The Blade of a Lightsaber Can Cut Through Virtually Anything, Except for Another Lightsaber and Some Substances That Appear in the Expanded Universe Stories...
The blade of a lightsaber can cut through virtually anything, except for another lightsaber and some substances that appear in the Expanded Universe stories. Also, they'd probably be really useful when making a grilled-cheese sandwich.
What material can a lightsaber not cut through?
Beskar. The most well-known example of a lightsaber-resistant material, beskar is inexorably tied to Mandalorian culture.
One, in the Marvel universe, the other in the Star Wars universe. Per Hamill's explanation, the lightsaber would be able to cut through Captain America's vibranium shield, and probably with ease.
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