Rubber sprue base for lost wax casting, made in a tree-type design to fit standard and perforated casting flasks.
⭐ At a glance
📏 Available in 2", 3" or 4" sizes — choose the one that matches your flask
✅ Fits normal casting flasks and perforated flasks
Design: Tree-type sprue base
Use: Suitable for centrifugal casting and vacuum lost wax casting
📦 Sold as 1 per order (not a set of all three sizes)
🔧 What it does & how to use
A sprue base forms the foundation of a wax tree, giving the wax patterns a stable, sealed platform before the flask is filled with investment. It's used by jewellers and casters for both centrifugal and vacuum lost wax casting.
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Attach the sprue former: Fix the central sprue pin or former upright in the middle of the rubber base.
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Build the tree: Attach wax patterns to the sprue former to build up your casting tree.
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Fit the flask: Press the appropriate flask (normal or perforated) down over the base to form a sealed unit.
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Invest: Pour or vacuum-fill the flask with investment powder around the wax tree.
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Cast: Once set and burnt out, cast using your centrifugal or vacuum casting process as normal.
⚠️ Please check you select the correct size (2", 3" or 4") to match the diameter of your casting flask before ordering, as only one size is supplied per order.
