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This is a multi-part message in MIME format. ------=_NextPart_000_0033_01BDF2D6.58D35550 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Steve Lindbloom wrote: .....We seem to be coming to the same point now with the O2 lubes. Up to now everyone has just been using any O2 safe lube they can lay their hands on figuring it was a lot better than nothing. But, as the gear manufacturers get involved, we are seeing some research done to find the optimumproducts. Just about all of them - including Sherwood, Seaquest, USD and SP - have specified Christolube. So that would seem to make Christolube the saferbet. While we're on lube, can anyone tell me what the right grade of Krytox is for use in regs? It comes in several grades, and I notice the stuff Randy is selling is the vacuum grade. While it is really expensive stuff, and Randy's price is a bargain if you need that grade and that much, there is an general purpose grade that sells for half as much - only $16 for a 2oztube. ---------------------------------------------------------------------------- ------------------------------------- The scuba manufacturers are going with Christolube because Gary Goodin (spelling?) has been marketing the product to them very aggressively since 1991. I have usually sold his competitor's product, Aerospace Lubricants Tribolube 16. This is chemically identical to Christolube. Krytox is a different chemical makeup but is still a good lubricant and is O2 compatible. I believe that this cache that I stumbled upon is designated GPL (general purpose lube) and I believe that is is the same as the general purpose grade that Steve mentions as selling for $16 for a 2 oz tube. I don't know what DuPont calls the vacuum grade of Krytox. You can probably buy the Krytox GPL from various industrial suppliers at that price (I did so several years ago when there was no military surplus grease available and customers were screaming for it -- that was one of many times that I sold product for the same price that I paid for it). $16 for 2 ounces is still $8 an ounce, and $35 for an 8oz tube equates to $4.38 an ounce. The bottom line on these greases, is that they all suck. I've used Halocarbon 25, Krytox 240AZ, Krytox GPL, Christolube MPG (or whatever), Tribolube 16, Tribolube 10, etc. The oil separates from the thickener, leaving nothing but thickener behind. In a static o-ring seal application (like tank to valve), this appears over time as a white chalky substance on the o-ring and sealing surfaces. I did not do a scientific study, but my impression is that the Tribolube and Christolube products were the best, the Krytox not quite as good (but more than adequate), and the Halocarbon 25 barely adequate. Finally, I apologize for making so many blatant commercial posts, but I can't promise to stop right away. As many of you know, I am in the process of closing Underwater Applications (I have a "real" job now). I still have close to $40,000 (my cost) worth of inventory remaining and I have to get rid of it. If someone offered me anything close to that amount for everything, I would deliver it, along with assembly and machinist drawings, my accounting software (with all customers and vendors), the whole company without a second thought. Unfortunately, it looks like the inventory is going to slowly trickle out (at the current rate it will take 2 years or more) or become absorbed into my personal supply of equipment (what am I going to do with that 8 foot long piece of 2" diameter solid stainless steel???). Sincerely, C. Randy Bohrer, President Underwater Applications Corp 15 Brewster Rd Framingham, MA 01702 tel: 508-628-9520 fax: 508-820-3337 http://www.geocities.com/~uwapplications ------=_NextPart_000_0033_01BDF2D6.58D35550 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN"> <HTML> <HEAD> <META content=3D"text/html; charset=3Diso-8859-1" = http-equiv=3DContent-Type> <META content=3D'"MSHTML 4.72.3110.7"' name=3DGENERATOR> </HEAD> <BODY bgColor=3D#ffffff> <DIV><SPAN class=3D909474819-08101998><FONT color=3D#000000 face=3DArial = size=3D2>Steve=20 Lindbloom wrote:</FONT></SPAN></DIV> <DIV><SPAN class=3D909474819-08101998><FONT color=3D#000000 face=3DArial = size=3D2></FONT></SPAN><FONT size=3D2><SPAN = class=3D909474819-08101998><FONT=20 color=3D#000000 face=3DArial size=3D2>....</FONT></SPAN>We seem to be = coming to the=20 same point now with the O2 lubes. Up to now<BR>everyone has just been = using any=20 O2 safe lube they can lay their hands on<BR>figuring it was a lot better = than=20 nothing. But, as the gear manufacturers<BR>get involved, we are seeing = some=20 research done to find the optimumproducts.<BR>Just about all of them - = including=20 Sherwood, Seaquest, USD and SP - have<BR>specified Christolube. So that = would=20 seem to make Christolube the saferbet.<BR>While we're on lube, can = anyone tell=20 me what the right grade of Krytox is<BR>for use in regs? It comes in = several=20 grades, and I notice the stuff Randy<BR>is selling is the vacuum grade. = While it=20 is really expensive stuff, and<BR>Randy's price is a bargain if you need = that=20 grade and that much, there is<BR>an general purpose grade that sells for = half as=20 much - only $16 for a 2oztube.</FONT></DIV> <DIV><FONT color=3D#000000 face=3DArial size=3D2><SPAN=20 class=3D909474819-08101998>----------------------------------------------= -------------------------------------------------------------------</SPAN= ></FONT></DIV> <DIV><FONT color=3D#000000 face=3DArial size=3D2><SPAN=20 class=3D909474819-08101998></SPAN></FONT> </DIV> <DIV><SPAN class=3D909474819-08101998><FONT color=3D#000000 face=3DArial = size=3D2>The=20 scuba manufacturers are going with Christolube because Gary Goodin = (spelling?)=20 has been marketing the product to them very aggressively since 1991. I = have=20 usually sold his competitor's product, Aerospace Lubricants Tribolube = 16. This=20 is chemically identical to Christolube. Krytox is a different chemical = makeup=20 but is still a good lubricant and is O2 compatible. I believe that this = cache=20 that I stumbled upon is designated GPL (general purpose lube) and I = believe that=20 is is the same as the general purpose grade that Steve mentions as = selling for=20 $16 for a 2 oz tube. I don't know what DuPont calls the vacuum grade of = Krytox.=20 You can probably buy the Krytox GPL from various industrial suppliers at = that=20 price (I did so several years ago when there was no military surplus = grease=20 available and customers were screaming for it -- that was one of many = times that=20 I sold product for the same price that I paid for it). $16 for 2 ounces = is still=20 $8 an ounce, and $35 for an 8oz tube equates to $4.38 an=20 ounce.</FONT></SPAN></DIV> <DIV><SPAN class=3D909474819-08101998><FONT color=3D#000000 face=3DArial = size=3D2></FONT></SPAN> </DIV> <DIV><SPAN class=3D909474819-08101998><FONT color=3D#000000 face=3DArial = size=3D2>The=20 bottom line on these greases, is that they all suck. I've used = Halocarbon 25,=20 Krytox 240AZ, Krytox GPL, Christolube MPG (or whatever), Tribolube 16, = Tribolube=20 10, etc. The oil separates from the thickener, leaving nothing but = thickener=20 behind. In a static o-ring seal application (like tank to valve), this = appears=20 over time as a white chalky substance on the o-ring and sealing = surfaces. I did=20 not do a scientific study, but my impression is that the Tribolube and=20 Christolube products were the best, the Krytox not quite as good (but = more than=20 adequate), and the Halocarbon 25 barely adequate.</FONT></SPAN></DIV> <DIV><SPAN class=3D909474819-08101998><FONT color=3D#000000 face=3DArial = size=3D2></FONT></SPAN> </DIV> <DIV><SPAN class=3D909474819-08101998><FONT color=3D#000000 face=3DArial = size=3D2>Finally, I apologize for making so many blatant commercial = posts, but I=20 can't promise to stop right away. As many of you know, I am in the = process of=20 closing Underwater Applications (I have a "real" job now). I = still=20 have close to $40,000 (my cost) worth of inventory remaining and I have = to get=20 rid of it. If someone offered me anything close to that amount for = everything, I=20 would deliver it, along with assembly and machinist drawings, my = accounting=20 software (with all customers and vendors), the whole company without a = second=20 thought. Unfortunately, it looks like the inventory is going to slowly = trickle=20 out (at the current rate it will take 2 years or more) or become = absorbed into=20 my personal supply of equipment (what am I going to do with that 8 foot = long=20 piece of 2" diameter solid stainless steel???). = </FONT></SPAN></DIV> <DIV> </DIV> <P><FONT face=3DArial size=3D2>Sincerely,</FONT> <BR><FONT face=3DArial = size=3D2>C.=20 Randy Bohrer, President</FONT> <BR><FONT face=3DArial = size=3D2>Underwater=20 Applications Corp</FONT> <BR><FONT face=3DArial size=3D2>15 Brewster = Rd</FONT>=20 <BR><FONT face=3DArial size=3D2>Framingham, MA 01702</FONT> <BR><FONT = face=3DArial=20 size=3D2>tel: 508-628-9520</FONT> <BR><FONT face=3DArial = size=3D2>fax:=20 508-820-3337</FONT> <BR><FONT face=3DArial size=3D2><A=20 href=3D"http://www.geocities.com/~uwapplications"=20 target=3D_blank>http://www.geocities.com/~uwapplications</A></FONT></P> <DIV> </DIV></BODY></HTML> ------=_NextPart_000_0033_01BDF2D6.58D35550-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. 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