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Subject:
From:
Karen Tellefsen <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Karen Tellefsen <[log in to unmask]>
Date:
Fri, 18 Sep 2009 16:15:24 -0400
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text/plain (315 lines)
Alpha fluxes do not contain hydrazine, even those that contain HBr, such as
857.  I don't know about other assembly flux manufacturers, but I'd doubt
most of them would include it without listing it on an MSDS.

Karen Tellefsen - Electrical Testing
[log in to unmask]




                                                                           
             R Sedlak                                                      
             <rsedlak2000@yaho                                             
             o.com>                                                     To 
                                       TechNet E-Mail Forum                
             09/18/2009 02:54          <[log in to unmask]>, Karen Tellefsen  
             PM                        <[log in to unmask]> 
                                                                        cc 
                                                                           
                                                                   Subject 
                                       Re: [TN] Hydrobromic Acid           
                                       containing flux                     
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




                                                                                                                                                      
 Karen:   Obviously, cannot comment on your fluxes.   Frankly, though, I cannot understand why you would use relatively expensive HBr, when           
 Hydrochloric would work as well, or better, absent Hydrazine.                                                                                        
                                                                                                                                                      
 We have not found any reason to use HBr, save to solublize (sp?) Hydrazine.   Thus my comment.                                                       
                                                                                                                                                      
 Rudy Sedlak                                                                                                                                          
 RD Chemical Company                                                                                                                                  
                                                                                                                                                      
 --- On Fri, 9/18/09, Karen Tellefsen <[log in to unmask]> wrote:                                                                      
                                                                                                                                                      
  From: Karen Tellefsen <[log in to unmask]>                                                                                           
  Subject: Re: [TN] Hydrobromic Acid containing flux                                                                                                  
  To: [log in to unmask]                                                                                                                                 
  Date: Friday, September 18, 2009, 11:08 AM                                                                                                          
                                                                                                                                                      
  Are you referring to assembly fluxes?  If so, a lot of fluxes contain HBr,                                                                          
  but very few of them contain hydrazine, at least regarding the ones we                                                                              
  make.  They are far more likely to contain amines, which are a lot safer.                                                                           
  Additionally, amines are a lot cheaper than hydrazine.                                                                                              
                                                                                                                                                      
  BTW, I've inhaled hydrazine in the past, not during the 15 years I've been                                                                          
  at Cookson.                                                                                                                                         
                                                                                                                                                      
  Karen Tellefsen - Electrical Testing                                                                                                                
  [log in to unmask]                                                                                                                   
                                                                                                                                                      
                                                                                                                                                      
                                                                                                                                                      
                                                                                                                                                      
                                                                                                                                                      
               R Sedlak                                                                                                                               
               <rsedlak2000@YAHO                                                                                                                      
               O.COM>                                                     To                                                                          
               Sent by: TechNet          [log in to unmask]                                                                                              
               <[log in to unmask]>                                          cc                                                                          
                                                                                                                                                      
                                                                     Subject                                                                          
               09/18/2009 01:52          [TN] Hydrobromic Acid containing                                                                             
               PM                        flux                                                                                                         
                                                                                                                                                      
                                                                                                                                                      
               Please respond to                                                                                                                      
                TechNet E-Mail                                                                                                                        
                     Forum                                                                                                                            
               <[log in to unmask]>                                                                                                                      
               ; Please respond                                                                                                                       
                      to                                                                                                                              
                   R Sedlak                                                                                                                           
               <rsedlak2000@YAHO                                                                                                                      
                    O.COM>                                                                                                                            
                                                                                                                                                      
                                                                                                                                                      
                                                                                                                                                      
                                                                                                                                                      
                                                                                                                                                      
                                                                                                                                                      
  Re:   Hydrobromic Acid                                                                                                                              
                                                                                                                                                      
  Most fluxes which list Hydrobromic acid as an ingredient also contain                                                                               
  Hydrazine.   The reason why Hydrobromic is used is that it is one of the                                                                            
  few acids which forms soluble salts with Hydrazine.    When the Hydrobromic                                                                         
  and Hydrazine are mixed, a compound called Hydrazine Hydrobromide is                                                                                
  formed, and this compound is not a known carcinogen, so if it is present at                                                                         
  levels less than 1%, it does not need to be listed on the MSDS.                                                                                     
                                                                                                                                                      
  I mention this because at temperature, the Hydrazine Hydrobromide breaks                                                                            
  down, and volatilizes, and is not something I would recommend inhaling too                                                                          
  much of.   Although, you can emulate a former US president, who "did not                                                                            
  inhale"!                                                                                                                                            
                                                                                                                                                      
  Rudy Sedlak                                                                                                                                         
  RD Chemical Company                                                                                                                                 
                                                                                                                                                      
  --- On Fri, 9/18/09, Paul Edwards <[log in to unmask]> wrote:                                                                                     
                                                                                                                                                      
  From: Paul Edwards <[log in to unmask]>                                                                                                           
  Subject: Re: [TN] Black Pad                                                                                                                         
  To: [log in to unmask]                                                                                                                                 
  Date: Friday, September 18, 2009, 9:38 AM                                                                                                           
                                                                                                                                                      
  This effect can also appear if the PCBs have been baked...                                                                                          
                                                                                                                                                      
  Then good luck soldering to the PCBs with anything other than hydrobromic                                                                           
  acid...                                                                                                                                             
                                                                                                                                                      
  Paul                                                                                                                                                
                                                                                                                                                      
  Paul Edwards                                                                                                                                        
                                                                                                                                                      
  Surface Art Engineering                                                                                                                             
                                                                                                                                                      
                                                                                                                                                      
  -----Original Message-----                                                                                                                          
  From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman                                                                                
  Sent: Friday, September 18, 2009 6:54 AM                                                                                                            
  To: [log in to unmask]                                                                                                                                 
  Subject: Re: [TN] Black Pad                                                                                                                         
                                                                                                                                                      
  Hi Rudy - actually, if the copper and tin form an intermetallic phase                                                                               
  during your first pass thru the reflow oven (which they should) then you                                                                            
  would have solderability issues during subsequent soldering operations.                                                                             
                                                                                                                                                      
  Dave Hillman                                                                                                                                        
  Rockwell Collins                                                                                                                                    
  [log in to unmask]                                                                                                                        
                                                                                                                                                      
                                                                                                                                                      
                                                                                                                                                      
                                                                                                                                                      
  R Sedlak <[log in to unmask]>                                                                                                                    
  Sent by: TechNet <[log in to unmask]>                                                                                                                  
  09/18/2009 08:44 AM                                                                                                                                 
  Please respond to                                                                                                                                   
  TechNet E-Mail Forum <[log in to unmask]>; Please respond to                                                                                           
  R Sedlak <[log in to unmask]>                                                                                                                    
                                                                                                                                                      
                                                                                                                                                      
  To                                                                                                                                                  
  [log in to unmask]                                                                                                                                     
  cc                                                                                                                                                  
                                                                                                                                                      
  Subject                                                                                                                                             
  Re: [TN] Black Pad                                                                                                                                  
                                                                                                                                                      
                                                                                                                                                      
                                                                                                                                                      
                                                                                                                                                      
                                                                                                                                                      
                                                                                                                                                      
  Linda:                                                                                                                                              
  Actually, it is quite possible to get black immersion Tin.   It comes from                                                                          
  running a bath with an excess of Cupric Copper in it.   I wrote a article                                                                           
  on how to monitor Cupric Copper in immersion Tin baths to avoid this in a                                                                           
  recent PCD&F magazine.                                                                                                                              
                                                                                                                                                      
  The black color should not affect solderability, as it is actually                                                                                  
  immersion Copper on top of the Tin.                                                                                                                 
  Rudy Sedlak                                                                                                                                         
  RD Chemical Company                                                                                                                                 
                                                                                                                                                      
  --- On Fri, 9/18/09, Linda Langley <[log in to unmask]> wrote:                                                                                 
                                                                                                                                                      
  From: Linda Langley <[log in to unmask]>                                                                                                       
  Subject: [TN] Black Pad                                                                                                                             
  To: [log in to unmask]                                                                                                                                 
  Date: Friday, September 18, 2009, 3:12 AM                                                                                                           
                                                                                                                                                      
  I know we have had this subject many times before so I did go to the                                                                                
  archives and still can't find an answer. My question, is Black Pad only                                                                             
  associated with ENIG? Is it possible with immersion Tin?                                                                                            
                                                                                                                                                      
                                                                                                                                                      
                                                                                                                                                      
  Linda Langley CIT                                                                                                                                   
                                                                                                                                                      
  Training Specialist                                                                                                                                 
                                                                                                                                                      
  Jabil Circuit                                                                                                                                       
                                                                                                                                                      
  248-292-6176                                                                                                                                        
                                                                                                                                                      
                                                                                                                                                      
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