O-ring

[AlejandroFernandez]

I have to make an O-ring, but I'm using a Buna-N cord (widht 1/2 IN). The question is... How can i joint both ends?. I know I need a glue but which one can I use? and what are my options?

Thanks

Alejandro Fernández
I+D&I
Sitelca

 

[MikeHalloran]

What fluid are you sealing?
What pressure?
What's the circumference of the joined ring?




Mike Halloran
Pembroke Pines, FL, USA

 

[AlejandroFernandez]

Circumference of the joined ring=201 mm
Pressure= 300lb
Fluid=Gas/oil/petroleum
Temp=+100ºF (max)
Transversal section of cord=1/2IN
cord Material =Buna-N
It's will be a Radial seal

Alejandro Fernández
I+D&I
Sitelca

 

[hydtools]

Use cyanoacrylate adhesive, super glue. You can make a square butt joint or any scarf, angled cut joint. Use a very sharp cutting tool to make clean cuts.

Ted

 

[AlejandroFernandez]

Hi Hydtools, wich kind of cut do you recomend me?

Alejandro Fernández
I+D&I
Sitelca

 

[AlejandroFernandez]

cyanoacrylate adhesive produce fragil joint? or is safe to used?

Alejandro Fernández
I+D&I
Sitelca

 

[MikeHalloran]

That's a pretty small ring to be making the hard way.
Small enough to make by casting silicone in a wax mold.

If you have to stretch the ring much for installation, the cyanocrylate may be a problem. It's just about the least awful adhesive for o-rings, but you can't expect miracles.

I could swear that my '70 Mercedes used rings about that size to hang the muffler.

Mike Halloran
Pembroke Pines, FL, USA

 

[saberblue]

There are standard kits available to industrial maintenance people to make O rings -- this type of a kit would give you the jig to cut the ring- hold the ends in place and give you a starting point for your glue .

A.R. "Andy" Nelson
Engineering Consultant
anelson@arnengineering.com

 

[hydtools]

Use a scarf cut. It results in a longer glue line.

Alternatively, you could have a custom o-ring made.
For example:

http://www.epm.com/

Ted

 

[ietech]

Contact the OEM of your unit and buy a supply of the properly sized o-rings depending on your useage requirements.

It takes longer $$$ wise to make one than the o-ring costs (usually)

O-rings are cheap why waste time on them?