ENGINEERING ANSWER
RO4350B LoPro uses a modified bonding construction with reverse-treated foil to reduce conductor-related loss. It should be specified as an exact material/foil system, not assumed interchangeable with standard RO4350B at the same nominal core thickness.
What to decide before release
Check the additional construction thickness, model assumptions and applicable flammability qualification. The cited sheet notes that LoPro does not share the standard laminate’s UL designation and that separate qualification may be necessary.
Checks to put in your design brief
- Order the exact LoPro designation
- Request the finished dielectric construction
- Verify the required qualification
Important distinction
Do not substitute a low-profile foil description for a complete Rogers material part description.
Sources & basis
Material facts follow the cited source. Design checks are preliminary guidance, not supplier process instructions.