Backing mixes explained: matching the packing to the crucible
By the Magna technical team · August 2026 · 1 min read
The backing mix is the refractory that packs the crucible into the furnace. Its job is to support the crucible evenly and to expand and contract at a similar rate as the furnace heats and cools.
Match the packing to the crucible and it stays fully supported through every cycle, which means longer crucible life and fewer surprises. A mismatch leaves the wall unsupported and shortens the life of an otherwise sound crucible.
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