silicon o-rings from the shoppe

would the size 15 and 17 silicon orings from the sandwich shoppe be a good upgrade to the stock e-series orings on my e2l body? are they better than the rubber?

anyone?

bump

They don't seem that different for me. They are orange. They should hold up better to lubricant - the black ones seem to shed a little even from silicone lube. For 35 cents, how can you go wrong? They're silicone, by the way.

i was under the impression that orange o-ring were made of silicone (and the black ones weren't) and that they can withstand higher tempertures.

would it really make a difference in flashlights?

signed,
clueless

Check out O-rings(dot)com. Their technical center explaines the different compounds o-rings are made of and uses. A good reference.

Mike

thnx adman.

as we can see from the chart below, all standard o-rings are capable of handling temps involved in flashlights.

and unless we know what were actually buying, all we can guess is that if it's red in color, it's silicone and we can eat off it.

---------------------------------------

Standard O-ring Compounds - Info listed is as follows:
Compound/ Description / Temp Range / Duro / Color / FDA food approved:

N100-70 / A general purpose, sulfur-cured Nitrile (Buna-N) compound
-40 to +250F / 70 / Black / No

N168-70 / An FDA Grade, Nitrile (Buna-N) compound
-40 to +250F / 70 / Black / Yes

N140-90 / A sulfur-cured, Nitrile compound for high pressure
-40 to +250F / 90 / Black / No

V700-75 / Dupont-Dow Viton®, with exceptional chemical resistance
-20 to +400F / 75 / Black / No

V708-75 / Dupont-Dow Viton®, with exceptional chemical resistance
-20 to +400F / 75 / Brown / No

S500-70 / FDA Grade Silicone compound for food & medical applications
-80 to +400F / 70 / Red / Yes

E300-70 / FDA Grade EPDM compound for ozone, water & UV service
-65 to +300F / 70 / Black / Yes

An important factor to consider when using o-rings is, a static or dynamic use. For instance, the seal between the bezel and body is a static application vs. the tail switch and body, twisting on and off, a dynamic one.

Quoted from O-rings(dot)com:

Silicones offers poor tensile, tear and abrasion resistance, and are not recommend for use in dynamic applications.

Nitrile materials exhibit excellent tensile strength and abrasion resistance properties.

I hope that helps you decide.

adman! that was very helpful indeed (and explains why i've had problems with "red" o-rings in exactly that situation).

thnx for the explanation buddy!

Glad that helped, Your welcome!

Now, the question is... where are the silicon o-rings on the sandwich shoppe?

also remember that silicone o-rings are quite fragile against chemicals, dont use anything with petroleum on them. buna-n on the otherhand (the most common black ones) can almost take all chemicals IIRC. plus there dirt cheap, you can by a dozen at a dive shop.

Doug,

http://theledguy.chainreactionweb.com/index.php?cPath=48_42&page=2