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-   -   Ferro frit (http://talk.craftweb.com/showthread.php?t=11794)

Franklin Sankar 12-09-2017 07:05 AM

Ferro frit
 
What is ferro frit ?
Can it be used with glass?
Sorry I am in a place with limited access to internet research. But can get ferro frit?.
I know it's open ended but a it's not or it is compatible and is good for now
Thanks.
Franklin

Nick Delmatto 12-09-2017 08:47 AM

I use Ferro Frit to make my own color bars. A nice blue & a green can be made with cullet without changing the COE. I also have a neodimium- selenium pink that only works with batch. If anyone wants some, let me know.

Steven O'Day 12-09-2017 08:49 AM

Ferro frits are made by the Ferro Corporation. They are basically glasses that are finely ground. They are used to introduce substances like lead, alumina and colorants into glaze or clay formulations. They can be used in glass formulas but like everything else that gets thrown in there they need to be added to the calculation for the expansion.

Pete VanderLaan 12-09-2017 09:09 AM

Ferro usually won't tell you what's in them and they will deny they make stuff with certain elements in them. Essentially, frits are silicates with metallic and non metallic oxides glommed onto the silica.

Lead Monosilicate is a frit rendering lead into a condition where you can handle it with no ill effects. It is not a cure all. I suspect Ferro makes encapsulated stuff but will deny it. I am quite sure they did that for the portland shops.

Glomm is a technical term.

Jim Antonius 12-09-2017 05:23 PM

Ferro and PB 83 (Pemco) Glaze Frits
 
About 45 yrs ago, Dan Fenton and I used these glaze frits exclusively for Pate de Verre and lost wax casting. We bought cases of crucibles from DFC (Denver Fire Clay)and made numerous colors for these purposes. Never could get a good red, but the other colors were very nice. Without going thru 40 yrs of notes, i believe the melting point was about 1500f and i think we annealed at about 750_770f.
I have not tried blowing with it, perhaps Nick can enlighten us on the blowing characteristics.
Jim Antonius

Franklin Sankar 12-09-2017 08:23 PM

Thanks everyone. Looks like something to play with and create some excitement.
Franklin

Nick Delmatto 12-10-2017 01:20 PM

1 Attachment(s)
Jim, regarding Ferro Frit, I generally melted approx. 66% cullet, 33% Ferro Frit, & small amounts of silica & or borax. The cullet is factory cullet with a COE 89. I don't know if Ferro designed this frit to fit this cullet. I got both from a factory that went out of business in 2007. I do pull thread tests along with color encased paperweights that I check with polarizing filters for compatibility. This blue is 5.3% CuO (copper oxide) & .43% Co3O4 (cobalt oxide). It works for threading also. I also have black-purple, green & pink Ferro Frit. It works like a normal glass. I hope this answers your question. I've never posted a jpg here before, I hope it shows up.

Larry Cazes 12-11-2017 01:44 PM

Are these glasses themselves or chemical additives to color glasses?

Pete VanderLaan 12-11-2017 06:22 PM

Many are simple silicates. Some are compounding silica, metallic ( or non) and formers and modifiers as well and that's where the makers get really cagey. Zinc and potassium are really conducive to making reds. The blues are actually really easy fall off the log colorants. The issue is keeping the toxin level down in the secondary stacks and that's where they get way cagier still. Ferro does not want to talk. None of the others do either.

Franklin Sankar 12-14-2017 04:39 PM

They look like glass. It will be a surprise to see what color comes out. Wish there was a way to determine what color you get.
The person who sold it said that it is used in pottery to lower the melting point.
Franklin

Pete VanderLaan 12-14-2017 05:07 PM

Franklin: everything lowers the melt point of silica. Everything that does it extracts a price. At a certain point it won't turn back to a recognizable solid. There are defining limits. It is what the entire science of glass chemistry is about.
When do materials with no defined softening point get pissed off?

That's the short version.

Franklin Sankar 12-15-2017 06:13 AM

Thanks Pete . I did not expect much from it but it is interesting discovery for me.
Franklin


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