Surface treatment chemicals for PWBs
OSP

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

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 is an immersion coating process.

Functions, Demand characteristics

Functions of OSP

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

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

Demand characteristics of OSP (Example)

Excellent solderability

Good example
Good example
Copper surface covered by solder completely
Bad example
Bad example
Exposed copper

OSP coating mechanism / OSP line

OSP coating forming mechanism (Theory)

Excellent solderability

Excellent solderability

Typical OSP process

Typical OSP process
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