Organic Solderability Preservatives Compare with Silver or Tin surface finish

Compare with Silver or Tin surface finish.
The OSP surface finish board has many different factors.

If you are familiar with Chemical theories.
You must know the Silver or the Tin material have a perfect performance.
But this feature also occurs when assembly components to surface finish boards.
This is the reason why so difficult use normal method assembly Silver or Tin surface finish.
Just because the Silver Surface finish or Tin Surface Finish have formed an intermetalic layer.
Unlike silver or tin the OSP doesn't form an intermetalic layer.

And the second different factor is the shelf life.
All electronic companies care about the OSP board's shelf life.
This also means the cost of PCB project.
This factor also related to first chemical theories.
Because the OSP surface finish doesn't have intimately layer.
The results in the short shelf life with OSP surface finish boards.

Then the third difference is solderability.
This factor also is mainly part of the PCB's performance.
If your boards have good solderability.
You purchase PCB order may high quality circuit boards.
So if you board is very low quality, and low performance.
Most of the time is saying PCBs' solderability.

In fact, the solderbility of OSP finish board not the best.
But it also can use most electronic products.
Even poor solderability of the other metallic finishes.

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Organic Solderability Preservatives PCBs' advtantages

Why so many companies choose OSP park PCB?
This question related to many factors.
Jim just wants to discuss the OSP park PCB factors.
Other factors like China PCB or HTD circuits advantages were exclusive.
(In fact there were many oversea customers during to above two reason buy OSP park PCB from 
China.)

Effect OSP park PCB factors must be the advantage its.
First reason Jim wants to list technological grown.
IF you have experience of PCB manufacturing.
You may notice this change happen in every PCB fabrication.
Organic Solderability Preservative's have made great progress in recent years. 

Second factor is the solder capability of OSP printed circuit boards.
Not every company like IMB to research the first OSP PCBs.
(More about the first use OSP PCB in PCB industry, Please go back to read.)
But if most PCB manufacturers can produce this kind OSP PCB.
I mean the price is accepted by most companies.
This situation will become more popular.
It's depended on the solder ability of OSP park PCBs.
They are now capable of multiple solder passes.

The third factor is the shelf life of OSP park PCB becomes more long.
The shelf life of OSP park PCB is very important.
Because this factor related to the loading time of the project.
So OSP park PCB has probably the longest shelf life of all the seated ROHS compliant lead free finishes.