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May 1998

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Subject:
From:
David Gonnerman <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 19 May 1998 15:22:53 -0500
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text/plain (121 lines)
Bev is right about fluoride burns - a few weeks ago a man spent an entire
"ER" episode dying from them.

-David


At 08:36 AM 5/15/98 -0400, you wrote:
>Jean, Rudy,
>If you are going to use ammonium bifluoride (ammonium hydrogen fluoride for
>the non-chemically inclined), BE CAREFUL.  All ionic fluorides should be
>treated with care.  Certainly this one is not as bad as hydrofluoric acid,
>fluorosulfuric acid or super oxidizers like arsenic pentafluoride, but do be
>careful.  I could go on about other very interesting nasties, but I'll
>control myself and stop here. Fluoride burns are nasty.  They don't always
>hurt at first, but they sure will later!  Fluoride will continue to
>penetrate the skin and will eventually start to leach calcium from the bones
>and can lead to localized "chemical osteoporosis" (my term, I'm not a med).
>
>It would be a good idea to have at hand as a first aid treatment a saturated
>solution of tetramethylammonium chloride or some other quarternary ammonium
>salt.  If one comes in contact with a solution capable of liberating
>fluoride, dip the affected portion in an ice cold saturated solution of this
>stuff (good chemical term).  The tetramethyl ammonium ion will sequester the
>fluoride ions enough to let the body deal with them.  The cold decreases the
>diffusion rate of the fluoride into the depths of the body.  Certainly the
>ice will dilute the stored room temperature saturated solution, but that's
>OK.  Obviously remove the affected portion form the cold solution once in a
>while to avoid excessive cooling and its attendant problems.
>
>I'm not making this up.  Check it out in the CRC Handbook of Laboratory
>Safety, 2nd Edition, CRC Press Inc., Boca Raton, 1976, pp45-47 (obviously
>different pages in newer editions!  :)   )  This is based on some excellent
>work by a med in DuPont, who know full well about fluoride burns from past
>experiences, unfortunately.
>
>regards,
>Bev Christian
>Nortel
>> ----------
>> From:         RSedlak[SMTP:[log in to unmask]]
>> Sent:         Thursday, May 14, 1998 10:45 PM
>> To:   [log in to unmask]
>> Subject:      Re: [TN] Help
>>
>> Jean:
>>
>> This is one of those experiences that may be exactly what you need, or may
>> also result in gales of laughter.
>>
>> I had a similar need, to glue my rear view mirror to my windshield, in a
>> non-
>> standard position.   I solved the problem by using standard Dow RTV
>> silicone,
>> BUT, in order to get it to adhere, I had to roughen the surface of the
>> glass,
>> using emery paper.
>>
>> Now, using emery paper on your parts may be difficult, or impractical, and
>> so
>> my suggestion is use a mild glass etch, which could be a simple 10%
>> solution
>> of ammonium biflouride, which you could put on with a cotton swab.   Rinse
>> well, then dry, and apply your silicone.
>>
>> Hope it works for you.
>>
>> Rudy Sedlak
>> RD Chemical Company
>>
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