Choosing a circuit board factory is a project decision, not a general label. A factory that is suitable for a simple rigid PCB may not be suitable for HDI, rigid-flex, high-layer PCB, or full PCBA work.
Match the factory to the board
The first check is the board type: rigid PCB, FPC, rigid-flex, HDI, high-layer PCB, metal-core PCB, or assembled PCBA. Each type creates different material, process, and inspection requirements.
For assembly-related orders, review PCB fabrication and assembly service checks.
Engineering response is part of capability
Good manufacturing support should identify unclear stackup notes, missing impedance information, unsuitable spacing, material concerns, and assembly risks before production starts.
Broader PCB supplier evaluation criteria can help structure this review.
Process control and inspection
A buyer should ask how the factory controls drilling, plating, etching, solder mask, surface finish, electrical test, and final inspection for the specific board type. Generic quality claims are not enough.
Process-control context is also covered in PCB manufacturing and Industry 4.0.
What to send with the RFQ
Send Gerber files, drill files, stackup, BOM if assembly is needed, special notes, target quantity, delivery expectation, and test requirements. Clear input reduces back-and-forth and makes the quotation easier to compare.