Ask the Experts
August 31, 2011 - Updated
August 28, 2011 - Originally Posted

Re-qualifying Cored Wire Solder

Is there a process for re-qualifying cored wire solder that has passed the expiration date?

P. G.

Expert Panel Responses

Always a tricky one, in theory there is nothing in the solder wire that can go off so the expiration date could be just a logistic function. How ever depending on the field you are working in it could be possible to see if it is still useable, in some industries you will have to abide by the use by date. If you can use material then a quick easy test is to see how it solders to a flat copper strip or coupon. Make sure the copper is clear of oxide by using a mild acid wash or abrasive clean. The wash in alcohol to make sure it is clean and free of oils. Put a known weight or length of the wire screwed up into a ball on the copper and heat it up. This is best done on a solder bath (float and a static part of a wave solder machine) or hot plate, but any controlled heating method will do. If the solder spreads out giving a uniform and relatively flat silver circle then the wire is probably OK. If it form a lump or ball then it is probably not so good

Richard Boyle
Global Product Champion
Henkel Electronics
Richard Boyle is a Global Product Champion at Henkel Electronics. He has over 25 years experience in the electronics assembly industry and is responsible for the global technical service of all of Henkel's solder materials.
Submit A Comment

Comments are reviewed prior to posting. You must include your full name to have your comments posted. We will not post your email address.

Your Name

Your Company
Your E-mail

Your Country
Your Comments

Free Newsletter Subscription
Circuitnet is built for professionals who bear the responsibility of looking ahead, imagining the future, and preparing for it.

Insert Your Email Address