Does anybody know what are the drawbacks of using a paper phenolic
based pcb on a simple circuit design?

"Obelix" wrote in message
m...
Does anybody know what are the drawbacks of using a paper phenolic
based pcb on a simple circuit design?

Paper phenolic is used in imported electronic equipment because the holes in
those boards are punched in a single operation. Holes cannot be punched into
epoxy boards; they have to be individually drilled by a CNC machine.

Paper does not lend itself to fine laminations the way glass epoxy does.
Therefore, multilayer boards are impractical. Ground planes cannot be
incorporated.

Paper is not as fire retardant as epoxy.

Epoxy is much stronger. Epoxy boards with plated-through eyelets can
reliably mount interface connectors that tend to break off when mounted on
paper boards.

If you're having a small number of boards made, you will not see the entire
cost advantage of paper, because one step hole punching is not done, AFAIK,
by any domestic board manufacturers.

Thanks for the detailed response.

"Robert Morein" wrote in message ...
"Obelix" wrote in message
m...
Does anybody know what are the drawbacks of using a paper phenolic
based pcb on a simple circuit design?

Paper phenolic is used in imported electronic equipment because the holes in
those boards are punched in a single operation. Holes cannot be punched into
epoxy boards; they have to be individually drilled by a CNC machine.

Paper does not lend itself to fine laminations the way glass epoxy does.
Therefore, multilayer boards are impractical. Ground planes cannot be
incorporated.

Paper is not as fire retardant as epoxy.

Epoxy is much stronger. Epoxy boards with plated-through eyelets can
reliably mount interface connectors that tend to break off when mounted on
paper boards.

If you're having a small number of boards made, you will not see the entire
cost advantage of paper, because one step hole punching is not done, AFAIK,
by any domestic board manufacturers.


Hi

Paper board is much weaker.
paper board is prone to delaminating
paper board burns when hand soldered
tracks come unglued and break when parts are desoldered.
It isnt much used because it introduces some unreliability.

Regards, NT

This technology is known as punch & crunch for obvious reasons. There is
usually an issue with adding solder resist also and the board has to be
cured first before a mask can be added (IIRC).

positives: Cheap

very good for high volume - tooling is expensive [hard tool setup]

negative: not very good in humid environments (absorbant)

cracks/shears easily

glues don't bond copper as well to this material (ie reworkability sucks)



"Robert Morein" wrote in message
...

"Obelix" wrote in message
m...
Does anybody know what are the drawbacks of using a paper phenolic
based pcb on a simple circuit design?

Paper phenolic is used in imported electronic equipment because the holes
in
those boards are punched in a single operation. Holes cannot be punched
into
epoxy boards; they have to be individually drilled by a CNC machine.

Paper does not lend itself to fine laminations the way glass epoxy does.
Therefore, multilayer boards are impractical. Ground planes cannot be
incorporated.

Paper is not as fire retardant as epoxy.

Epoxy is much stronger. Epoxy boards with plated-through eyelets can
reliably mount interface connectors that tend to break off when mounted on
paper boards.

If you're having a small number of boards made, you will not see the
entire
cost advantage of paper, because one step hole punching is not done,
AFAIK,
by any domestic board manufacturers.