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  #27  
Old 07-14-2002, 11:56 AM
Jim Vormelker
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Gaffer in a [mini] Denver

In an effort to reduce dust, and because I am close enough that shipping doesn't kill me, I switched from SP87 to Gaffer (Phillips).

In my huge, 60# Denver, I work down about 60 - 65% between charges. Charge in 2 or 3, +/- 10# - 12# fills. Set to 2250 and leave it 24 hrs. Down to 2140 to work.

Clear, bubble free.
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The variable is the popcorn effect when the Gaffer goes in. The pellets pop and land on the sill. There they melt and create a seal to do the door.

I like the glass (I don't work fast enough yet for slow setting to be a problem.... to me it's a virtue) but may have to go back to SP87 to be able to open the door.
Jim V

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I have been melting SP87 for 3 years now in my Denver 135 # furnace.

When I charge, I usually let the furnace sit at whatever the working temp. was until I put the last of the batch in to fill the crucible. Then I ramp up to 2225 and let it cook for 10 hours, drop the temp. to 1900, let it squeeze for 2 hours then ramp up to 2050 where I work at.

I almost every time come out with beautiful clear, bubble free glass.

I am going to try Gaffer in the fall and see what happens.
Ed Kozlowski
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