I believe the intent of the legislation is that the PCB finish and the
component finish should be lead-free. The issue of components and exemption
from the legislation as we know was and is related to the high temperature
solders inside the parts.

Anyway we all also know of the issues of trace lead on the component
termination leading to secondary reflow. This is being examined by one the
NPL projects due to be complete in Feb/March 2005. This looks at the issue
of reliability and processability. If you have the possibility of secondary
reflow you will not be able to get the products out the factory door to be
unreliable in the field.


Bob Willis
2 Fourth Ave, Chelmsford,
Essex, CM1 4HA, England
Tel: 01245 351502
Fax: 01245 496123
Mobile: 07860 775858
Email: [log in to unmask]
Web: www.leadfreesoldering.com
Web: www.bobwillis.co.uk
 

-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Tracey Christiansen
Sent: 18 November 2004 18:06
To: [log in to unmask]
Subject: [LF] Lead in electrical component finishes

I need help with an interpretation of exemption Number 7 in the ROHS annex
regarding servers.

The exemption reads:
"- lead in solders for servers, storage and storage array systems (exemption
granted until 2010)"

The annex does not just say "lead" -- it says "lead in solders".  Therefore,
there is an opinion that only lead used in solder is considered exempt
(until 2010).  Lead used elsewhere (such as in component finishes) is not
exempt.

I have read a DTI guidance document - July 2004 that suggests that solder is
defined as "alloys used to create metallurgical bonds between two or more
metal surfaces to achieve an electrical or physical connection."  The same
document also states that their interpretation is that the exemption applies
to the whole of the finished device to include components (where
metallurgical bonds are created).  With this in mind, we have now formed a
different opinion that component finishes can fall within the exemption.

Would anyone on this forum like to offer an opinion on which interpretation
is compliant with the exemption?

Thanks for your consideration of my dilemma,

Tracey C


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