An IMaterial object represents the material a block is made of.

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 crafttweaker.block.IMaterial;

ZenGetter	ZenMethod	Return Type
ZenGetter blocksLight	ZenMethod blocksLight()	Return Type bool
ZenGetter blocksMovement	ZenMethod blocksMovement()	Return Type bool
ZenGetter canBurn	ZenMethod getCanBurn()	Return Type bool
ZenGetter mobilityFlag	ZenMethod getMobilityFlag()	Return Type string
ZenGetter liquid	ZenMethod isLiquid()	Return Type bool
ZenGetter opaque	ZenMethod isOpaque()	Return Type bool
ZenGetter replaceable	ZenMethod isReplaceable()	Return Type bool
ZenGetter solid	ZenMethod isSolid()	Return Type bool
ZenGetter toolNotRequired	ZenMethod isToolNotRequired()	Return Type bool
ZenGetter ​	ZenMethod setReplaceable()	Return Type IMaterial

Uses an IMaterial.
Returns a bool.

ZenScript
 Copy
materialObj.matches(IMaterial other);

You can use these methods to get the vanilla minecraft materials

ZenScript
 Copy
crafttweaker.blocks.IMaterial.air();
crafttweaker.blocks.IMaterial.anvil();
crafttweaker.blocks.IMaterial.barrier();
crafttweaker.blocks.IMaterial.cactus();
crafttweaker.blocks.IMaterial.cake();
crafttweaker.blocks.IMaterial.carpet();
crafttweaker.blocks.IMaterial.circuits();
crafttweaker.blocks.IMaterial.clay();
crafttweaker.blocks.IMaterial.cloth();
crafttweaker.blocks.IMaterial.coral();
crafttweaker.blocks.IMaterial.craftedSnow();
crafttweaker.blocks.IMaterial.dragonEgg();
crafttweaker.blocks.IMaterial.fire();
crafttweaker.blocks.IMaterial.glass();
crafttweaker.blocks.IMaterial.gourd();
crafttweaker.blocks.IMaterial.grass();
crafttweaker.blocks.IMaterial.ground();
crafttweaker.blocks.IMaterial.ice();
crafttweaker.blocks.IMaterial.iron();
crafttweaker.blocks.IMaterial.lava();
crafttweaker.blocks.IMaterial.leaves();
crafttweaker.blocks.IMaterial.packedIce();
crafttweaker.blocks.IMaterial.piston();
crafttweaker.blocks.IMaterial.plants();
crafttweaker.blocks.IMaterial.portal();
crafttweaker.blocks.IMaterial.redstoneLight();
crafttweaker.blocks.IMaterial.rock();
crafttweaker.blocks.IMaterial.sand();
crafttweaker.blocks.IMaterial.snow();
crafttweaker.blocks.IMaterial.sponge();
crafttweaker.blocks.IMaterial.structureVoid();
crafttweaker.blocks.IMaterial.tnt();
crafttweaker.blocks.IMaterial.vine();
crafttweaker.blocks.IMaterial.water();
crafttweaker.blocks.IMaterial.web();
crafttweaker.blocks.IMaterial.wood();