Oxygen compatible grease

Euge

I was wondering if anybody has used any other brands of o2 compatible grease? I came across a product called Krytox, it says it is o2 safe.

There was a site selling this stuff for £5.99 for 10g - not a bad if its OK.

jcolley

Works fine for the US Navy for our divers and O2 systems.

diverrob

It was used extensively in the Canadian Navy as well but we have switched to Cristo Lube now (not sure why)

Bill Pringle

Castrol makes Braycote 601EF lube NASA approved for manned space flight HP 02 applications being the Micronic version for ultra clean/pure systems, it is quite spendy.
The 803 is nearly the same composition less the ultra clean credentials is a lot less money and perfect for HP O2 systems not having to be built in a clean room for a space station.

There is also Cristolube, have seen and used it as well away from work at the dive shop, appears identical to the braycote lube, lots of traffic on the web on this stuff but not sure whom makes it.

And the before noted Krytox 240AC is also used in military O2 breathing systems but we have typically used in a few older programs at much lower pressure applications. less than 500 psig.

Difference between the Bracote/Cristolube & the Krytox from an applications standpoint is the Krytox will with time breakdown seperate the polymers from oils where the braycote/Cristolube does not. Our techs just like the Castrol stuff better.

From a costs standpoint you may want to check out the Cristolube or the Braycote 803, but I doubt that it will beat the Krytox in price.

At the end of the day all these lubes will work fine for diving O2 systems.

iain-hsm

IMHO Sounds too much for too little. remember a small 2oz tube is 56g
So your 10g is insignificant. Dont waste your time.

If you do go ahead and buy it make sure its new in a sealed tube with the full company product details on the tube and has a batch code printed on the reverse label. Too much ex WD old crap, or reloaded into smaller tubs with the bum hairs and fluff picked out, re labled and hawked on Ebay by low lifes.

Do a search Locktite Dupont Krytox RFE part 29711. if either U.S. or Europe.

Attached Images

Krytox 1.jpg (105.6 KB, 252 views)

jmhardingjr

Anyone used Fomblin or Halocarbon?

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". . . the sea's in my veins, my tradition remains, I'm just glad I don't live in a trailer . . ."

Bill Pringle

Halocarbon lubricants scored well within the O2 compatibility database, however no experience with using it, not sure of out gassing or toxicity levels
Did not see anything under Fromblin.

Did a little searching around on the web and came across the attached, does a good job describing the how and why of O2 clean & compatible breathing systems.


ENGINEERING NITROX PARTIAL PRESSURE BLENDING SYSTEMS © 2001

Skeletor

I use Krytox and I haven't blown up yet

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Gobfish1

I use Molykote medium 33 , not gone bang as yet

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Steve G

Apparently not the only gay diver in the village

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n2diving

I've used and sold Christo-lube for years with no problems.... Christo-lube is Lubrication Technologies brand name for a huge range of halocarbon based lubricants; many of which are not suitable for use in breathing gas applications. Only Christo-lube MCG-111 (dynamic seals) and Christo-lube MCG-129 (static seals) are commonly used in the recreational diving industry. (Note: Christo-lube MCG-111 lubricant should not be confused with Dow Corning 111, a silicone lubricant absolutely not suitable for oxygen environments).

Bill's comment about Krytox explains something I've personally observed... after tubes of Krytox sit around for a long while it comes out of the tube in a state I can best describe as 'gritty'... rub it around for a minute and the 'grit' disappears...