Re: Question for you guys that are tech savvy
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The FDA certification will make them more expensive, but at $3.68 for 20 of them, I doubt it's all that significant! I identify as a cheap bastrich, but even I won't worry about that! ;) Bill in OKC William R. Meyers, MSgt, USAF(Ret.) Aphorisms to live by: Good judgement comes from experience. Experience comes from bad judgement.? SEMPER GUMBY! Physics doesn't care about your schedule. The only reason I know anything is because I've done it wrong enough times to START to know better. Expect in one hand, expectorate in the other. See which one gets full first.
On Saturday, July 15, 2023 at 10:42:58 AM CDT, Jkle379184 via groups.io <jkle379184@...> wrote:
From the package labels, I think that the 70 Duro is the measure of hardness on the shore scale, White is the color, FDA is FDA approved, NBR is the compound - Buna- Nitrile. All I know is they were cheap and have worked for a long time for me.? ?Jeff
On Saturday, July 15, 2023 at 11:29:30 AM EDT, Andrei <calciu1@...> wrote:
If the o-ring is made of buna-n that it is buna-n. The color does not change the chemistry.?
Maybe color coding O-rings would help avoid something as erroneous as placing an EP O-ring where a nitrile O-ring ought to be. The industry's answer to this was to designate black for nitrile, brown for fluorocarbon, red for Neoprene, rust for
Silicone, blue for fluorosilicone, and purple for EP.
The FDA designation means that it can be used in manufacturing places where food or drugs are processed because the Buna-n material is safe and does not leach any chemicals.
Andrei?
Get From: [email protected] <[email protected]> on behalf of Jkle379184 via groups.io <jkle379184@...>
Sent: Saturday, July 15, 2023 11:20:59 AM To: [email protected] <[email protected]> Subject: Re: [Unimat] Question for you guys that are tech savvy ?
Ok, I am on a learning curve right now. It looks like the color is important, the industry uses the color of the O ring as a code to tell what it is made of. I got lucky years ago when I ordered the white ones. Here is a link
to what the colors mean.
And here is data on the white ones that I have
If you do a web search of -334 or -339 Oring 70 Duro White FDA NBR you will find many sources for them.
Here is a data link for the black ones
Jeff
On Saturday, July 15, 2023 at 10:24:49 AM EDT, Jkle379184 via groups.io <jkle379184@...> wrote:
I got them on Ebay a few years ago, they are? a standard size O ring. I will check my notes to see if I wrote down the O ring sizes.
?Jeff
On Saturday, July 15, 2023 at 09:23:12 AM EDT, OldToolmaker via groups.io <old_toolmaker@...> wrote:
Hello Jeff,
Where do you purchase your white buna belts? Dick -- http://www.homemadetools.net/ forum/?OFF- SET-tailstock-center-65965#post105972 ?SMALL TURRET TOOL POST PLANS? ?LARGE TURRET TOOL POST PLANS ?MINI- LATHE CARRIAGE LOCK PLANS ?SMALL QC TOOL POST PLANS? ?QUICK CHANGE LATHE TURRET ?MINI LATHE COMPOUND PIVOT MODIFICATION |
Bill in OKC too