01 / Finishes1
Finishes
ENIG, lead-free HASL, OSP, flash gold
Surface Finishes — ENIG, HASL, OSP or Flash Gold?
The finish protects the copper and decides how flat your pads are at assembly. Pick it for the board you are building, not by habit.
Useful details before decorative ones.
02 / Outsourced2
Outsourced
Immersion tin, hard gold plating
03 / Compliance3
Compliance
Lead-free processes
04 / Comparison4
Comparison
Four finishes compared below
05 / Review5
Review
Finish checked against your assembly plan
ENIG
Flat pads for fine-pitch parts. Choose it when pad flatness matters at assembly; it costs more than HASL.
Lead-free HASL
The practical default for general-purpose boards. Solder-coated and robust; the pads are less flat.
OSP
Flat and lean for cost-sensitive boards. Shorter shelf life — plan assembly soon after delivery.
Flash gold
A thin gold finish for designs that specify it. Ask if you are unsure whether your design needs it.
Not sure? Put the finish question in your quote request — we will flag the trade-off for your assembly plan before you commit.
FAQ
Questions buyers ask before they place the order
Still need help? Send us a note and we will point you in the right direction.
Related
PCB Fabrication
Multilayer PCB
Quick-Turn PCB
Stack-Up Guide
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Email your Gerber and drill files to midst_zhong@126.com with layers, thickness, copper, finish and quantity — or start with the form and just the basics. Free engineer DFM check with every quote.