We use a gross leak tester here which is a large tank full of FC-40.  The
FC-40 is at 130C +/- 5C. We look for a stream of bubbles.   Helium gas (fine
leak) is not a good test when you have a big gap because the Helium will no
longer be present by the time the part is in Air.  That is why for hermatic
package, the package is tested for fine leak followed by a gross leak test.

Gus Abu-Hamdeh
Maxtek Component Corp.
2905 Southwest Hocken Avenue
Beaverton, OR 97005
(503) 627-2393


> -----Original Message-----
> From: Steffen, Don E [SMTP:[log in to unmask]]
> Sent: Thursday, February 15, 2001 5:34 PM
> To:   [log in to unmask]
> Subject:      [TN] Method of Leak Testing
>
>
> Technetters
>
> I am a Quality Engineer on a Safety Product that has a Leak Test
> requirement. We are using a die cast aluminum housing that has a porosity
> issue. I want to find out if there are any one in the TECH NET world that
> might have some experience in leak detection methods. Water is out of the
> picture. Because of the vertura effect, water can be sucked into a
> housing. I am presently using water for troubleshooting purposes, but
> everything that is applied to water is scrap. I have tried Helium gas but
> this is not always reliable and repeatable. Is there anyone out there that
> can help me out in this dilemma?
>
>
>
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