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what is conventional PCB trace thickness?

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pcb trace thickness

Hi, everyone. I have a question about the conventional PCB trace thickness. What is the relationship between the thickness and copper weight, since I saw many PCB manufacture give the specification of copper weight. Thanks.
 

pcb copper thickness

35 um is the standard, what is the connection i don't know, may be this is the weight for 1 sq.in or 10 sq.in ..... but 0.035 mm is the standard.
 
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trace thickness

The thickness of copper clad on a circuit board is usually given in ounces (oz). It is the weight of copper on one square foot of board. One ounce copper is 1.378mils (~35um) thick.

Normal PCB copper thicknesses are 1/4oz, 1/2oz, 1oz, and 2oz. Other thicknesses are possible, depending on the capabilities of the fabricator that makes your board. However, copper that is too thick creates lamination problems.

A typical board would use 1/2oz (.7mil or 18um) copper on inner layers, and 1oz (1.4mil or 35um) copper on planes and outside layers. If the board is thin and high density, thinner copper clad would be used to keep the weight and finished board thickness as small as possible.
 
copper trace thickness

For example, check "FAST LINKS TO TECHNICAL SUPPORT" on this PCB manufacturer:
h**p://www.lab-circuits.com/welcom.htm
 
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