Just like most other abrasive products, there is a variety of different abrasive grain types that can be used for flap discs and each has their own purpose.
Zirconia is the most common grain used for flap discs.
It is a tough abrasive with a high cut rate that can grind strong metals like stainless steel and titanium. The grains are self-sharpening which significantly reduces downtime while working.
Ceramic flap discs are another strong abrasive that can grind metal surfaces from carbon steel to aerospace alloys.
Like zirconia, ceramic is a friable abrasive grain that continuously exposes new sharp grains, so you can keep working without a dulling disc. A key feature that sets ceramic flap discs apart from others is the low temperature buildup compared to other materials.
Aluminum Oxide is the best flap disc for aluminum and other soft metals.
When combined with a white calcium stearate coating, these discs prevent clogging (chip adhesion) which could damage the soft metal being worked on.
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