Optifine is a very potent grain refiner which allows reduction of addition rates to extremely low levels over a range of AA alloys. Since Optifine has a consistent high potency, and the grain refinement process can be closely monitored with the Opticast method, there is no risk for cracking of ingots and billets. Improvements in cast ingot quality can be expected due to consistent grain size, lower levels of borides, boride agglomerates and oxides introduced as a result of the substantial reduction in grain refiner addition as well as the uniform nature of the Optifine grain refiner microstructure.
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