<div>Process for producing graphite tubes:</div><div><br></div><div>Quote</div><div>Synthetic graphite is manufactured from crude oil cokes and pitch. The pasty mixture is shaped into </div><div>monolithic blocks or tubes. Tubes are extruded whereas blocks are usually vibration molded. The </div>
<div>shape is then carbonized at 900ºC (1650 F)for a few hours and then fully graphitised at 2900ºC (5250 </div><div>F) for several days. The block or tubes are then impregnated with synthetic resin that is then </div><div>
polymerized to render them totally impervious to gases and fluids. </div><div>The resulting material is fully corrosion resistant to most common acids (sulfuric acid, hydrochloric </div><div>acid and of course industrial phosphoric acid) and has a very high thermal conductivity of around 80 </div>
<div>W/m.K for tubes or 140 W/m.K for blocks when totally graphitised. The tube wall is quite thick, 6 </div><div>mm (1/4”) and the individual tubes are 3 meters (10’) long.</div>Unquote<div><br></div><div>ksv<br><div class="gmail_quote">
On Mon, Jul 16, 2012 at 9:27 AM, Bob Stuart <span dir="ltr"><<a href="mailto:bobstuart@sasktel.net" target="_blank">bobstuart@sasktel.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word">
In the early days of graphite fiber/graphite matrix brake disks on race cars, the ceramic coating would sometimes crack, allowing oxygen onto the hot graphite. The result became known in the pits as "Designer Coal."<span class="HOEnZb"><font color="#888888"><div>
<br></div><div>Bob</div></font></span><div><div class="h5"><div><br></div><div><div><div>On 15-Jul-12, at 9:50 PM, Viswanathan KS wrote:</div><br><blockquote type="cite">IMO the graphite tubes are not coated.<br><br><div class="gmail_quote">
On Mon, Jul 16, 2012 at 8:45 AM, Bob Stuart <span dir="ltr"><<a href="mailto:bobstuart@sasktel.net" target="_blank">bobstuart@sasktel.net</a>></span> wrote:<br> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Would the coating that protects the graphite from oxidation not also work on copper?<span><font color="#888888"><br> <br> Bob</font></span><div><br> <br> On 15-Jul-12, at 8:10 PM, Tom Miles wrote:<br> <br> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div> Graphite heat exchangers are now used on domestic condensing hot water boilers. (See SGL Group.) Heat transfer is reportedly 8 times that of stainless steel. Why not use them for cooling and condensing producer gas?<br>
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