Canning Jar Gasket ?

[matt_m]

Anyone have a source for a silicone gaskets for canning jar accessories like those made by Norcal? I know I can obviously get them from Norcal but I usually buy this kind of stuff from McMaster Carr in bulk. Unfortunately I'm not seeing anything like it.

 

[matt_m]

Answering my own question, I found these on Amazon that seem to work well. They go under the lid and seal to the jar and disc. They are substantially thicker and probably a little softer and seem to seal more easily. Remains to be seen how they'll hold up to Starsan, but the originals don't either.

https://www.amazon.com/gp/product/B07MVPPGRF/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

 

[CascadesBrewer]

What are you using the jars for? For storing yeast I have swapped over to use the plastic lids. Like these: White Plastic Standard Mason Jar Lids (24-Pack); Regular Mouth Lined Storage Caps - Walmart.com

 

[matt_m]

I have some of the Norcal CO2 harvesters and the gaskets have been failing due to Starsan exposure.

But I do use those plastic lids for storing yeast.

 

[day_trippr]

Do not use silicone for sealing anything over an extended period because that material literally cannot actually seal anything over an extended period...

Cheers!

 

[DuncB]

@day_trippr
I'm looking at getting some spare o rings for keg posts, fermentasaurus etc.
Have seen some suggest different types for the keg posts including silicone for the liquid post, I was thinking NBR all sites but have seen fluorine orings and wondered about their properties
https://www.aliexpress.com/item/4000866414327.html?spm=2114.12010612.8148356.8.a4aa7e2fAI6gxt

 

[day_trippr]

Fluorine rubber (FPM or FKM) is a rather remarkable compound with all kinds of positive characteristics, but for our use the very low gas permeability is attractive. That said, I bought a 100 count of industry standard Buna-N ball lock post O-rings for small $$ a few years ago and still have around 90 of them

Cheers!

 

[DuncB]

@day_trippr I read that thread with a lot of to and fro ing about silicone o rings, petroleum lube, silicone lube and the Buna N from Mc somewhere in USA.
So if I can find some 16 mm external diameter and 3mm cross section Fluorine orings would be okay for the gas posts and then I'll be colour coded as well to reduce idiocy risks.

 

[day_trippr]

Well, there are certain incompatibilities one must acknowledge, and using silicone grease on silicone o-rings is one of those "Don't Do That" unless you want to have dissolved rubber rings deposited inside your disconnects. In kind, don't use petroleum grease on Buna-N for the same reason. Which makes the solution easy: use Buna-N 'rings and silicone lube....

Cheers!

 

[DuncB]

Thanks @day_trippr I had remembered that from the previous thread, I did think that Nitrile rubber was pretty impervious to petrochemicals and nasty stuff. The gloves I use at work resist all kinds of chemicals, normal latex hopeless, but those Buna-N rings and NBR rings are not pure ?
Thanks for the advice.