Conversion Formula of Common Units of PCB Circuit Board

1 foot=12 inches
1 inch=1000 mils
1mil=25.4um
1mil=1000uin mil, sometimes also in English
1um=40uin (some companies refer to micro inches as wheat, but they actually refer to micro inches)
1OZ=28.35 grams per square foot=35 microns
H=18 microns
T=12 microns
4mil/4mil=0.1mm/0.1mm line width/line spacing
1ASD=1 ampere per square decimeter=10.76 amperes per square foot (ASF)
1AM=1 ampere minute=60 coulombs, mainly used for precious metal electroplating such as gold plating
1 square decimeter=10.76 square feet
1 ounce=28.35 grams, which is in Imperial units
1 gallon (imperial)=4.5 liters
1 gallon US=3.785 liters
1KHA=1000 ampere hours
1 Ampere-hour=3600 coulombs
proportion
Baume degree=145-145/specific gravity SG
SG. Specific gravity (g/cm3)=145/(145 Baume degrees)

Reechas is a high-tech enterprise founded in 2006 and headquartered in Shenzhen, China. We focus on the development, production, and sales of integrated laminating products, including release films, conformal films, and press pads. These products are widely usedin PCB, FPC,  rigid-flex PCB, 5G PCB, IC substrate, CCL, smart card, copper coin & heat-sink and other industries.