Organic Solderability Preservative Final Finish for Printed Circuit Boards
Aspect is an organic solderability preservative developed for high temperature processing in Pb-free assembly. It is compatible with through-hole and surface mount technology. It can be used for mixed final finish, ENIG/OSP applications.
Aspect is supplied in three concentrated components, two for bath make-up and an additional component for non-regular replenishment. It contains a substituted imidazole, acetic acid and is Cu-free. Treated Cu surfaces are covered with a thin (0.2 – 0.4 micron), nearly colorless and transparent coating.
Aspect is used in a standard immersion line incorporating the chemical steps of Cleaner, Microetch, and OSP with counterflow rinses in between. Rinsing and drying between each step will prevent variations in coating thickness. It is recommended to use an acidic cleaner appropriate for a final finish, such as FinClean CR or FinClean RS from RBP, as well as a peroxide-based microetch as this chemistry creates a better surface topography for coating formation. Peroxide microetch chemistry is also more easily rinsed.
An example of such microetch is Quantum Etch from RBP. Aspect bath make-up instructions are provided in the data sheets below.
Acidic solution used to clean metal surfaces. VersaCLEAN 470 removes metal oxides,
light oils and other organic contaminants. It is supplied in concentrated form and should be
diluted with water, as specified below. VersaCLEAN 470 can be followed by a microetch to
achieve increased adhesion when needed.
An alkaline cleaner for use in the LAYERBOND 2000 adhesion promoter process. PREPBOND provides complete surface preparation for this process, eliminating the need for a microetch. It completely removes residues from Resist Stripper, and is extremely effective for removing handling soils and fingerprints. For spray, flood and soak applications.