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Old 03-17-2005, 12:35 PM
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kaleidoglass kaleidoglass is offline
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soft glass melting temperature

Hi, I'm curious as to what the approx. melting temperature is for soft glass vs. hard glass.
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Old 03-17-2005, 01:03 PM
wsimpso1 wsimpso1 is offline
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Re: soft glass melting temperature

Hi, I don't have information on specific glasses, but the numbers given for the melting point of glasses in general are 600-800 degrees C for soft glass, and 750-1100 degrees C for hard glass (pyrex etc.). As you can see the ranges are pretty broad. Bill
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Old 03-17-2005, 02:13 PM
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Re: soft glass melting temperature

Wow, I guess I was way off.

the numbers you gave me are in celsius, and when I convert them to fahrenheit the temps are 1100-1500 F for soft glass and 1400-2000 F for hard glass.

I don't know what made me think that soft glass melted at 1700-1900 F.
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Old 03-17-2005, 07:21 PM
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Re: soft glass melting temperature

Hard glass tends to be 15- 20% higher for everything.
Fusers think about these temperatures all the time.
These temps are for Bullseye 90 coe glass. System 96 would be a little lower and Effretre would be lower still, but not by much.
The temps vary by specific color base or composition.

Strain Point - 825-900 (F)
Annealing - 875-975
Softening - 1175-1250
Kiln Polish-1350-1450
Full Fuse - 1550-1600
Casting - 1600
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Old 03-17-2005, 09:32 PM
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Re: soft glass melting temperature

Just out of curiosity, what applications did you want this info for, or was it just a curiosity question? By the way, glass "melts" at any temp if you give it enough time.
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Old 03-18-2005, 07:44 AM
PamDugger PamDugger is offline
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Re: soft glass melting temperature

I think the problem with the answers is, what do you mean by melting point. It seems to me that Corning was selling a hat that had 2300 on it, and when I asked what that was for, they answered that was the melting point for furnace glass, which is soft glass. So, soft glass becomes liquid at about 2300, I guess, while it softens at around 1200. I have always heard around 17 to 1900 on the torch for melting temp, but again it has to do with definition.
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Old 03-21-2005, 09:45 AM
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Re: soft glass melting temperature

Sorry about that guys, I can see where I needed to be more specific. I'm curious about what temperature range moretti vs. boro melt using a minor torch for making beads and small sculptural work.
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Old 03-21-2005, 12:49 PM
PamDugger PamDugger is offline
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Re: soft glass melting temperature

Okay, Nancy, after doing some research, I found these answers: Boro begins to melt at 2876 and soda lime glass begins to melt at 1283. I don't think what torch you are using matters. To achieve liquid form the temps would be higher.
Pam
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Old 03-21-2005, 01:11 PM
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Re: soft glass melting temperature

Hi Nancy....below are some figures I found years ago during some research.

Bullseye coe 90, working temp 1750, softening 1250, strain 820, anneal 940
Effetre coe 104, working 1700, softening 1200, strain 840, anneal 920-968

hope these help.
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Old 03-21-2005, 10:11 PM
luke gardner luke gardner is offline
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Re: soft glass melting temperature

Your minor should do the job just fine. I worked boro on a minor for about a year and it did the job well as long as you don't get carried away on the size. I would suggest trying clear experiments at first to get over the learning curve because the color is much more expensive.
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Old 01-23-2011, 11:11 AM
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Re: soft glass melting temperature

I'm wondering about using some type of metal to make a unique shape on a mandrel.
Here's an interesting find, about melting points.

Take a look at this and tell me which metal other than stainless steel do you think a custom mandrel could be made of, by someone that doesn't have access to some fantastic machinery but could weld something together considering the melting point of SOFT glass.

Copper 1981
Aluminum 1218
Stainless Steel 2550
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Old 01-23-2011, 11:11 PM
Kurthj Kurthj is offline
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Re: soft glass melting temperature

Isn't stainless used mostly for it's low heat conduction? I know you would have to drop a copper or alum mandrel before you got to the melting point of the glass. I have used 3/8 in. titanium rods to mix custom color in the torch. The lower weight compared to stainless really gives my wrists a break! It would make some great mandrels (lighter, stronger), but a tad bit pricey

Kurt
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