The following tables provide an overview of our 4 and 6 layer PCB constructions.  All core and prepreg materials are FR-4 laminates.  Additional information can be found on our materials can be found on Manufacturing Capabilities.  If you need any additional information, please contact us by chat or e-mail: support@expresspcb.com.

4 Layer MLB 0.062″ Thickness

Silkscreen	White Epoxy Based
Soldermask	Green, LPI
Copper Plate	0.0008″ min avg in holes
Layer 1	Copper Foil	1/2oz
Prepreg	0.0141″
Layer 2	Copper	1oz
Core	.028″
Layer 3	Copper	1oz
Prepreg	0.0141″
Layer 4	Copper Foil	1/2 oz
Copper Plate	0.0008″ min avg in holes
Soldermask	Green, LPI
Silkscreen	White, Epoxy based

6 Layer MLB 0.062″ Thickness