Question Posed:
I am trying to determine if raw-fabricated components (i.e. a Printed Circuit Board without components) can be considered an inseparable assembly (i.e. one that cannot be disassembled by mechanical means) with respect to RoHS or if the solder re-flow layer and the plastic layer have to both be considered individually when determining restricted substance content.
How do I determine the restricted material content in a part that cannot be disassembled by mechanical means?
Answer Provided:
The following answer is drawn directly from the reference included at the bottom of the article.
"The concept of estimating the PCB material content is relatively simple:
- Obtain the layout information for a particular PCB design.
- Use computational geometry to calculate the actual volumes of various parts of the PCB (copper, solder mask, dielectric).
- Gather material data for the various substances present in the PCB.
- Translate volume fractions into weight fractions combining the results from the second and third step."
Layers of PCB that are homogeneous:
- Precious metal surface finish
- Copper
- Polymers (laminate, prepreg, soldermask, legend ink, etc.)"
**Article contents valid as of 2017-06-24
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