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Removal of fiber paper

For discussion of processes related to using Bullseye glass, including kilnforming and kilncasting, torchwork, blowing and stained glass.

Removal of fiber paper

Postby k.russell.glass » Tue Jan 17, 2017 10:49 am

Did some "kiln-carving" with the rough side of the fiber paper against the glass surface and am having trouble fully removing the last remaining bits of fiber paper. Have tried scrubbing it with everything soft enough to not scratch it, have soaked it in acetone...
Last resort... sandblast it off?
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Re: Removal of fiber paper

Postby marykaynitchie » Wed Jan 18, 2017 9:30 am

Sandblasting might change the appearance somewhat, but will likely remove the fiber paper. What kind of glass did you use? What was the firing cycle?

We find that using an iridescent surface against the fiber paper releases very nicely. On the other hand, we use billets for kilncarving (with no iridescent surface) and those release nicely, too.

Mary Kay
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Re: Removal of fiber paper

Postby k.russell.glass » Thu Jan 19, 2017 8:29 am

I used 2 layers of opaque deep gray sheet glass, and would like to do the rest of the project in this same glass. Should I try applying kiln wash to the fiber paper?
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Re: Removal of fiber paper

Postby marykaynitchie » Thu Jan 19, 2017 11:21 am

Before we explore that idea, can you post your firing cycle and an image of the piece? I am wondering if the piece can be fired at a lower temperature, or with a shorter process temperature to reduce or eliminate the sticking.

Mary Kay
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Re: Removal of fiber paper

Postby k.russell.glass » Tue Jan 24, 2017 1:29 pm

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Re: Removal of fiber paper

Postby k.russell.glass » Tue Jan 24, 2017 1:34 pm

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Re: Removal of fiber paper

Postby k.russell.glass » Tue Jan 24, 2017 1:49 pm

gray.jpg
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Re: Removal of fiber paper

Postby marykaynitchie » Wed Jan 25, 2017 10:17 am

I would do two tests using a different cycle.

In this new cycle, lower the process temperature to 1450 or 1475°F.

1) Set up a 4 x 4" tile with two layers of the same gray glass, place it on a simple but similar shelf paper layered arrangement. See if the glass flowed enough and stuck less.

2) Set up a 4 x 4" tile with two layers of the same gray glass, place it on a simple but similar shelf paper layered arrangement--but this one is coated with shelf primer (allowed to dry).

Fire both in the same firing.

If tile #1 flowed enough and stuck less, you can use that cycle for your next piece.
Tile #2 is for comparison, to see if your idea about using shelf primer is a better solution.

Another completely different solution to test: pre-fire your two pieces of gray glass into a single tile in a separate firing. Then, because bubble trapping will no longer be a potential problem, adjust your kilncasting cycle by eliminating the soak at 1200°F.

Let us know if you try any of these!

Mary Kay
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Bullseye Glass Co.

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Re: Removal of fiber paper

Postby k.russell.glass » Wed Jan 25, 2017 8:10 pm

Will do, thank you very much!
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