Dive computer battery and o-ring spec's

[outofofficebrb]

I ordered from the same place (The O Ring Store) and they shipped SO quickly. I wonder what my postman thought I was ordering....

 

[rnln]

Thanks GJC and Couv,
yeah, haha.
I see the different are "E70 EPDM FDA" and "B70 (NBR) Buna-N Nitrile". I have no idea what those mean. Do you know which is better?
Thanks again.

Also, I have question on silicon lube. I do have white silicone grease at home, using on cars and others things around the house. I know that there are many different kinds of silicone lube/grease out there, some are good and some are not for rubber. Also we need silicone lube when servicing regulators too. On regulators, the devices we are all breathing from; therefore, I want to be careful on this? May I ask what kind of silicone lube everyone is using?
Again, thank you very much.

 

[outofofficebrb]

Thanks GJC and Couv,
yeah, haha.
I see the different are "E70 EPDM FDA" and "B70 (NBR) Buna-N Nitrile". I have no idea what those mean. Do you know which is better?
Thanks again.

Also, I have question on silicon lube. I do have white silicone grease at home, using on cars and others things around the house. I know that there are many different kinds of silicone lube/grease out there, some are good and some are not for rubber. Also we need silicone lube when servicing regulators too. On regulators, the devices we are all breathing from; therefore, I want to be careful on this? May I ask what kind of silicone lube everyone is using?
Again, thank you very much.

From my brief research, the 70 is the durometer and E or B is the material. In the case of B70 it is Buna Nitrile (NBR also denotes this).

I asked this question about lube recently and someone suggested I get Christolube MCG111 and that would be good for all o-rings regardless of material.

 

[rnln]

Thanks outofofficebrb,
How about inhaling it? Anyone ever researched or talked about this topic? Sorry I am too new to this game and have not read enough.
Thanks.

 

[rnln]

a quick search and found a safety sheet. I'll search more but at least feel better. One thing though: "This chemical is not considered hazardous ...." then another portion say "May be harmful if swallowed. May be harmful in contact with skin"

 

[Couv]

One of the reasons I use EPDM or Viton is that they have a very long shelf life. Notice the O-ring store has a minimum order of 12 for the -026 seal. So even at one a year, in a dozen years from now, you'll may still have some of the same seals. Most sources list the shelf life of EPDM and Viton as indefinite where Buna/Nitile is not.

Most of us use a PTFE grease (Teflon based) like Christolube, Tribolube, Krytox etc because that's what regulator manufactures recommend. BUT there is nothing wrong with a quality silicone grease (except on silicone o-rings) like Dow Corning 111 for seals used in a regulator where the richest oxygen mix will be 40% or less. In fact, silicone grease is more tenacious than PTFE and will provide better/longer anti-corrosive protection than PTFE. PTFE does get the nod for being superior when it comes to anti-friction though.

 

[outofofficebrb]

One of the reasons I use EPDM or Viton is that they have a very long shelf life. Notice the O-ring store has a minimum order of 12 for the -026 seal. So even at one a year, in a dozen years from now, you'll may still have some of the same seals. Most sources list the shelf life of EPDM and Viton as indefinite where Buna/Nitile is not.

Most of us use a PTFE grease (Teflon based) like Christolube, Tribolube, Krytox etc because that's what regulator manufactures recommend. BUT there is nothing wrong with a quality silicone grease (except on silicone o-rings) like Dow Corning 111 for seals used in a regulator where the richest oxygen mix will be 40% or less. In fact, silicone grease is more tenacious than PTFE and will provide better/longer anti-corrosive protection than PTFE. PTFE does get the nod for being superior when it comes to anti-friction though.

What’s the shelf life on Buna/nitrile? Great info. Thanks.

 

[Couv]

What’s the shelf life on Buna/nitrile?

15 years according to some sources O-Ring Shelf Life | Global O-Ring and Seal

15 years is a long time-unless 10 or 12 have already passed on the shelf of a vendor.

In a former life where we had inspectors who wrote us up for such things; I saw my work place get written up a few times for expired shelf life items including o-rings.

 

[rnln]

ok, conclusion, battery for Oceanic VT4: CR2450

For o-ring material, E70 EPDM FDA is better. Get this o-ring for Oceanic VT4
AS568-026 E70 EPDM FDA O-Ring 70 Duro Black [E70026] : The O-Ring Store LLC, We make getting O-Rings easy!

For lubricant, get PTFE grease (Teflon based) like Christolube, Tribolube, Krytox. Silicone grease is not good for silicone rubber.
GENUINE CHRISTO-LUBE MCG-111 OXYGEN ORING LUBE 5g SQUEEZE TUBE MFG PACKAGING 708325510203 | eBay

Thanks much to Couv, OutOfOfficebrb, GJC, and everyone

 

[chillyinCanada]

Thanks outofofficebrb,
How about inhaling it? Anyone ever researched or talked about this topic? Sorry I am too new to this game and have not read enough.
Thanks.

Your post gave me a bit of a chuckle, as I read it late and without having refreshed my memory by reading the posts that went before it.