Nitrile O-rings

[mendozer]

Nitrile Butadiene is the material of the brasscraft o-rings at lowes. They're for sink repair. I used one today on my bulkhead install (along with cooler gasket) and it doesn't seem to leak with my leak test. Many people recommend silicone o rings or hose gaskets. However, nitrile doesn't seem to be unsafe when I looked into it.

Anyone share any advice?

 

[kosmokramer]

I work for a rail tank car company that maintenances cars that haul nasty chemicals all the way to welches grape juice and seagrams whiskey... nitrile is normally not used in food grade cars. Im not sure if its bad for you but on food grade is mostly white neoprene or buna if im thinking correctly right now

 

[mendozer]

http://www.fastenal.com/web/products/detail.ex?sku=1166847

something like this? Buna-N

 

[kosmokramer]

Actually after looking online it has buna-n and nitrile as the same material. I saw epdm as fda approved but dont recall ever using it on food grade cars, I think you will be okay with the nitrile or buna but i am not sure till i get to work and ask our material expert.

 

[Clementine]

food safe is one thing but food safe at elevated temps is another, lots of stuff that is food safe emits nasty stuff when heated outside its normal temp range.

Clem

 

[mendozer]

well the buna-n says it's good up to 250 F. The nitril one from lowes doesn't specify. although if it's the same thing, then great. Nitril but is used in o-rings in the food industry. At the creamery i worked at, we had o-rings like this, but i wasn't certain on THAT material

 

[BargainFittings]

Good resource for usage and specifications for materials

Nitrile o-rings

http://www.efunda.com/designstandards/oring/oring_chemical.cfm?SC=none&SM=Buna-
N%20%28Nitrile%29#chem