4.1.2.6.4 Material Set
复合材料或多种材料可以使用材料集进行描述。有三种类型的材料集可供选择：
- 层集 - 具有填充边界厚度的分层材料
- 剖面集 - 当材料沿剖面形状挤出时
- 构成集 - 当材料均匀混合或任意放置时
材料通过 IfcMaterialLayerSet、IfcMaterialProfileSet 或 IfcMaterialConstituentSet 定义，并通过 IfcRelAssociatesMaterial .RelatingMaterial 进行关联。与使用的材料无关，集中的每个层、剖面或构成都可以使用名称和类别进行标识。
下图展示了应用此概念时使用的通用类和关系。 此外，概念可能对常见或标准化的行业实践和场景具有特殊意义。对于这些特定的使用场景，下表展示了用户可采用的推荐通用使用模式列表。
General Usage
| ApplicableEntity | Name IfcMaterialLayer.Name | Name IfcMaterialProfile.Name | Name IfcMaterialConstituent.Name |
|---|---|---|---|
| IfcActuator | Casing | Casing | Casing |
| IfcAirTerminal | Casing | Casing | Casing |
| IfcAirTerminalBox | Casing | Casing | Casing |
| IfcAirToAirHeatRecovery | Casing | Casing | Casing |
| IfcAirToAirHeatRecovery | Media | Media | Media |
| IfcAlarm | Casing | Casing | Casing |
| IfcAudioVisualAppliance | Casing | Casing | Casing |
| IfcBeam | LoadBearing | LoadBearing | LoadBearing |
| IfcBoiler | Casing | Casing | Casing |
| IfcBurner | Casing | Casing | Casing |
| IfcBurner | Fuel | Fuel | Fuel |
| IfcCableCarrierFitting | Casing | Casing | Casing |
| IfcCableCarrierSegment | Casing | Casing | Casing |
| IfcCableFitting | Casing | Casing | Casing |
| IfcCableFitting | Conductor | Conductor | Conductor |
| IfcCableSegment | Conductor | Conductor | Conductor |
| IfcCableSegment | Insulation | Insulation | Insulation |
| IfcCableSegment | Screen | Screen | Screen |
| IfcCableSegment | Sheath | Sheath | Sheath |
| IfcChiller | Casing | Casing | Casing |
| IfcChiller | Refrigerant | Refrigerant | Refrigerant |
| IfcCoil | Casing | Casing | Casing |
| IfcColumn | LoadBearing | LoadBearing | LoadBearing |
| IfcCommunicationsAppliance | Casing | Casing | Casing |
| IfcCompressor | Casing | Casing | Casing |
| IfcCompressor | Refrigerant | Refrigerant | Refrigerant |
| IfcCondenser | Casing | Casing | Casing |
| IfcCondenser | Refrigerant | Refrigerant | Refrigerant |
| IfcController | Casing | Casing | Casing |
| IfcCooledBeam | Casing | Casing | Casing |
| IfcCoolingTower | Casing | Casing | Casing |
| IfcCoolingTower | Fill | Fill | Fill |
| IfcCovering | Back | Back | Back |
| IfcCovering | Fill | Fill | Fill |
| IfcCovering | Finish | Finish | Finish |
| IfcCovering | Front | Front | Front |
| IfcCovering | Lining | Lining | Lining |
| IfcCovering | Trim | Trim | Trim |
| IfcDamper | Blade | Blade | Blade |
| IfcDamper | Frame | Frame | Frame |
| IfcDamper | Seal | Seal | Seal |
| IfcDistributionChamberElement | Base | Base | Base |
| IfcDistributionChamberElement | Cover | Cover | Cover |
| IfcDistributionChamberElement | Fill | Fill | Fill |
| IfcDistributionChamberElement | Wall | Wall | Wall |
| IfcDoor | Framing | Framing | Framing |
| IfcDoor | Glazing | Glazing | Glazing |
| IfcDoor | Lining | Lining | Lining |
| IfcDuctFitting | Casing | Casing | Casing |
| IfcDuctFitting | Coating | Coating | Coating |
| IfcDuctFitting | Insulation | Insulation | Insulation |
| IfcDuctFitting | Lining | Lining | Lining |
| IfcDuctSegment | Casing | Casing | Casing |
| IfcDuctSegment | Coating | Coating | Coating |
| IfcDuctSegment | Insulation | Insulation | Insulation |
| IfcDuctSegment | Lining | Lining | Lining |
| IfcDuctSilencer | Casing | Casing | Casing |
| IfcElectricAppliance | Casing | Casing | Casing |
| IfcElectricDistributionBoard | Casing | Casing | Casing |
| IfcElectricFlowStorageDevice | Casing | Casing | Casing |
| IfcElectricGenerator | Casing | Casing | Casing |
| IfcElectricMotor | Casing | Casing | Casing |
| IfcElectricTimeControl | Casing | Casing | Casing |
| IfcEngine | Casing | Casing | Casing |
| IfcEvaporativeCooler | Casing | Casing | Casing |
| IfcEvaporativeCooler | Media | Media | Media |
| IfcEvaporator | Casing | Casing | Casing |
| IfcEvaporator | Refrigerant | Refrigerant | Refrigerant |
| IfcFan | Casing | Casing | Casing |
| IfcFan | Wheel | Wheel | Wheel |
| IfcFilter | Casing | Casing | Casing |
| IfcFilter | Media | Media | Media |
| IfcFireSuppressionTerminal | Casing | Casing | Casing |
| IfcFireSuppressionTerminal | Damping | Damping | Damping |
| IfcFlowInstrument | Casing | Casing | Casing |
| IfcFlowMeter | Casing | Casing | Casing |
| IfcFurniture | Finish | Finish | Finish |
| IfcFurniture | Frame | Frame | Frame |
| IfcFurniture | Hardware | Hardware | Hardware |
| IfcFurniture | Padding | Padding | Padding |
| IfcFurniture | Panel | Panel | Panel |
| IfcHeatExchanger | Casing | Casing | Casing |
| IfcHumidifier | Casing | Casing | Casing |
| IfcInterceptor | Casing | Casing | Casing |
| IfcInterceptor | Cover | Cover | Cover |
| IfcInterceptor | Strainer | Strainer | Strainer |
| IfcJunctionBox | Casing | Casing | Casing |
| IfcLamp | Bulb | Bulb | Bulb |
| IfcLamp | Conductor | Conductor | Conductor |
| IfcLamp | Filament | Filament | Filament |
| IfcLightFixture | Casing | Casing | Casing |
| IfcMedicalDevice | Casing | Casing | Casing |
| IfcMember | LoadBearing | LoadBearing | LoadBearing |
| IfcMotorConnection | Casing | Casing | Casing |
| IfcOutlet | Casing | Casing | Casing |
| IfcOutlet | Conductor | Conductor | Conductor |
| IfcOutlet | Surface | Surface | Surface |
| IfcPipeFitting | Casing | Casing | Casing |
| IfcPipeFitting | Coating | Coating | Coating |
| IfcPipeFitting | Insulation | Insulation | Insulation |
| IfcPipeFitting | Lining | Lining | Lining |
| IfcPipeSegment | Casing | Casing | Casing |
| IfcPipeSegment | Coating | Coating | Coating |
| IfcPipeSegment | Insulation | Insulation | Insulation |
| IfcPipeSegment | Lining | Lining | Lining |
| IfcPlate | LoadBearing | LoadBearing | LoadBearing |
| IfcProtectiveDevice | Casing | Casing | Casing |
| IfcPump | Casing | Casing | Casing |
| IfcPump | Impeller | Impeller | Impeller |
| IfcPump | Seal | Seal | Seal |
| IfcReinforcingBar | Coating | Coating | Coating |
| IfcReinforcingBar | Core | Core | Core |
| IfcSanitaryTerminal | Casing | Casing | Casing |
| IfcSensor | Casing | Casing | Casing |
| IfcSlab | Insulation | Insulation | Insulation |
| IfcSlab | LoadBearing | LoadBearing | LoadBearing |
| IfcSolarDevice | Casing | Casing | Casing |
| IfcSpaceHeater | Casing | Casing | Casing |
| IfcStackTerminal | Casing | Casing | Casing |
| IfcSwitchingDevice | Casing | Casing | Casing |
| IfcSwitchingDevice | Conductor | Conductor | Conductor |
| IfcSwitchingDevice | Surface | Surface | Surface |
| IfcSystemFurnitureElement | Finish | Finish | Finish |
| IfcSystemFurnitureElement | Frame | Frame | Frame |
| IfcSystemFurnitureElement | Hardware | Hardware | Hardware |
| IfcSystemFurnitureElement | Padding | Padding | Padding |
| IfcSystemFurnitureElement | Panel | Panel | Panel |
| IfcTank | Casing | Casing | Casing |
| IfcTransformer | Casing | Casing | Casing |
| IfcTubeBundle | Casing | Casing | Casing |
| IfcUnitaryControlElement | Casing | Casing | Casing |
| IfcUnitaryEquipment | Casing | Casing | Casing |
| IfcValve | Casing | Casing | Casing |
| IfcValve | Operation | Operation | Operation |
| IfcVibrationIsolator | Casing | Casing | Casing |
| IfcVibrationIsolator | Damping | Damping | Damping |
| IfcWall | Insulation | Insulation | Insulation |
| IfcWall | LoadBearing | LoadBearing | LoadBearing |
| IfcWasteTerminal | Casing | Casing | Casing |
| IfcWasteTerminal | Cover | Cover | Cover |
| IfcWindow | Framing | Framing | Framing |
| IfcWindow | Glazing | Glazing | Glazing |
| IfcWindow | Lining | Lining | Lining |