ENGINEERING ANSWER
Reliable plated holes depend on preparation, copper deposition, geometry and thermal exposure. RO4000 materials support familiar PCB processing, but that does not remove the need to qualify the actual hole structure and process.
What to decide before release
Specify required finished hole dimensions and any acceptance class or inspection standard agreed for the product. Use the supplier’s recommended construction for challenging aspect ratios rather than prescribing an unverified process sequence.
Checks to put in your design brief
- Align drill and plating allowances
- Review thermal cycling requirements
- Request relevant inspection evidence
Important distinction
A laminate’s low Z-axis expansion is helpful but does not alone guarantee via reliability.
Sources & basis
Material facts follow the cited source. Design checks are preliminary guidance, not supplier process instructions.