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| Vapour phase Soldering |
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| wraper:
I have LS230 sitting in the oven covered with just a lid (not airtight), reflowing small batches of boards once in a while. During about 6 months didn't notice any serious amount leaking away. I actually cleaned the oven, so removed the fluid back in the bottle. Didn't seem that more than 5% was lost |
| mrpackethead:
--- Quote from: coppice on October 11, 2016, 09:07:11 pm --- --- Quote from: helius on October 11, 2016, 02:50:32 pm ---Remember that you are talking about a liquid with a boiling point of 200°C! Unless you operate your line in Death Valley in the summer, precious little escaping vapor will make it into the atmosphere. --- End quote --- The vapour pressure of galden is around zero in most rooms, so you might be surprised how quickly it evaporates in those rooms, even given its high boiling point. --- End quote --- Pratical experience is showing that this largely is not the case. I've not lost any noticabel fluid out of my tank.. ( its got a stainless steel lid on it but not particaully well sealed ) |
| Chris Jones:
I edited my post above as I noticed that I was wrong about all of the LS215 bottles being empty. I still think that if one is concerned about global warming as well as cost then it is worthwhile using bottles that are gas-tight (so they hold some slight pressure without leaking), and that it would be worth following Solvay's recommendation on seal materials. Also to minimise evaporation of Galden at room temperature, it might be better to choose the higher temperature LS230 grade rather than LS215, regardless of solder type. My impression is still that it is worthwhile to make sure the chamber lid seals well, like on the Asscon Quicky, because I found that there are drops of Galden condensation all over the inside of the glass lid, even though the machine hasn't been used in the last a few months. I found that the boards are not totally dry when removed from the chamber, and so I think that after soldering, it might be nice to keep the board warm (maybe 100 degrees C ?, e.g. with IR lamps shining through the glass lid) after the board has been raised but whilst it is still in the cold chamber (preferably with the chamber chilled), to recover the last traces of Galden before the board is removed. |
| KaneTW:
IconicPCB, did that project go anywhere? I've been interested in building a vapor phase machine but I don't know how much work you've already done. I imagine the most headache would be the vapor cooling since that has to deal with either superheated steam or steam venting. |
| SWR:
--- Quote from: mrpackethead on January 22, 2015, 09:58:11 am ---Tombstones are just painful. We get the odd ones happening in our reflow oven from time to time. --- End quote --- I know this is an old thread, but just out of curiosity: did you try the notched paste mask (see picture)? |
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