An IMaterialDefinition object represents a material definition in the game. A Material Definition is needed if you want to create a new block.

It might be required for you to import the package if you encounter any issues, so better be safe than sorry and add the import.
import mods.contenttweaker.BlockMaterial;

You can get such an object using the Block Material Bracket Handler:
<blockmaterial:wood>

ZenGetter	ZenMethod	Возвращаемый тип
ZenGetter blocksLight	ZenMethod blocksLight()	Возвращаемый тип bool
ZenGetter blocksMovement	ZenMethod blocksMovement()	Возвращаемый тип bool
ZenGetter canBurn	ZenMethod getCanBurn()	Возвращаемый тип bool
ZenGetter mobilityFlag	ZenMethod getMobilityFlag()	Возвращаемый тип PushReaction
ZenGetter liquid	ZenMethod isLiquid()	Возвращаемый тип bool
ZenGetter opaque	ZenMethod isOpaque()	Возвращаемый тип bool
ZenGetter replaceable	ZenMethod isReplaceable()	Возвращаемый тип bool
ZenGetter solid	ZenMethod isSolid()	Возвращаемый тип bool
ZenGetter toolNotRequired	ZenMethod isToolNotRequired()	Возвращаемый тип bool

You can use the == operator to see if two MaterialDefinitions are equal

ZenScript
 Copy
if(materialA == materialB)
    print("success!");