Epoxy Pressure Sealing
Epoxy Pressure Sealing
(OP)
Please can someone advise on the best epoxy to use for pressure sealing?
I am trying to seal a cavity on top of an RF filter which contains the tuning screws. The unit is pressurised to 3.5bar and the leak rate has to be better that 5cc/hr.
We have tried eccobond type epoxies, but after aging it begins to leak around the ends of the epoxy seal.
I think that the epoxy is not sticking properly to the filter housing (aluminium, painted with two part black epoxy paint).
We have tried stripping the paint off to leave bare metal but the epoxy still seems to leak at the edges as if it has crept away.
I don't think we are using the right epoxies (eccobond and the like are adhesives or used for encapsulating components, not for pressure sealing).
Any suggestions?
I am trying to seal a cavity on top of an RF filter which contains the tuning screws. The unit is pressurised to 3.5bar and the leak rate has to be better that 5cc/hr.
We have tried eccobond type epoxies, but after aging it begins to leak around the ends of the epoxy seal.
I think that the epoxy is not sticking properly to the filter housing (aluminium, painted with two part black epoxy paint).
We have tried stripping the paint off to leave bare metal but the epoxy still seems to leak at the edges as if it has crept away.
I don't think we are using the right epoxies (eccobond and the like are adhesives or used for encapsulating components, not for pressure sealing).
Any suggestions?





RE: Epoxy Pressure Sealing
Consider trying one of the many elastomeric materials that are available.
RE: Epoxy Pressure Sealing
You should be able to use 5 minute epoxy made by Devcon. Cheap
There is another epoxy that I have used which is called Stycast 2850 made by Emerson & Cuming. This sticks to aluminum very well. This stuff is not reworkable and costs more money than the 5 minute epoxy.
You still have to try each for application.
Tofflemire
RE: Epoxy Pressure Sealing
www.moglice.com
Although sealing is not the primary application it has extremely low shrinkage while curing.
RE: Epoxy Pressure Sealing
Click on the Sonolok and go to Sealing Grades
http://www.parsonadhesives.com/
An Epoxy supplier that I have used is:
www.masterbond.com
RE: Epoxy Pressure Sealing
You might look at Armstrong A-2 and A-706 epoxies. They are both basically the same, but A-706 has a 400 degree F temperature limit and it is a bit harder to work with. A-2 is very simple to use. Good luck.
RE: Epoxy Pressure Sealing
Fingers crossed
RE: Epoxy Pressure Sealing