Tungsten Carbide Tipped (TCT) saw chains are specifically developed for longer cutting edge life, resulting in less frequent sharpening. TCT chain cuts approximately 4-5 times more wood per sharpen than conventional steel chain. Cutting tooth is designed for faster cutting of both dry and green wood. It's also suited to cutting dirty or treated wood, burnt logs, stumping etc, but contacting hard objects like sand, rocks or steel will damage it.
Tungsten carbide is an extremely hard brittle compound, approximately twice the density of steel. It can only be sharpened with discs or files coated with diamond.