6×4″ Double Sided photo PCB

Microtrak Positive Photoresist FR4 Double Sided. Thickness 1.5mm
High resolution positive photo-resist
Supplied covered with blue light-proof film

Microtrack FR4 boards require a developer strength of 10 to 1. (Not 20 to 1 as with other products it replaces.)
Exposure time is typically 2.5 to 3.5 minutes.