Aluminium Treatment — Degassing Tablets
Degassing Tablets
Degassing tablets for aluminium are pre-measured compact tablets plunged to the furnace floor using a steel rod, releasing gas consistently through the full bath depth as they dissolve — providing controlled, metered degassing of the aluminium melt to remove dissolved hydrogen and minimise gas porosity in the casting.
Unlike powder degassing flux spread on the surface, tablets release their gas at the furnace floor, generating bubbles that scavenge hydrogen throughout the entire bath depth as they rise — a more thorough degassing profile for the same bath volume. Pre-measured tablet dosing removes the variability of manual powder weighing and ensures every melt receives a consistent treatment. EGYHEX AL tablets are particularly suited to crucible furnaces, small induction melters, and ladles where plunging to bath depth is straightforward and operator proximity to the melt surface makes low surface fume preferable. CFC Egypt manufactures EGYHEX AL at our Sadat City plant to serve the aluminium casting industry across the MENA region.
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Where Degassing Tablets Are Used
Degassing tablets are preferred over powder in smaller furnace operations, crucible melting, and applications where precise dosing and lower surface fume are important.
Crucible Furnaces & Small Induction Melters
In crucible furnaces and small induction melters — the workhorse of jobbing foundries, prototype casters, and small die casting operations — the operator stands close to the furnace opening during treatment. Powder degassing spread on the surface generates visible fume at the melt surface in the operator's work zone. Tablets plunged to the crucible floor produce gas from depth; surface fume is significantly reduced because the gas has partially reacted and the hydrogen has transferred to the bubble before it reaches the surface.
Precision Casting — Consistent Per-Heat Dosing
Aerospace investment casting, precision sand casting, and other quality-critical aluminium casting processes require consistent degassing treatment across every heat. Tablets provide this consistency by eliminating the dosing variability that occurs when operators manually weigh powder — a single tablet per specified furnace size gives the same gas output every time. Process control records for quality-certified operations can reference tablet count per heat rather than powder weight, simplifying documentation and reducing operator-to-operator variation.
Ladle Degassing Before Pouring
When aluminium is transferred from the melting furnace to a pouring ladle, it is exposed to the atmosphere and absorbs additional hydrogen from the transfer turbulence and the ladle atmosphere. A degassing tablet plunged into the ladle immediately before pouring provides a final hydrogen reduction treatment at the point of use — particularly valuable in gravity and tilt-pour casting operations where the metal sits in the ladle for several minutes between taps before each pour. The compact tablet is more practical than powder in the ladle environment.