IsoClad uses non-woven fiberglass reinforcement in PTFE. It offers a different reinforcement architecture from woven-glass families, which makes it worth evaluating where dielectric behavior, handling and physical form interact.
Start with the reinforcement tradeoff
IsoClad 917 uses a lower glass-to-PTFE ratio than IsoClad 933. The latter’s stronger reinforcement emphasis is relevant to dimensional and mechanical needs. Compare the published construction details rather than assuming that a non-woven material behaves exactly like a woven laminate with the same nominal Dk.
Use the actual mounting geometry
For an antenna or shaped structure, check how the board is supported and what strain occurs during installation. A material family’s suitability for a broad application is not approval for an arbitrary bend radius or forming process. Define the shape, allowable springback, conductor orientation and environmental exposure, then obtain a supported processing approach.
Verify after fabrication and installation
Measure a representative circuit before and after its final mechanical installation. Record dimensional change, connection condition and RF response. A flat test coupon alone may miss the behavior of the intended assembly. Include copper and thickness in the RF model, and use the PTFE fabrication guide to structure questions on drilling, plating and handling.
References in this family
Treat non-woven reinforcement as a design variable and validate the final mechanical form as well as the flat circuit.