Type III Engineered Hardcoat
Type III anodizing is done under tightly controlled conditions where the temperature of the sulphuric anodizing solution is held near 32 F – or 0 C – with a very high electrical current applied to the product. The result is a durable and hard anodic coating typically in the range of 60-70 on Rockwell C-Scale.
Type III anodizing results in a natural colour change to the aluminum and will vary from light tan to black. It is dependent on a number of factors including the temperature, current, duration of anodizing, alloy, and thickness.
Type III Anodizing Tip
Do not be fooled by anodizers who claim they can produce Type III-like anodizing in their Type II tanks. Yes, the coating thickness will be similar but the properties of the coating will not. Type III anodizing takes special equipment and know-how. When you specify Type III engineered hardcoat to Altech we provide it to you using our dedicated Type III tank.
Best results with Type III are achieved with 5000, 6000 and 7000 series alloys. High copper alloys like the 2000 series are not desirable. Neither are castings.