[time-nuts] Hydrogen Maser KIT! Update #1

Chuck Harris cfharris at erols.com
Mon Nov 3 11:53:31 EST 2014

Our standard cleaning regimen for glass (as I recall
from when I was in gradual school), was:

1) wash in detergent in hot water
2) dip (not soak!) in 10% HF/distilled water solution
3) neutralize in dilute NaOH (KOH) water solution
4) rinse in distilled water

And for a final clean:

1) scrub with detergent in hot water
2) rinse in very hot water
3) rinse with distilled water
4) rinse with pure methanol

Aqueous and teflon don't seem to go together in my mind.

I think my first choice would be vacuum deposition, which
is very easy.

Second choice would be acetone and teflon dispersion followed
by a 200C high vacuum bake.

I have a strong feeling that simply spraying from a can of
teflon dry lubricant followed by a 200C high vacuum bake
would work just as well.  It seems to be a hexane/butane
dispersion of teflon powder, and nothing else.

-Chuck Harris

cdelect at juno.com wrote:
> Coating the bulb with Teflon involves coating the inside with a Teflon
> liquid aqueous dispersion, letting it dry, and then curing it in an oven
> at 380 to 400 degrees C for around 30 minutes while circulating dry air
> through the bulb.
> A little bit intricate but doable. Main concern is getting the bulb
> surface absolutely clean before coating.
> A hydrofluoric acid rinse is a must!
> Cheers,
> Corby
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