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