Determination of Dielectric Constant and Copper Thickness of Printed Circuit Boards

Dielectric constant is known as Relative permittivity ( ). Despite of its natural dielectric permittivity, dielectric and frequency in temperature changes may be induced by an electric field.
 
Since the dielectric constant is just a ratio of two similar quantities, it is dimensionless. Depending on the materials and model number of a prepreg, dielectric constant may differ. If you have an actual demand, please contact our sales representative for more information.
 
Copper Thickness
Copper thickness is measured the same as line width. However, it has the ability to affect PCB’s actual carrying capacity. For example, a PCB with a wider width may carry a greater capacity; a PCB with a thicker copper may also carry a greater capacity.
 
For your information, some of the examples of materials are shown below in the table:

Copper Thickness 1.0 oz=35um		Copper Thickness  1.5 oz=50um		Copper Thickness  2.0 oz=70um
Line Width (mil)	Electric Current (A)	Line Width (mil)	Electric Current (A)	Line Width (mil)	Electric Current (A)
100	4.5	100	5.1	100	6
80	4	80	4.3	80	5.1
60	3.2	60	3.5	60	4.2
48	2.7	48	3	48	3.6
40	2.3	40	2.6	40	3.2
32	2.0	32	2.4	32	2.8
24	1.6	24	1.9	24	2.3
20	1.35	20	1.7	20	2
16	1.1	16	1.35	16	1.7
12	0.8	12	1.1	12	1.3
8	0.55	8	0.7	8	0.9
6	0.2	6	0.5	6	0.7
The above data is determined by the current carrying value with a temperature of 25℃ and below.
Unit conversion: 1mm=39.37mil (or 1mm=40mil)  For other unit conversions, please refer to FAQS

In general, a layout design will have a standard rate of 1.0oz copper thickness, 40Mil line width, and is capacitive high current 1A.
In other words, a 1.0oz copper thickness, 40Mil line width is capacitive high current 0.5A; a 2.0oz copper thickness, 40mil line width is capacitive high current 2A.

The above mentioned are FYI, thank you.