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 >> >> ################################################################ >> TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c >> ################################################################ >> To subscribe/unsubscribe, send a message to [log in to unmask] with >> following text in the body: >> To subscribe: SUBSCRIBE TechNet <your full name> >> To unsubscribe: SIGNOFF TechNet >> ################################################################ >> Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional >> information. >> For the technical support contact Dmitriy Sklyar at [log in to unmask] or >> 847-509-9700 ext.311 >> ################################################################ >> > >################################################################ >TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c >################################################################ >To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: >To subscribe: SUBSCRIBE TechNet <your full name> >To unsubscribe: SIGNOFF TechNet >################################################################ >Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. >For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 >################################################################ > > SURFACE MOUNT TECHNOLOGY ASSOCIATION Enabling members to achieve success in surface mount and companion technologies through education, training and access to knowledge. 5200 Willson Road, Suite 215, Edina, MN 55424-1343 612-920-7682 F 612-926-1819 [log in to unmask] www.smta.org ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. 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