Karen: I know only a little about assembly fluxes. I know much more about HAL fluxes. General rule we have found is that in HAL fluxes, if the MSDS lists Hydrobromic acid, the flux will also contain Hydrazine. 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, 1:15 PM 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? 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