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Crumbly fused results

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Crumbly fused results

Postby Froglegs » Fri Nov 30, 2018 8:04 am

A few weeks ago I fused 2 standard pieces of glass without any issues. I used a 9" X 9"clear for the base and topped with 4 squares of transparent. (2) 004217 adv green,& jade grit w/adv grn streamers, and (2) 001417 emerald green.

2 days ago I attempted the same fusing with the same program and types of glass. The result was, what looked like, a finely cracked piece. As I went to lift it from the kiln it started to literally crumble.
Program used: 350-1050 , hold one min
450-1500, hold 10 min
Full-900, hold one hour
130-750 , off
Any ideas as to what happened?
Thank you.
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Re: Crumbly fused results

Postby martykremer » Fri Nov 30, 2018 7:53 pm

First, it's AVENTURINE not adventurine.
Second, what does the one minute hold at 1050 give you?
Third- are you sure all the glass (the second time around) was Bullseye?
Fourth- Grit or frit? Also compatible with the other glasses?
What kind of shelf did you fire on? Kilnwash (which one?)? Fiberpaper (ditto)?

Sounds to me, given the info you've given, that it stuck to the shelf at 1500 (too high, by the way) and fractured on the way down.
Photos always help these remote diagnoses.
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Re: Crumbly fused results

Postby Froglegs » Sun Dec 02, 2018 7:43 am

Thank you for responding Marty. It would help if I had given you the correct program.
This is what I used:
350-1120 hold 20 min
100-1220 hold 15 min
375-1500 hold 10 min
Full-900 hold 60 min
135-750 off

Kiln was is Fireworks. Glass was set directly on treated kiln shelf, as the clear glass was in bottom.
All glass was cut from the same large piece of glass as the previous project that was successful.Picture attached. The piece broke from corner when I attempted to remove glass from kiln.

Thank you for your input.
Attachments
IMG_9202.jpg
Picture of results
IMG_9202.jpg (140.46 KiB) Viewed 2562 times
Froglegs
 
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Re: Crumbly fused results

Postby martykremer » Sun Dec 02, 2018 8:02 am

Still looks like kilnwash failure.
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Re: Crumbly fused results

Postby marykaynitchie » Mon Dec 10, 2018 11:03 am

Froglegs,

Can you tell us more about what kind of shelf primer/kilnwash you used, and how you applied it?
If it was Bullseye, did you apply at least five thin layers, similar to the process shown here?

I shouldn't even put up video links, because we are launching a new video website tomorrow! And all our links will need fixing. But in case you see this today: https://videos.bullseyeglass.com/videos ... n-shelves/

I am so sorry your piece stuck to the shelf. I hope you can get it off.

Mary Kay
Mary Kay Nitchie
Bullseye Glass Co.

Subscribe to Bullseye kiln-glass videos at
bit.ly/BullVideos
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Re: Crumbly fused results

Postby marykaynitchie » Mon Dec 10, 2018 11:08 am

I'm moving this thread to the technical category.

Mary Kay
Mary Kay Nitchie
Bullseye Glass Co.

Subscribe to Bullseye kiln-glass videos at
bit.ly/BullVideos
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