The document discusses green technologies used in printed circuit board (PCB) fabrication. It describes direct metallization processes as alternatives to electroless copper plating that are more environmentally friendly by using fewer chemicals and resources. These include palladium-based, carbon/graphite-based, and conductive polymer-based processes. The document also provides background on PCB manufacturer DaShunChang Electronic and their experience producing various PCB types.

1. PCB Fabrication China Discusses Green Technologies in
PCB Fabrication
Posted on Thursday, July 03, 2014
http://www.sbwire.com/press-releases/pcb-fabrication-china-discusses-green-technologies-in-pcb-fabrication-526527.htm
Shenzhen City, China -- (SBWIRE) -- 07/03/2014 -- “Green― and “environmentally friendly― are ill-defined terms. I
these terms refer to manufacturing that involves the replacement of toxic substances with less toxic materials, the
elimination of materials or processing steps, and less consumption of chemicals (i.e., more efficient or higher yield
processing, reduction of water use, reduction of energy use, less space requirement, smaller equipment foot print, and
recycling and on-site recovery of materials).
Direct Metallization
This family of processes eliminates the electroless copper process. These processes typically have fewer process steps, use
less rinse water, have less floor space requirement, and use less toxic chemicals. Direct metallization processes include:
Palladium-based
These processes pretty much follow the classic electroless copper processing step sequence, except the sequence ends with
the application of the palladium catalyst, followed by the activation, then skips the electroless bath and proceeds to copper
electro-plating.
Carbon or Graphite-based
Using small carbon or graphite particles to render the dielectric hole-wall electro-platable, this process involves very few
steps.
Conductive Polymer-based
The process of using a non-conductive monomer to coat the board surface follows an oxidation step that forms a conductive
polymer from the non-conductive monomer. The polymer then facilitates copper electro-plating on the non-conductive
dielectric hole wall. An example of such a conductive polymer formation is the oxidation of pyrrole to poly-pyrrole, using
permanganate as the oxidation agent. The permanganate is reduced to manganese dioxide, which is insoluble and needs to
be further reduced to the soluble manganese Mn2+ ion. Another example is the polymerization of “EDOT― (3,4-
ethylenedioxy-thiophene) to poly-EDOT
About PCB Manufacturing China
DaShunChang Electronic is a quality oriented PCB manufacturer with 15 year’s experience. Our main products are single
side PCB,double side PCB, multi-layer PCB as well as FPC, Aluminum PCB, High Frequency PCB and Heavy Copper
PCB. Our products are mainly used in areas such as industrial control, medical equipment, automobile electronics,
telecommunication, security products and consumer electronics. You will feel confident of our Printed Circuit Boards every
time. We believe that with our solid Rigid PCB and Flexible PCB, plus competitive price will make us your first choice.
Visit http://www.dsc-pcb.com/about.php for more details.

2. Media Relations Contact
K Yu
CEO
PCB Manufacturer China
http://www.dsc-pcb.com/