Best O-ring material

scorpora · June 20th, 2007, 08:22 AM

Now we got the dash number for the O-rings, the next is which is the best material for the lights O-rings: VITON, SILICONE, NEOPRENE, PTFE, EPDM, FEP or POLYURETHANTE

I just receive the book from airspeed press and doesn´t say anything about this.

Scopora.

Woz · June 20th, 2007, 12:13 PM

Depends what you are sealing. O rings on your reg tend to be 90 shore A EPDM or nitrile. Sometimes viton but personally I prefer EPDM for O2 use as viton gives off some real nasties when burning. For light cannisters then a softer material would be better, say a 70 shore A nitrile as you need to conpress it a little. Dont bother with silicone (too soft and easily damaged), polyurethane (too expensive), PTFE (too hard and has no memory), any of the flouro compounds (incredibly expensive). Nitrile should be fine and they are pennies.

scorpora · June 20th, 2007, 12:43 PM

Thank you this is the information need it.

jluttichau · June 20th, 2007, 01:11 PM

Quote: (Originally Posted by scorpora)

Now we got the dash number for the O-rings, the next is which is the best material for the lights O-rings: VITON, SILICONE, NEOPRENE, PTFE, EPDM, FEP or POLYURETHANTE

I just receive the book from airspeed press and doesn´t say anything about this.

Scopora.

For me it's a question of using Viton or EPDM, Viton self-ignites at 100 degree higher then EPDM (so it's safer) but Viton contains flour and seems to break apart easily so I'm leaning towards EPDM because temperatures can reach up to 500 degress and i would rather not get a dose of flourgas when one of those viton o-rings oxidizes..

Cheers
Jonas

June 20th, 2007, 08:22 AM	#1 (permalink)
scorpora(Offline) Next please Join Date: May 2006 Location: spain Posts: 133	Best O-ring material Now we got the dash number for the O-rings, the next is which is the best material for the lights O-rings: VITON, SILICONE, NEOPRENE, PTFE, EPDM, FEP or POLYURETHANTE I just receive the book from airspeed press and doesn´t say anything about this. Scopora. Last edited by scorpora; June 20th, 2007 at 08:24 AM. Reason: forgott something

June 20th, 2007, 12:13 PM	#2 (permalink)
Woz(Offline) New Member Join Date: Dec 2005 Location: Nottingham Posts: 246	Depends what you are sealing. O rings on your reg tend to be 90 shore A EPDM or nitrile. Sometimes viton but personally I prefer EPDM for O2 use as viton gives off some real nasties when burning. For light cannisters then a softer material would be better, say a 70 shore A nitrile as you need to conpress it a little. Dont bother with silicone (too soft and easily damaged), polyurethane (too expensive), PTFE (too hard and has no memory), any of the flouro compounds (incredibly expensive). Nitrile should be fine and they are pennies. __________________ www.kitfondle.co.uk Lots of shiny diving tatt for you to spend money on Last edited by Woz; June 20th, 2007 at 01:32 PM.

June 20th, 2007, 12:43 PM	#3 (permalink)
scorpora(Offline) Next please Join Date: May 2006 Location: spain Posts: 133	Thank you this is the information need it.

June 20th, 2007, 01:11 PM	#4 (permalink)
jluttichau(Offline) Custom User Title Join Date: Nov 2005 Location: Denmark Posts: 437	Quote: (Originally Posted by scorpora) Now we got the dash number for the O-rings, the next is which is the best material for the lights O-rings: VITON, SILICONE, NEOPRENE, PTFE, EPDM, FEP or POLYURETHANTE I just receive the book from airspeed press and doesn´t say anything about this. Scopora. For me it's a question of using Viton or EPDM, Viton self-ignites at 100 degree higher then EPDM (so it's safer) but Viton contains flour and seems to break apart easily so I'm leaning towards EPDM because temperatures can reach up to 500 degress and i would rather not get a dose of flourgas when one of those viton o-rings oxidizes.. Cheers Jonas