Biddie_fiddler
Well-Known Member
- Messages
- 332
- Location
- Perth, WA
Direct from Freudenberg Sealing Technologies (FST) themselves- a manufacturer of O’Rings:
“Generally silicone o-rings don’t go well in silicone oils, Nitrile should be good with silicone oils. If they are in fact using silicone o-rings in silicone oils, there maybe some additive that is being used that requires the silicone o-rings that we don’t know of. Silicone can take high temperatures and has a long life, but they are not a very good dynamic seal due to low abrasion resistance. They would be okay in a static application though”
I don’t know why, but silicone orings have very poor chemical resistance to silicone based oils. Every site that labels chemical resistance for their silicone orings all state this.
I’m not gonna lie, I feel like this is done on purpose so replacement parts are required more often. You seen the price for replacement orings?!
from Australia’s FST branch, they’re 23c each (and this is for low quantities)! From the hobby store it costs $16 for 8. WTF!!!
I bought 20 orings for $10 today
10 6x2mm and 10 6x2.5mm. Gonna see if I can squeeze the 2.5mm in the diffs xD
“Generally silicone o-rings don’t go well in silicone oils, Nitrile should be good with silicone oils. If they are in fact using silicone o-rings in silicone oils, there maybe some additive that is being used that requires the silicone o-rings that we don’t know of. Silicone can take high temperatures and has a long life, but they are not a very good dynamic seal due to low abrasion resistance. They would be okay in a static application though”
I don’t know why, but silicone orings have very poor chemical resistance to silicone based oils. Every site that labels chemical resistance for their silicone orings all state this.
I’m not gonna lie, I feel like this is done on purpose so replacement parts are required more often. You seen the price for replacement orings?!
from Australia’s FST branch, they’re 23c each (and this is for low quantities)! From the hobby store it costs $16 for 8. WTF!!!
I bought 20 orings for $10 today
10 6x2mm and 10 6x2.5mm. Gonna see if I can squeeze the 2.5mm in the diffs xD