CuClad laminates are woven-fiberglass-reinforced PTFE composites. Within the family, fiberglass-to-PTFE balance is part of the electrical and mechanical tradeoff, so selection needs more than a single nominal dielectric constant.
Choose the balance deliberately
CuClad 217, CuClad 233 and CuClad 250 represent different reinforcement balances. A low-Dk candidate may suit a radiator geometry, while a more reinforced construction may better fit handling and dimensional needs. Check the exact offered Dk option rather than assuming every panel sold under one grade has an identical specification.
Orientation and form matter
Woven reinforcement makes material orientation worth documenting in a phase-sensitive layout. For a large board or radome-related structure, review thickness uniformity, support points and dimensional changes during processing. Ask how the supplier defines sheet directions and preserve that convention in any registration or test records.
Separate laminate from bonding film
The CuClad name also appears on 6250 and 6700 bonding films. These have a different role from the copper-clad core. The final circuit model must reflect the dielectric that actually occupies each layer. Use the bonding guide to review processing and service-temperature requirements before choosing an adhesive solely for a similar Dk.
References in this family
Keep reinforcement, sheet direction and bonding roles visible in the CuClad selection record.