I need to dissolve ceramic shell from a bronze cast, and I w...

I need to dissolve ceramic shell from a bronze cast, and I was wondering if there is a liquid solution available to remove the remaining shell. I am a student and the sandblaster is currently being repaired so I am looking for a solution to this.

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red46 avatar
6 years ago #2
Gold Member
Blogs: 2
Forum: 197
Votes: 7

If a true ceramic, as in fired clay, there is nothing short of breaking or sand blasting that will remove it.

6 years ago #3

Hello there, we have also the same problem with ykustec. our sandblasting gun was damaged and we need some solution to remove the ceramic shell - composed of mullite sand and colloidal silica. we tried boiling caustic soda and dip the item for several hours to see if the ceramic shell has softened..

we still have to check so far. but i saw in the internet an ultrasonic cleaning. i don't know if it works.

if you have any suggestions, please share to us...

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darilatkins avatar
6 years ago #4
Platinum Member
Blogs: 16
Forum: 307
Votes: 7

Browse investment casting web sites where the use of high power water jet and liquid nitrogen may be used for your problem.

When I was into bronze casting more than four decades ago we rarely had a problem with removal of the mold. We just broke it away. Probably that's because we used brick dust and plaster. The brick dust was made by pounding the bricks to fine granules. The finest was pounded and pounded to a very fine powder. This was used in the very first layer. Subsequent layers incorporated coarser grains.

5 years ago #5

Hydro florid acid

4 years ago #6
Colin Webster Glasszoo ...

You can use a concentrated solution of Hydroflouric acid (HF) not 'hydroflorid' which does not exist.
Immersion will cause disintegration of the inorganic silicate binder facilitating partial removal, thereafter immersing in a solution of HF and HNO to complete the removal of the ceramic shell.
WARNING HF is extremely dangerous and should only be used under strict control conditions that will ensure no possibility of skin contact or inhalation, the fumes alone will cause serious damage to the respiratory tract and lungs DO NOT IGNORE THIS WARNING.

You can make life easier by first applying a thin coat of a good refractory plaster or zircar based mix and then coating with ceramic shell, this will provide a buffer layer between your glass and the shell material that is easier to remove.

4 days ago #7

You can use a concentrated solution of Hydrofluoric acid (HF) not 'hydroflouric' which does not exist.

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