How about the circuit board?
Epoxy phenolic glass cloth copper plate surface was light yellow, with good transparency, it has the advantage of good electrical insulation properties, high temperature resistance, chemical resistance, difficult to tide deformation, there are better mechanical properties, but the price relative To be more expensive.
Phenolic paper based copper plate surface is generally black and yellow and light yellow, it has the advantage of cheap, the lack of mechanical strength is low, high temperature performance is poor, easy to tide and deformation.
Substrate surface with a special process of bonding a thickness of about 0.05mm copper foil. If the substrate side of the bonding copper foil, it is called single-sided copper; if the two sides of the substrate are bonded copper foil, known as double-sided copper.
Commonly used copper plate substrate is phenolic paper substrate (paper plate) or epoxy phenolic glass cloth plate, the thickness of 1.0mm, 1.5mm, 2.0mm, 2.5mm?? variety of specifications.
Amateur electronic production using cheap phenolic paper-based copper can meet most of the requirements, but some high-frequency, ultra-high frequency circuit production should choose to use epoxy phenolic glass cloth copper.
