4-Layer FR4 PCB Production: ENIG Finish & Custom Stackup Design

4 Layer FR4 PCB Production Record #FR4-20260112-002

FR4 PCB 4 Layers ENIG (Immersion Gold) Impedance Control 0.2mm vias Mass Production

Start FR4 PCB Quote

PCB Specifications

Parameter	Value	Parameter	Value
PCB Type	FR4 PCB	Quantity	300 pcs
Layers	4 Layers	Board Type	Panel PCB
Dimensions	119 x 235 mm	Copper Weight	1oz
Thickness	1.6 mm	Min Track / Spacing	5/5mil
Surface Finish	ENIG (Immersion Gold)	Min Hole Size	0.2mm
Solder Mask	Green	Silkscreen	None
Stack-up	Custom	Impedance Control	No

Manufacturing Timeline

Order Created

Dec 14 00:01

Files Ready

Dec 14 00:01

Engineering Review Completed

Dec 14 00:10

Payment down

Dec 28 03:28

Production Started

Dec 28 03:28

Production Completed

Jan 05 02:46

Progress: 0/6

Engineering Review time: 2 min

Production time: 8.0d

Logistics Information

Production Completed→Shipping : 7.7d

Carrier

DHL

Destination

ITALY

Shipping Method

Express Air

Shipping Time

Jan 12 18:04

Key Manufacturing Processes

Engineering Review

Material Preparation

Inner Layer Imaging

Circuit Imaging & Etching

Layer Stack Alignment

High Pressure Lamination

Solder Mask Application

Electroless Nickel Deposition

Immersion Gold Deposition

Panelization Optimization

Batch AOI Inspection

Yield Control Management

Electrical Testing

Manufacturing Summary

This order consisted of a standard 4-layer FR4 PCB produced with an immersion gold ENIG finish. Material preparation and engineering review preceded the inner layer imaging and precise circuit etching phases, where 6 mil trace width and spacing were maintained using 1 oz copper foil. Following layer stack alignment, high pressure lamination created a robust 1.6 mm thick board with excellent interlayer connections.

Application of solder mask preceded the electroless nickel deposition and immersion gold deposition to form a flat, reliable surface for component assembly. In-process checks including batch AOI inspection supported consistent results across the panels. Comprehensive electrical testing validated circuit continuity and isolation on all units prior to shipment.

Completed over an 8-day production window, the lot demonstrated stable process control from start to finish. The executed steps resulted in boards that meet typical assembly needs while providing good corrosion resistance thanks to the ENIG coating.

Real Production Records

Order ID	PCB Type	Layers	Dimensions	Solder Mask	Surface Finish	Quantity	Action
FR4-20260505-010	FR4 PCB	8	88.4 x 90.2	Green	ENIG (Immersion Gold)	100	View detail
FR4-20260504-094	FR4 PCB	8	281 x 100	Green	ENIG (Immersion Gold)	10	View detail
FR4-20260427-053	FR4 PCB	4	96.1 x 187	Green	ENIG (Immersion Gold)	125	View detail