You are comparing apples to oranges. No-clean fluxes, because they are designed not to be cleaned off after reflow, contain very low solids. Normally, no-cleans have a solids content of 2% - 5%. Your basic RMA has a solids content of 15% to 30% (some, even as high as 60%).
A 2% - 5% solids flux, will not leave behind the sticky, gooey, resin that an RMA will (although it will leave behind other forms of contamination). RMA is by nature, designed to be cleaned off after reflow. If your customer is specifying RMA, they are assuming that you are cleaning the board. Otherwise, the boards may also be used as fly-paper.
You only have two choices.
# 1: Talk the customer into no-clean. # 2: If using RMA (or OA), clean the boards before testing.
Mike (909) 944-7771 www.aqueoustech.com
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