ALPHA Assembly Solutions TechPaper: In House Dross Recovery – Do you know what you are putting back in your solder bath?


In House Dross Recovery –

Do you know what you are putting back in your solder bath?  

Mitch Holtzer and Jason Fullerton

Alpha Assembly Solutions – South Plainfield, NJ, USA


Over the last 3 years, several large OEMs and CEMs have purchased inexpensive equipment to melt entrapped metal from solder dross skimmings, and returning this material to their wave soldering or selective soldering systems. This results in a significant reduction in the volume of bar solder consumed. With the still increasing trend towards lead free utilization and higher pot temperatures, dross management becomes a greater issue.

In this process, small ingots of solder are produced by using pressure to separate liquid metal from the oxide/metal mixture skimmed from the solder bath. After the entrapped metal is removed, the remaining oxides are returned to solder suppliers for further recovery.

Analysis of these ingots show that there is a significant change in the ratio of tin/silver in SAC alloys, and the ratio of tin/lead in Sn63 alloys. This means that the ratio of tin to silver and tin to lead may be changing in the wave or selective soldering pots. Analysis of the amount of dross included in the ingots produced using this method was compared to a number of commercially available brands of bar solder. Data indicates that the lack of post treatment of this recycled material results in an order of magnitude increase in the amount of included more!

Download this complimentary white paper to learn more

 Screen Shot 2017-03-08 at 9.04.59 AM.png Screen Shot 2017-03-08 at 9.05.09 AM.png  Screen Shot 2017-03-08 at 9.05.19 AM.png
Screen Shot 2017-03-08 at 9.05.27 AM.png Screen Shot 2017-03-08 at 9.05.48 AM.png Screen Shot 2017-03-08 at 9.06.01 AM.png

Alpha Assembly Solutions TechPaper Report brought to you by
Trafalgar Publications Ltd.  / Global SMT & Packaging
Crown House  •  72 Hammersmith Rd  •  Hammersmith  •  London, W14 8TH •  UK   

 For information on featuring your company in the TechPaper Report, contact


International Director of Sales – Americas
Sandy Daneau
Tel: (239) 234-1600
skype: sdaneau.1

European Sales and Customer Support
Joanne Galbraith
Tel: +44 (0) 207 559 1467
Fax: +44 (0) 207 559 1468
UK Mobile: +44 (0)141 628 9200
Skype: jgalbraith1965

Southeast Asia – India, Singapore, Korea & Malaysia

India, Singapore, Korea & Malaysia
Anupreet Singh Jaggi
M 7 Creations
Tel: +91 8130068308
skype: anupreetjaggi

China, Taiwan, Japan & Hong Kong 
Paul Chen
Tel: +86 2154049130








Start typing and press Enter to search