Thanks Mike,
Silver elastomers, that was something. As you may understand, the main purpose of the gasket is, not to gas seal, but fill all small mechanical mismatches between flanges, so that the EM feels a continous guide and no irregularities. May seem to be an exaggeration, but at Ku-band or higher, matching is extremly worthful, especially talking about low power radars for flying purpose. Anyway, I will consider the silver based polymer also.
As for bubbling, I can tell you the first demijohn is still jumping. I will make another one, some wonderful fruits soon ready. Learned that long storage will make them juicier. Will send you a small taste sample next millenium.
Ingemar Hernefjord
Ericsson Microwave Systems
Ingemar: Indium is used for gaskets and similar becuase it is very soft and deforms
easily, retains softness over a wide range of temps (down to cyrogenic). Tin would
probably be too hard, but some people do use tin/indium alloys to cut costs a bit. also
being slightly harder makes big washers / floppy shapes easier to handle. You can also use
silver based elastomers from specialist suppliers.
ps How's the bubbling.
Mike Fenner
Bonding Services & Products
T: +44 1295 722992
F: +44 1295 720937
For product info visit www.belzona.com
----- Original Message -----
From: Ingemar Hernefjord (EMW) <[log in to unmask]>
To: <[log in to unmask]>
Sent: 19 November 1999 07:24
Subject: [TN] Ku-band waveguide gasket
> Hi, an unusual question, but I see many radar guys are reading also in TechNet. So, what
sealing gaskets do you use for flange-to-flange sealing, electrically as well as gas
tightening? We tried Indium, works well, but the price is immense. If the waveguide is
ordinary Al with Nickel+Chromate, then what about Tin gaskets? Atmosphere around is dry
and you have that Nickel barrier. Copper seems to be too hard. Any good idea?
> Ingemar Hernefjord
> Ericsson Microwave Systems
>
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