PCB-B-24
Test Boards for Cleanliness and Conformal Coating PCB-B-24 Standard Test Board
The PCB-B-24 standard test board is compliant with the IPC Phase 3 cleaning and cleanliness test program. It was designed to be a vehicle for examining the interactions between laminate, surface metalizations, and fluxes. It is the primary qualification vehicle for ANSI J-STD-004, which is the IPC specification on fluxes.
The four comb patterns are identical and have 16 mil lines and 20 mil space. These values were chosen both for ease of stencil printing solder paste, and the board can be wave soldered with minimal chance of solder bridging.
The PCB-B-24 test board is an excellent vehicle for narrowing down fluxes or solder material, or testing material interaction.
PCB-B-25A
PCB-B-25A Standard Test Board
The PCB-B-25A test board meets the current guidelines for solder Masks (IPC-SM-804C) and conformal coatings (IPC-CC-830A).
The board is normally 0.062" FR-4. The board is simple print-and-etch. The surface is bare copper for materials qualification, but could be any Surface finish required.
The PCB-B-25A is used to evaluate interactions between solder masks, solder paste, and fluxes.
PCB-B-36 Standard Test Assembly PCB-B-36
The PCB-B-36 standard test board was designed for the IPC cleaning cleanliness test program, Phase 1. It was designed for examining the ability of a cleaning solvent to remove flux residues, and to examine the effects of entrapped residues under low standoff components. The PCB-B-36 test board can be used as a process qualification vehicle for the J-STD-001. This board has 10 SIR test patterns. Two patterns #2 and #4 are mounting pads in quadrants C and D. The pad spacing is 25 mils for patterns #2 and #4. The contact fingers of the board are normally gold plated for compatibility with edge card connectors. The remaining metal- lization is normally bare copper, or any surface finish. In most cases, four leadless ceramic chip carriers (LCCs) are mounted on the board, one in each quadrant.
This test vehicle is designed to test combinations of conformal coatings, fluxes, solder paste and their interactions with each other. Testing clean- ing residue under low stand off components is a benefit of the PCB-B-36 test board.
Practical Components, Inc. Tel: 1-714-252-0010 Fax: 1-714-252-0026 85
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