Immersion silver creates a silver surface on designated copper features. Review it against the assembly process and the expected environment, including storage before assembly. Surface condition can be affected by handling and exposure, so packaging and lot control belong in the finish decision.
Check the assembly requirement
Identify fine-pitch pads, large exposed pads and any surfaces used for testing or contact. Confirm compatibility with the selected soldering materials and sequence. Use the fabricator’s qualified finish and the assembler’s actual process conditions in the assessment.
Plan packaging and handling
Define how boards are protected in shipment and after opening. Limit unnecessary contact with finished surfaces and preserve the agreed storage environment. When appearance changes, investigate the exposure history and acceptance criteria instead of making a solderability decision from color alone.
Consider the service environment
Review humidity, contaminants and electrical conditions relevant to the product. Product-specific environmental evaluation may be needed when the finish or assembly operates in demanding conditions. The board finish should be considered together with cleaning, coating and enclosure protection.
Keep procurement requirements precise
State the finish, governing acceptance requirements, lot records and any special packaging. Identify whether another finish may be substituted and who approves that change. A different metallic finish can alter both the assembly process and the electrical surface structure.
Release checklist
- Confirm soldering and test compatibility.
- Agree packaging and storage controls.
- Review relevant environmental exposure.
- Record finish identity and permitted alternatives.