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To
overcome this problem and to provide constant molten metal to the rim,
the risers are surrounded with a 1/2" thick exothermic sleeve.
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The sleeve
is a source of heat for the riser and keeps the riser molten
and feeding metal into the rim, as the rim solidifies.
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![](images/Risers3.jpg) |
Four Risers on the
Rim with
Exothermic Sleeves |
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