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July 2004

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Subject:
Re: "lead vapors" myth
From:
Richard Schumacher <[log in to unmask]>
Reply To:
(Leadfree Electronics Assembly Forum)
Date:
Tue, 13 Jul 2004 12:22:04 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (47 lines) 
Look up "vapor pressure".  The vapor pressure is not zero even far below the
boiling point.


> -----Original Message-----
> From: Leadfree [mailto:[log in to unmask]] On Behalf Of Harvey Miller
> Sent: Tuesday, July 13, 2004 12:12 PM
> To: [log in to unmask]
> Subject: [LF] "lead vapors" myth
>
>
> Recently Pascal from Alcatel, Ted Smith of Silicon Valley
> Toxics Coalition, among others, have refer to lead vapor
> exposure to Chinese recyclers dismantling populated PC
> boards. Most participants know that this is a fiction; the
> "vapors" are flux, not healthy, but not lead.  But I thought
> I'd check the actual parameters
>
> Handbook of Chemistry and Physics says that lead boiling
> temperature is 1780 degrees C. Trade sources say that
> soldering irons attain 300 degrees C.
>
> The lead vapor myth should be nailed.
>
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