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August 2004

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Subject:
From:
Guenter Grossmann <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Guenter Grossmann <[log in to unmask]>
Date:
Thu, 26 Aug 2004 09:13:47 +0200
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Victor

Lead free solder in a wave solder machine does solve a lot of copper from a PCB. Trials that where done at ERSA with a solder pot temperature of 275°C and a conveyor speed of 1m/min showed that approx. 12um of copper have been eaten away from a SMD pad. The only way to avoid this is to lower the temperature as far as possible. The lowest wave temperature we where able to solder through hole on a 4 layer FR4 with 2 fully metallised inner layers was 245°C; 1m/min with SnAgCu. However, this is was the lowest limit. We settled now on 250- 255°C for a pilot production.

Best regards

Guenter

EMPA
Swiss Federal Laboratories  for Materials Testing and Research
Centre for Reliability
Guenter Grossmann,  Senior Engineer

8600 Duebendorf
Switzerland

Phone: xx41 1 823 4279
Fax :     xx41 1 823 4054
mail:     [log in to unmask]

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