Using a Gerber software package and the CAD files you can get the area
of the stencil layers of each board style. Knowing the thickness and
area and density of solder paste you can determine the volume of paste-
most pastes are 50 pbw. Assume that paste transfer is complete.

(Stencil area x stencil thickness)/ solder paste density = gms of solder
paste

First pass approximation but there are so many variations in area and
board size that if makes it difficult to come up with an average value.

Tom

-----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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