Borax & Devitrification

Borax & Devitrification

Post by Kasob Suphasi » Tue, 04 Aug 1998 04:00:00



I tried using borax to prevent devitrification and got good result.
However, I have some concern on safety of this chemical. Is it save to
use borax with food-contacting surface of the glass.?

Thank you,

Kasob S

 
 
 

Borax & Devitrification

Post by Steve - RH Linux Use » Sat, 08 Aug 1998 04:00:00


(mailed & posted)

Quote:

> I tried using borax to prevent devitrification and got good result.
> However, I have some concern on safety of this chemical. Is it save to
> use borax with food-contacting surface of the glass.?

  I've used borax before with fair results also.  Borax itself is a
pretty benign chemical, but what happens at 1500F leaves boron
compounds other than borax.  I don't recall ever having seen anything
one way or the other about the safety issues of using borax on
food contacting vessels.   When in doubt, I'd say don't use it.

  What I can say is that TSP (trisodium phosphate), the active
ingredient in Super Spray, has been tested and found to be safe for
that use.

--
Steve Ackman                                        
Metamorphosis Glassworks Page         http://people.delphi.com/stackman
GLASS HOST & Assistant Manager    of     The Delphi Arts & Crafts Forum
                     http://www.delphi.com/crafts

 
 
 

Borax & Devitrification

Post by L.B.N » Tue, 11 Aug 1998 04:00:00


Hi Steve,
Is this borax the washing compound?  At what strength did you use it?

I have used spray A with good results.  I thought there was ground glass
in that solution and that the glass is what prevented the
devitrification.

TWLARRY


Quote:

> (mailed & posted)


> > I tried using borax to prevent devitrification and got good result.
> > However, I have some concern on safety of this chemical. Is it save to
> > use borax with food-contacting surface of the glass.?

>   I've used borax before with fair results also.  Borax itself is a
> pretty benign chemical, but what happens at 1500F leaves boron
> compounds other than borax.  I don't recall ever having seen anything
> one way or the other about the safety issues of using borax on
> food contacting vessels.   When in doubt, I'd say don't use it.

>   What I can say is that TSP (trisodium phosphate), the active
> ingredient in Super Spray, has been tested and found to be safe for
> that use.

> --
> Steve Ackman
> Metamorphosis Glassworks Page         http://people.delphi.com/stackman
> GLASS HOST & Assistant Manager    of     The Delphi Arts & Crafts Forum
>                      http://www.delphi.com/crafts

 
 
 

Borax & Devitrification

Post by STACK.. » Tue, 11 Aug 1998 04:00:00



   >Hi Steve,
   >Is this borax the washing compound?

  Yes.

   >At what strength did you use it?

  It's been quite a while, but I'll guess it was maybe a tablespoon or
so in a half gallon of water. (maybe a quart)  I really don't remember.

   >I have used spray A with good results.  I thought there was ground glass
   >in that solution and that the glass is what prevented the
   >devitrification.

  There is ground glass in Spray A.  There's also TSP, which I believe
acts as a flux.  Borax certainly acts as a flux.

  Devitrification is the crystalization of silicon compounds on the
surface of the glass.  Fluxes prevent that crystalization from taking
place and keep those compounds glass.

 - Steve