness range of ½–2 oz/ft² (8–70 µm) or reverse-treated EDC variants. For applications demanding more stringent electrical performance, the composite can also be clad with rolled copper foil. Custom cladding options, including aluminum, copper, or brass plate, are available upon specification.

Critical Notes for Ordering: To ensure accurate fulfillment, orders for RT/duroid 5870 laminates must clearly specify the following parameters: dielectric thickness and corresponding tolerance, copper foil type (rolled, electrodeposited, or reverse-treated EDC), and required copper foil weight.

Key Features

• Industry-leading low electrical loss among reinforced PTFE materials
• Minimal moisture absorption
• Isotropic material characteristics
• Consistent electrical performance across a broad frequency range
• Superior chemical resistance

Typical Applications

• Commercial aviation broadband antennas
• Microstrip and stripline circuits
• Millimeter-wave systems
• Military radar systems
• Missile guidance systems
• Point-to-point digital radio antennas