[Milsurplus] [ARC5] MFP - how to remove?

[antqradio at sbcglobal.net]

More information on MPF:http://www.redwaveradio.com/4_e02ebf553f9f1c97_1.htm
Best advice is to wash your hands after working on MFP coatings!Jim


      From: don davis <dxguy at earthlink.net>
 To: 'Ken Gordon' <kgordon2006 at frontier.com>; Milsurplus at mailman.qth.net 
Cc: Arc5 at mailman.qth.net
 Sent: Sunday, September 25, 2016 10:40 AM
 Subject: Re: [Milsurplus] [ARC5] MFP - how to remove?
   
<!--#yiv5478522803 _filtered #yiv5478522803 {font-family:"Cambria Math";panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv5478522803 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv5478522803 #yiv5478522803 p.yiv5478522803MsoNormal, #yiv5478522803 li.yiv5478522803MsoNormal, #yiv5478522803 div.yiv5478522803MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:12.0pt;font-family:"Times New Roman", serif;}#yiv5478522803 a:link, #yiv5478522803 span.yiv5478522803MsoHyperlink {color:#0563C1;text-decoration:underline;}#yiv5478522803 a:visited, #yiv5478522803 span.yiv5478522803MsoHyperlinkFollowed {color:#954F72;text-decoration:underline;}#yiv5478522803 span.yiv5478522803EmailStyle17 {font-family:"Calibri", sans-serif;color:#1F497D;}#yiv5478522803 .yiv5478522803MsoChpDefault {font-size:10.0pt;} _filtered #yiv5478522803 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv5478522803 div.yiv5478522803WordSection1 {}-->I would be reluctant to take any sort of grinding tool to any unknown metal surfaces from that era and earlier.  There are lots of real nasty things:  cadmium, chromate, zinc, lead, beryllium, BeO, radium, spent uranium, mercury and others that show up in strange places.  If you heat these or put powder in the air you could be in trouble health-wise.  Also, folks in those days didn’t really know or care about safety and identification of hazards.  Things like paper, and other organics were sometimes treated with mercury compounds to inhibit fungus, and DDT wound up in paint and coatings and over-spray from normal use.  PCBs which form dioxins at high heat were used in high voltage / power switch gear (but I saw a lot of these in USAF radar and B52 electronics as well).  We used carbon-tet and leaded gas for cleaning solvent.  Sometimes while smoking a Marlboro.     I don’t know what’s in MFP; I’ve performed a literature search and have very few credible sources.  Some believe mercury was used, DDT, lacquer, paint, shellac, etc.  Consensus is scrape off the area you’re are going to rework, use only enough heat to get it done, and area well ventilated, and avoid disruption of intact metal surfaces.  I’m NOT a chemist, so I won’t argue against any better knowledge from others, but I was in aerospace engineering 35 years,  and 9 years in Air Force on B52 electronics and flight simulators  where I spent a lot of time working around this stuff and designing a lot of it out of modern equipment.  The “hot advice” in those early days was “if in doubt, dig a hole and bury it…”  73 de don ad6pb
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