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chemicals

What's OSP

OSP coating protects copper surface from oxidation to keep excellent solderability and plays a prominent role in component mounting process.

Basic information
Functions, Demand characteristics
OSP coating mechanism / OSP line

Components

  • Imidazole derivative
  • Copper ion
  • Organic acid
  • Water

OSP coating

OSP is an immersion coating process.
After 30 to 90 sec immersion, 0.2 to 0.3um thickness OSP coating forms on copper surface.

OSP coating

Functions of OSP

By Keeping excellent solderability, OSP acts as a bridge between PWB manufactures and assembly manufactures.

Functions of OSP

Demand characteristics of OSP (Example)

Excellent solderability

Demand characteristics of OSP (Example) Good example
Good example
Copper surface covered by solder completely
Demand characteristics of OSP (Example) Bad example
Bad example
Exposed copper

OSP coating forming mechanism (Theory)

Excellent solderability

OSP coating foaming mechanism (Theory)

Typical OSP process

Typical OSP process

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