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May 2008

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Subject:
From:
Ioan Tempea <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ioan Tempea <[log in to unmask]>
Date:
Wed, 21 May 2008 08:13:11 -0400
Content-Type:
text/plain
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text/plain (83 lines)
Dan,

You've got some fine answers to the meaning of your question, but I
would like to check the reason of it.

What do you actually want to do? Estimate the contamination from paste
and non-RoHS components and see if you are within 0.1% Pb? If so, forget
it, this is precisely not how you assess RoHS compliance!

The contamination is checked on homogeneous material; to simplify it, if
one joint has more than 0.1% Pb, from let's say touch-up with the wrong
wire or from non-compliant finish of one component, the product is not
RoHS, regardless of the condition of all the other spots on the board
and the overall Pb percentage.

If I misinterpreted your intent, my apologies and please carry on in
your quest.

Regards,

Ioan


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dan Mathews
Sent: Tuesday, May 20, 2008 12:10 PM
To: [log in to unmask]
Subject: [TN] Average paste volume estimate

 Does anyone have an easy way to estimate how much paste is applied to a
smt pcb? I understand it varies on 

squeegee pressure, stencil thickness, and pitch of the components but I
was looking for an average. I would

assume that somewhere out there someone can estimate that "2 grams of
paste is used on a 2" x 2" smt pcb". 

 

 I will then use this information to determine how much lead is used on
non-RoHS products due to solder paste 

issues and not non-compliant components. 

 

Thank You in Advance,

Dan

 

Dan Mathews C.I.D.+

Engineering Support Supervisor

B&B Electronics

Ottawa, IL USA 61350

Phone: 815-433-5100 ext 217

Fax: 815-434-8831 (direct to my desk)

URL: http://www.bb-elec.com <http://www.bb-elec.com/> 

 

 

 

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