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Registered Member #62109
Joined: Sun Jan 28 2018, 10:00PM
Location: Porto Alegre
Posts: 56
I was trying to find around google if it is possible to melt the tip of a bottle to make it thinner with only a propane torch. But I just can't find anyone doing something like this. I just don't want to break the glass bottle trying because it is a nice bottle.
Registered Member #61569
Joined: Sat Apr 15 2017, 05:12PM
Location: Germany
Posts: 28
A propane torch is hot enough to melt glass in order to manipulate it. However it takes quite long. The only problem will be, that either by heating he tip or by cooling it down when it is finished the glass will break. You need an oven to cool it down very slowly and it would even better to heat it up uniformly in an oven.
Registered Member #19
Joined: Thu Feb 02 2006, 03:19PM
Location: Jacksonville, FL
Posts: 168
If the glass is borosilicate a propane torch is fine. In my experience, most bottles and glassware not intended for cooking are soda lime which need to be heated evenly; like Flachzange said with an oven. They also need to be cooled evenly and slowly. Borosilicate and fused quartz both tolerate large temperature differentials and do not (under most circumstances) shatter with uneven heating as soda lime will do.
Registered Member #62109
Joined: Sun Jan 28 2018, 10:00PM
Location: Porto Alegre
Posts: 56
Hmmmm that is a problem, I don't have any ovens here. But I got the idea, I could "pre heat" it to the max temperature I can, then use the torch. Maybe it works, I will try with another bottle. Thanks guys.
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
If you heat the bottle as much as possible with your torch, then when you've finished forming the glass you can put the whole thing in a box of dry vermicullite. That will allow it to cool very slowly, and is a reasonable alternative to using an annealing oven.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
No. I use vermiculite and my glassblowing still explodes... course I suck at glassblowing, so there is that factor.
If it is a nice bottle and you have never dealt with glass before, it will crack. You have to know what you're doing with glass to work with it successfully, it is an art and a science. Having the right tools only improves the probability of success, it doesn't guarantee it.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
MAPP gas would be hotter than propane, not sure if that helps. And maybe easier to control the locations of heat if you move it around. never done glass work though. When i did brazing of metals the difference between propane and MAPP pro was amazing.
Registered Member #62109
Joined: Sun Jan 28 2018, 10:00PM
Location: Porto Alegre
Posts: 56
Hmmm. I have never worked with glass also. It is a nice bottle, but I can find others on future. People just drink these whisky and let them in front of their homes for the "recycle truck". I think I will try something and then keep the torch a bit far or a heat blower on maximum, so I can cool it in a controlled way. Thanks.
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Molding glass
