ENGINEERING ANSWER
Material selection for prolonged exposure should include aging behavior and the intended environment. Similar headline dielectric values do not establish equivalent long-term performance across different laminate grades.
What to decide before release
Compare current Rogers guidance for the exact grades and the expected temperature, atmosphere and service life. Where stability is critical, define an accelerated-aging or reliability program appropriate to the finished product.
Checks to put in your design brief
- State exposure conditions
- Use current manufacturer guidance
- Validate the final construction
Important distinction
A nominal Dk match is not sufficient justification for an unrestricted material substitution.
Sources & basis
Material facts follow the cited source. Design checks are preliminary guidance, not supplier process instructions.