Crucibles for NP

[Principefly]

To preserve the crucible (for casting NP with torch) use you any particular substance?
Do you clean by sandblasting or use them a few times and then throw them away?

 

[DMC]

Rub White Flouride Flux on the surface, then into oven, then pull out and flame with torch,.

repeat untill nice glaze forms.

This is what I do to all crucibles before use.

 

[corona]

Rub White Flouride Flux on the surface, then into oven, then pull out and flame with torch,.

repeat untill nice glaze forms.

This is what I do to all crucibles before use.

you are a plethora of knowledge *** . good tip

 

[DMC]

Watch out!

Some of my info is pure bologna! LOL

 

[charles007]

To preserve the crucible (for casting NP with torch) use you any particular substance?
Do you clean by sandblasting or use them a few times and then throw them away?

The best way to preserve your crucibles is to place them in the burnout oven and buy the slotted ones..
You cast much faster when preheat.....and don't try to save pennies, just replace..

 

[Principefly]

For ***:
Do not know "rub white Flouride" please give me an example .. name and brand of a product?
Thank you.
For Charles 007:
Preheating always crucibles, however, will form immediately after the first fusion already, a layer of oxides.
Do not ever want any particles of oxide or part of the crucible was incorporated in the NP ..
thanks

 

[DMC]

https://www.americandentalsupply.net/store/product.php/341.htm

It is exactly that......Flouride flux. Simple google search my friend!

Call Nobil Metal and order some. www.nobilmetal.com

Ask for Christiana Ossi. It is in Italy, of course.


Scott

 

[Principefly]

Ok Scott thanks!
I tried doing a search with google .. but obviously I am not smart enough!

 

[charles007]

For Charles 007:
Preheating always crucibles, however, will form immediately after the first fusion already, a layer of oxides.
Do not ever want any particles of oxide or part of the crucible was incorporated in the NP ..
thanks[/QUOTE]
For Principefly,
Call any companiey that makes NP... that's where I learned it from... back in the 80's
Incorporating pieces of your crucible in NP,, just how many years old is your crucible ? really

If I wanted to go back to using np and casting between .1 and .2, it takes a hot crucible, and a clean one to not have problems with my porcelain..

 

[CatamountRob]

Principefly,
Is the oxide layer (slag) sticking to your crucible after you cast it? It shouldn't, it should just peel away cleanly. If it isn't you are probably overheating.
Season your crucibles with flux as Scott suggests and I preheat in the burnout furnace as Charles does.