tongarocks
off to a rocking start
Member since March 2008
Posts: 4
|
Post by tongarocks on Aug 23, 2008 11:18:53 GMT -5
I'm attempting to tumble scrap glass collected from a local glass factory.
Even though I've added baking soda to the mix, after about 12 hours the gas buildup is still blowing the top off of the tumbler.
Does anyone have any suggestions?
Thanks
|
|
|
|
Post by akansan on Aug 23, 2008 11:51:49 GMT -5
I'd try borax, if you haven't already.
|
|
|
|
Post by connrock on Aug 23, 2008 16:50:36 GMT -5
I think it's the nature of the beast.Every time I tumble glass I have the same problem. Gas is caused by organic material and for some reason glass must have some in it. Although I've had gas problems I've never had my top blow off. What brand tumbler do you have? Some folks use BEANO instead of baking soda?  ? connrock |
|
Roan
has rocks in the head
Member since January 2008
Posts: 600
|
Post by Roan on Aug 23, 2008 16:53:35 GMT -5
I've a thread on gas  Try chalk, Tums and/or some other antacid. Anything that is calcium carbonate. Sodium, baking soda, doesn't work as well IMO. You could also add some rough rock in that has calcium carbonate in it. Some marbles do. Eileen ETA: by "marbles" I mean marble rock, not glass marbles Like Picasso marble. |
|
|
|
Post by LCARS on Aug 24, 2008 14:15:54 GMT -5
For the record: Adding baking soda or borax to your tumbler DOES NOT reduce off gassing!  If anything, baking soda will actually produce carbon dioxide gas in reaction to any weak organic acids present. For some reason, many people seem to be misinformed about using additives to reduce off gassing when tumbling glass. Frequent checking and "burping" of barrels primarily containing glass is the simplest & most effective way of dealing with gas build up. I am not a chemist by trade but I have tumbled a fair amount of glass in my time and I noticed that the only time it produces gas is during the SiC grinding phases, not in the AlOx prepolish & polish phases. This leads me to suspect that the gas is CO2 so if you want to try an additive it must be capable of reacting CO2 gas into a solid water soluable compound to be effective. The only additive that may be effective against gassing would be a product like "Gas-X" that actually reacts CO2 gas into water and a soluable salt. |
|
?
