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Ask the Experts Member | 
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 Mahendra GandhiSME - PWB Technologies Northrop Grumman  | 
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			Mahendra Gandhi has been working in interconnect industry since 1972.
			 
			Mahendra Gandhi has submitted responses to the following questions.
			 
				
			
						
			Exposed Copper Risk 
						Yes! ... 
			How to Eliminate Via Pits 
						Solder paste are not designed/developed as a via fill materials and should not be used as a via fill. ... 
			Improve DPPM for Wave Soldering Using Nitrogen 
						Itwill improve but not eliminate. ... 
			Conformal Coating in Low Humidity Environments 
						Not if it is fully cured. ... 
			Flux Oozing from Insulated Wires 
						Capillary action during first tinning. ... 
			Gold Plated Hole Defects 
						Have the board fabricated with solder coating in the holes... and avoid removing gold from the holes. ... 
			HASL vs. Immersion Gold 
			
			
			
			Do you recommend use of HASL vs. immersion gold for our application? Yes. Would you recommend another type of finish? ...  | 
			
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