10% Ferro Aluminum is a dilute master alloy with a nominal composition of 90% Al and 10% Fe, designed for the precise, controlled addition of iron to aluminum foundry melts. Solidus is approximately 1,211°F (655°C) and liquidus approximately 1,580°F (860°C), with a density of 0.103 lbs/in³ (2.85 g/cm³). The lower iron concentration compared to the 30% grade results in a significantly lower liquidus temperature, ensuring rapid dissolution and easier handling in smaller furnaces or lower-temperature operations. Solubility is excellent with rapid dissolution in aluminum at 1,300°F and above.
Iron additions to aluminum serve two primary functions in foundry applications: preventing die soldering in die casting operations by reducing the alloy’s tendency to bond to steel tooling, and improving high-temperature strength and hardness in specialized wrought alloys. The 10% grade is preferred when precise low-level iron additions are required without the risk of creating large insoluble sludge particles associated with higher-concentration additions at insufficient melt temperatures.
Supplied in 16–20 waffle form for consistent charge weight calculation and reliable recovery in production aluminum melting operations.
Available Forms
16-20 Waffle
Product Code
19013
Technical Info
Thermal Properties
Melting Point (Solidus)1,211°F (655°C)
Melting Point (Liquidus)1,565°F (852°C)
Physical Properties
Density (imperial)0.103 lbs/in³
Density (metric)2.85 g/cm³
Primary ElementsAl · Fe
Lead FreeYes
Key Features
Controlled Iron AdditionDie Soldering PreventionRapid DissolutionLow Liquidus
Solubility Note
Excellent and rapid dissolution in molten aluminum at 1,300°F and above.
Nominal Composition
90% Al
10% Fe
Frequently Asked Questions
Common technical inquiries regarding 10% Ferro Aluminum
The 10% grade is preferred for smaller furnace operations, lower-temperature melting, and applications requiring very precise low-level iron additions where the higher liquidus of the 30% grade would slow dissolution or risk incomplete recovery. It is also the safer choice when the target iron addition is small and the risk of localized iron-rich sludge formation — which occurs when the 30% grade is added to a melt that is too cool — must be avoided.
Iron additions reduce the solubility of the aluminum melt in steel by forming a thin intermetallic layer at the die surface that acts as a barrier between the molten aluminum and the tool steel. Without sufficient iron, aluminum alloys dissolve into the die steel surface over time, causing the casting to stick and requiring mechanical ejection that damages both the casting and the die. Most aluminum die casting alloys specify a minimum iron content of 0.7–1.3% specifically for this purpose.
If added below 1,300°F, the iron-aluminum intermetallic phases in the master alloy may not fully dissolve, settling as dense, insoluble sludge particles at the bottom of the furnace. This not only results in poor iron recovery and wasted material but also risks introducing hard sludge inclusions into the casting if the furnace is disturbed. Always ensure the melt is at or above the minimum recommended temperature and stir thoroughly after addition.
Al-Be master alloy (97.5% Al, 2.5% Be) for oxidation control and dross reduction in aluminum and magnesium casting melts. 4-5 oz pieces and 5 lb slabs.
Concentrated Al-Be master alloy (95% Al, 5% Be) for oxidation control in large-scale aluminum and magnesium casting. Higher potency than 2.5% grade. 4-5 oz pieces and 5 lb slabs.
Al-Si master alloy (50% Al, 50% Si) for precise silicon additions to improve fluidity and reduce shrinkage in aluminum casting alloys. Waffle and granular forms.
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