PTFE composites need a material-specific fabrication route. A successful thermoset process is useful experience, but it does not by itself establish how a PTFE core, its filler and its bonding system should be drilled, prepared and plated.
Start with the actual stack
Identify every core and adhesive, the hole diameters, total thickness and the smallest critical features. The official RO3000/RO3200 guide distinguishes reinforced and unreinforced constructions and discusses handling support. Thin, soft cores can be damaged during transport or surface preparation before drilling begins. Ask how panel support and registration are maintained through the selected process.
Review drilling and hole preparation separately
Drill quality depends on the tool, entry and backing materials, stack, speed, feed and tool condition. Hole preparation then addresses debris, the exposed material surface and any adhesive-specific desmear needs before metallization. The appropriate procedure depends on the exact material system; avoid a blanket instruction that every PTFE board needs the same chemical or plasma recipe. Obtain the supported procedure from the current fabrication guidance and the responsible process engineer.
Example: a hybrid board with clean cores but poor holes
A drilling process may look acceptable on a double-sided core while a multilayer version contains adhesive residues or a different hole-wall profile. Qualify the complete stack, including the bonding layers. Use representative hole sizes and inspect cross-sections after metallization. Inspect the plated structure rather than judging tool life solely by the visible sharpness of a removed drill.
Agree evidence before production
Ask for material and lot traceability, a documented hole-preparation route, and inspection criteria matched to the project. Include representative thermal exposure if plated-hole reliability is part of the requirement. Specify how deviations or substitutions are approved. The test-planning guide connects these controls to acceptance. For RO3000/RO3200, CLTE or RT/duroid, use the applicable guide rather than transferring numeric settings across families. This article is a review framework, not an operator’s chemical-processing recipe.
Before accepting a trial build, confirm that the inspected coupons represent the smallest holes and most difficult adhesive interfaces in the actual design. Easy large holes alone may leave the critical processing question unanswered.
Qualify drilling, preparation and plating on the complete PTFE stack you intend to manufacture.