Brazing Antiflux Needed

adh2000 · Mar 25, 2019

Google produces a few product advertisements, but which ones are good? I'm brazing steel tube into a fitting. The fitting has a 1/4-28 tapped hole on the side and I don't want the brass to flow into it. What can I use to plug the 1/4-28 hole to prevent that?

Gazz · Mar 25, 2019

I believe red ocher is what silversmiths use.

Dumpster_diving · Mar 25, 2019

Eutectic mask from a spray metal kit? Just a guess, haven't tried it.

sfriedberg · Mar 25, 2019

Fire clay? Refractory oven/fireplace caulking?

Limy Sami · Mar 25, 2019

Tippex works for me Tipp-Ex Rapid 20ml Correction Bottle 1 Pack: Amazon.co.uk: Office Products

Zahnrad Kopf · Mar 25, 2019

I've used high temperature crayon in the past, but don't have any on hand at the moment to give brand names. Carbon soot also works, as does graphite. And, white out... :smoking:

Froneck · Mar 25, 2019

Not sure about brazing if using a copper alloy but I have used #2 pencil "Lead" when not wanting Silver Solder to go where I didn't want it. Simple took a #2 pencil and colored the area I didn't want silver solder to flow.

jim rozen · Mar 26, 2019

It's called 'stop off' and I think handy and harmon sells it. Somebody once told me milk of magnesia
(mag sulfate) will work also. Try it on a test piece first.

edwin dirnbeck · Mar 26, 2019

Try a titanium screw .They are not real expensive ,heat wont bother them and nothing seams to stick on them .Edwin Dirnbeck

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Brazing Antiflux Needed

adh2000

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Dumpster_diving

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sfriedberg

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Limy Sami

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Froneck

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jim rozen

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