These discs are perfect for bench-mounted sanders or other tools with a 20 inch PSA plate.
They are constructed on heavyweight cloth backing, with a strong PSA (pressure sensitive adhesive - stronger than Stikit™) that will stand up to the high temperatures encountered in heavy coarse grit sanding.
These discs are available with both premium (777) and economy (348) series abrasives:
These are the 777F premium discs which have a Cubitron and aluminum oxide blended abrasive for superior, consistent cutting with higher durability and longer life than standard aluminum oxide discs.
Use them on stainless steel, nickel alloys, titanium, and some carbon steel applications.
These 777F discs perform dramatically better than the 348D economy discs.
• Constructed on a rigid, heavy F-weight polyester cloth backing
• Grinding aid for less loading and cooler runniing
• Resin bonded for additional heat resistance
Heavy on the technical side...
A little more about Cubitron:
Cubitron particles are somewhat less sharp than aluminum oxide, but they are harder and wear down more slowly.
The 777 Series blend of both minerals results in a disc that provides faster cutting and extended life compared to a traditional premium aluminum oxide disc.
The Cubitron also provides a more consistent scratch pattern throughout the life of the disc.
It is especially suitable for high heat applications such as working on tough metal substrates - like stainless steel or cold rolled steel.