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From: Bill Hannahan <wfhannahan@yahoo.com>
Subject: nose wheel shimmy
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  Mike Easley wrote;
  I also ran some viscosity tests on … None of them performed very well.  … All of the oils lost about half of their viscosity (measured in time) in only 30 degrees F…
   
   
  Mike, I serviced my 360 strut with Mobil 1  75W-90  gear oil several months ago. The dampening is very high, which I like. I find it easier to taxi in a straight line and easier to back it into the hanger without a tow bar. I had no problems this winter before or after flights in temps down to 20F. It has a pour point of -51F.
          Mobil 1 Synthetic Gear Lubricant LS
    
      SAE Grade
    75W-90
      Viscosity, ASTM D 445 
     
      cSt @ 40ºC 
    106 
      cst @ 100ºC 
    15.2 
      Viscosity Index, ASTM D 2270 
    150 
      Pour Point, ºC, ASTM D 97 
    -46 
      Flash Point, ºC, ASTM D 92 
    175 
      Density@15C kg/l, ASTM D 4052 
    0.859
   
   
  Mobil 1 15-50 has a lower viscosity.
          Mobil 1 15W-50 
    
      SAE Grade
    15W-50
      Viscosity, ASTM D 445 
     
      cSt @ 40º C 
    131.2
      cSt @ 100º C 
    18.1
      Viscosity Index, ASTM D 2270 
    154
      Sulfated Ash, wt%, ASTM D 874 
    1.21
      HTHS Viscosity, mPa•s @ 150ºC ASTM D 4683
    4.50
      Pour Point, ºC, ASTM D 97 
    -39
      Flash Point, ºC, ASTM D 92 
    235
      Density @15º C kg/l, ASTM D 4052 
    0.87
   
   
  My theory is that builders could ratio these two fluids to provide the dampening level they desire.
  The synthetics have viscosity index improvers claimed to provide a flatter vis/temp curve.
   
  Mike,
  Would you mind testing these two materials and reporting back?
   
  I notice that the flash point of the 75-90, 347F, is less than that of the 15-50. Does anybody know what the critical temperature would be with air at the pressures we run? 
  I recommend nitrogen, although I used air due to availability.


BILL HANNAHAN 
WFHANNAHAN@YAHOO.COM

       
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<DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p><FONT face=arial>&nbsp;</FONT></o:p></DIV>  <DIV class=MsoBodyText style="MARGIN: 0in 0in 6pt"><FONT face=arial>Mike Easley wrote;<o:p></o:p></FONT></DIV>  <DIV class=MsoBodyText style="MARGIN: 0in 0in 6pt"><FONT face=arial>I also ran some viscosity tests on … None of them performed very well.&nbsp; … All of the oils lost about half of their viscosity (measured in time) in only 30 degrees F…</FONT></DIV>  <DIV class=MsoBodyText style="MARGIN: 0in 0in 6pt"><FONT face=arial></FONT>&nbsp;</DIV>  <DIV class=MsoBodyText style="MARGIN: 0in 0in 6pt"><FONT face=arial><o:p></o:p></FONT>&nbsp;</DIV>  <DIV class=MsoBodyText style="MARGIN: 0in 0in 6pt"><FONT face=arial>Mike, I serviced my 360 strut with Mobil 1<SPAN style="mso-spacerun: yes">&nbsp; </SPAN>75W-90<SPAN style="mso-spacerun: yes">&nbsp; </SPAN>gear oil several months ago. The dampening is very
 high, which I like. I find it easier to taxi in a straight line and easier to back it into the hanger without a tow bar. I had no problems this winter before or after flights in temps down to 20F. It has a pour point of -51F.<o:p></o:p></FONT></DIV>  <TABLE class=MsoNormalTable style="BACKGROUND: #cccccc; WIDTH: 123pt; mso-cellspacing: .6pt; mso-padding-alt: 2.4pt 2.4pt 2.4pt 2.4pt" cellSpacing=1 cellPadding=0 width=205 border=0>  <TBODY>  <TR style="mso-yfti-irow: 0">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #cfe8ff; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; WIDTH: 81pt; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top width=135>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>Mobil 1 Synthetic Gear Lubricant LS<o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #e8f4ff; PADDING-BOTTOM:
 2.4pt; BORDER-LEFT: #d4d0c8; WIDTH: 42pt; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top width=70>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" /><v:shapetype id=_x0000_t75 stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"><v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:connecttype="rect" gradientshapeok="t" o:extrusionok="f"></v:path><o:lock aspectratio="t"
 v:ext="edit"></o:lock></v:shapetype><v:shape id=_x0000_i1025 style="WIDTH: 46.8pt; HEIGHT: 0.6pt" type="#_x0000_t75" alt=""><v:imagedata o:href="http://www.mobil.com/Images/spacer.gif" src="file:///C:\WINDOWS\TEMP\msohtml1\01\clip_image001.gif"><FONT face=arial></FONT></v:imagedata></v:shape><o:p></o:p></DIV></TD></TR>  <TR style="mso-yfti-irow: 1">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>SAE Grade<o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT
 face=arial>75W-90<o:p></o:p></FONT></DIV></TD></TR>  <TR style="mso-yfti-irow: 2">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>Viscosity, ASTM D 445 <o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>&nbsp;<o:p></o:p></FONT></DIV></TD></TR>  <TR style="mso-yfti-irow: 3">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM:
 #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>cSt @ 40ºC <o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>106 <o:p></o:p></FONT></DIV></TD></TR>  <TR style="mso-yfti-irow: 4">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>cst @ 100ºC <o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8;
 PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>15.2 <o:p></o:p></FONT></DIV></TD></TR>  <TR style="mso-yfti-irow: 5">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>Viscosity Index, ASTM D 2270 <o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>150 <o:p></o:p></FONT></DIV></TD></TR>  <TR style="mso-yfti-irow: 6">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8;
 PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>Pour Point, ºC, ASTM D 97 <o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>-46 <o:p></o:p></FONT></DIV></TD></TR>  <TR style="mso-yfti-irow: 7">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>Flash Point, ºC, ASTM D 92 <o:p></o:p></FONT></DIV></TD>  <TD
 style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>175 <o:p></o:p></FONT></DIV></TD></TR>  <TR style="mso-yfti-irow: 8; mso-yfti-lastrow: yes">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>Density@15C kg/l, ASTM D 4052 <o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in
 0pt"><FONT face=arial>0.859<o:p></o:p></FONT></DIV></TD></TR></TBODY></TABLE>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><o:p><FONT face=arial>&nbsp;</FONT></o:p></DIV>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><o:p><FONT face=arial>&nbsp;</FONT></o:p></DIV>  <DIV class=MsoBodyText style="MARGIN: 0in 0in 6pt"><FONT face=arial>Mobil 1 15-50 has a lower viscosity.<o:p></o:p></FONT></DIV>  <TABLE class=MsoNormalTable style="BACKGROUND: #cccccc; WIDTH: 123pt; mso-cellspacing: .6pt; mso-padding-alt: 2.4pt 2.4pt 2.4pt 2.4pt" cellSpacing=1 cellPadding=0 width=205 border=0>  <TBODY>  <TR style="mso-yfti-irow: 0">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #cfe8ff; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; WIDTH: 81pt; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top width=135>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>Mobil 1 15W-50 <o:p></o:p></FONT></DIV></TD> 
 <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #e8f4ff; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; WIDTH: 42pt; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top width=70>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><v:shape id=_x0000_i1026 style="WIDTH: 46.8pt; HEIGHT: 0.6pt" type="#_x0000_t75" alt=""><v:imagedata o:href="http://www.mobil.com/Images/spacer.gif" src="file:///C:\WINDOWS\TEMP\msohtml1\01\clip_image001.gif"><FONT face=arial></FONT></v:imagedata></v:shape><o:p></o:p></DIV></TD></TR>  <TR style="mso-yfti-irow: 1">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>SAE Grade<o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT:
 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>15W-50<o:p></o:p></FONT></DIV></TD></TR>  <TR style="mso-yfti-irow: 2">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>Viscosity, ASTM D 445 <o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>&nbsp;<o:p></o:p></FONT></DIV></TD></TR>  <TR
 style="mso-yfti-irow: 3">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>cSt @ 40º C <o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>131.2<o:p></o:p></FONT></DIV></TD></TR>  <TR style="mso-yfti-irow: 4">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in
 0pt"><FONT face=arial>cSt @ 100º C <o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>18.1<o:p></o:p></FONT></DIV></TD></TR>  <TR style="mso-yfti-irow: 5">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>Viscosity Index, ASTM D 2270 <o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top> 
 <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>154<o:p></o:p></FONT></DIV></TD></TR>  <TR style="mso-yfti-irow: 6">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>Sulfated Ash, wt%, ASTM D 874 <o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>1.21<o:p></o:p></FONT></DIV></TD></TR>  <TR style="mso-yfti-irow: 7">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt;
 BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>HTHS Viscosity, mPa•s @ 150ºC ASTM D 4683<o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>4.50<o:p></o:p></FONT></DIV></TD></TR>  <TR style="mso-yfti-irow: 8">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>Pour Point, ºC, ASTM D 97 <o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP:
 #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>-39<o:p></o:p></FONT></DIV></TD></TR>  <TR style="mso-yfti-irow: 9">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>Flash Point, ºC, ASTM D 92 <o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>235<o:p></o:p></FONT></DIV></TD></TR>  <TR style="mso-yfti-irow: 10;
 mso-yfti-lastrow: yes">  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: #f2f2f2; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>Density @15º C kg/l, ASTM D 4052 <o:p></o:p></FONT></DIV></TD>  <TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 2.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 2.4pt; BACKGROUND: white; PADDING-BOTTOM: 2.4pt; BORDER-LEFT: #d4d0c8; PADDING-TOP: 2.4pt; BORDER-BOTTOM: #d4d0c8" vAlign=top>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=arial>0.87<o:p></o:p></FONT></DIV></TD></TR></TBODY></TABLE>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><o:p><FONT face=arial>&nbsp;</FONT></o:p></DIV>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt"><o:p><FONT face=arial>&nbsp;</FONT></o:p></DIV>  <DIV class=MsoBodyText style="MARGIN: 0in 0in 6pt"><FONT face=arial>My
 theory is that builders could ratio these two fluids to provide the dampening level they desire.<o:p></o:p></FONT></DIV>  <DIV class=MsoBodyText style="MARGIN: 0in 0in 6pt"><FONT face=arial>The synthetics have viscosity index improvers claimed to provide a flatter vis/temp curve.</FONT></DIV>  <DIV class=MsoBodyText style="MARGIN: 0in 0in 6pt"><o:p><FONT face=arial>&nbsp;</FONT></o:p></DIV>  <DIV class=MsoBodyText style="MARGIN: 0in 0in 6pt"><FONT face=arial>Mike,</FONT></DIV>  <DIV class=MsoBodyText style="MARGIN: 0in 0in 6pt"><FONT face=arial>Would you mind testing these two materials and reporting back?</FONT></DIV>  <DIV class=MsoBodyText style="MARGIN: 0in 0in 6pt"><FONT face=arial><o:p></o:p></FONT>&nbsp;</DIV>  <DIV class=MsoBodyText style="MARGIN: 0in 0in 6pt"><FONT face=arial>I notice that the flash point of the 75-90, 347F, is less than that of the 15-50. Does anybody know what the critical temperature would be with air at the pressures we run? </FONT></DIV> 
 <DIV class=MsoBodyText style="MARGIN: 0in 0in 6pt"><FONT face=arial>I recommend nitrogen, although I used air due to availability.<o:p></o:p></FONT></DIV><BR><BR><DIV id=RTEContent>BILL HANNAHAN <BR>WFHANNAHAN@YAHOO.COM</DIV><p>&#32;
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