Description
The material used in PCB from top to bottom includes Silkscreen, Soldermask, Copper and Substrate. The last of those layers, substrate, is made of fiberglass and is also known as FR4, with the FR letters standing for “fire retardant.”






Flame Sensor
Adjustable Wrench Spanner
File Set
Mechanzo 12+
Raspberry Pi 3 Model B+
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