8.10.3.1 IfcMaterial

8.10.3.1.1 Semantic definition

IfcMaterial is a homogeneous or inhomogeneous substance that can be used to form elements (physical products or their components).

IfcMaterial is the basic entity for material designation and definition; this includes identification by name and classification (via reference to an external classification), as well as association of material properties (isotropic or anisotropic) defined by (subtypes of) IfcMaterialProperties. An instance of IfcMaterial may be associated to an element or element type using the IfcRelAssociatesMaterial relationship. The assignment might either be direct as a single material information, or via

a material layer set
a material profile set
a material constituent set

An IfcMaterial may also have presentation information associated. Such presentation information is provided by IfcMaterialDefinitionRepresentation, associating curve styles, hatching definitions or surface colouring/rendering information to a material.

8.10.3.1.2 Entity inheritance

- IfcMaterialDefinition

8.10.3.1.3 Attributes

#	Attribute	Type	Description
IfcMaterialDefinition (3)
	AssociatedTo	SET [0:?] OF IfcRelAssociatesMaterial FOR RelatingMaterial	Use of the IfcMaterialDefinition subtypes within the material association of an element occurrence or element type. The association is established by the IfcRelAssociatesMaterial relationship. IFC4-CHANGE The inverse attribute has been added.
	HasExternalReferences	SET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects	Reference to external references, e.g. library, classification, or document information, that are associated to the material. IFC4-CHANGE The inverse attribute has been added.
	HasProperties	SET [0:?] OF IfcMaterialProperties FOR Material	Material properties assigned to instances of subtypes of IfcMaterialDefinition. IFC4-CHANGE The inverse attribute has been added.
Click to show 3 hidden inherited attributes Click to hide 3 inherited attributes
IfcMaterial (6)
1	Name	IfcLabel	Name of the material. EXAMPLE A view definition may require each Name attribute to be unique, e.g. for each concrete or steel grade used in a project, in which case the Category should take the values 'concrete' or 'steel'. NOTE Material grade may have different meaning in different view definitions, e.g. strength grade for structural design and analysis, or visible appearance grade in architectural application. Also, more elaborate material grade definition may be associated as classification via inverse attribute HasExternalReferences.
2	Description	OPTIONAL IfcText	Definition of the material in more descriptive terms than given by attributes Name or Category. IFC4-CHANGE The attribute has been added at the end of attribute list.
3	Category	OPTIONAL IfcLabel	Definition of the category (group or type) of material, in more general terms than given by attribute Name. It is recommended to use common terms for the material category, the following list constitutes such a recommondation: 'concrete', 'steel', 'aluminium', 'block', 'brick', 'stone', 'wood', 'glass', 'gypsum', 'plastic', 'earth'. IFC4-CHANGE The attribute has been added at the end of attribute list.
	HasRepresentation	SET [0:1] OF IfcMaterialDefinitionRepresentation FOR RepresentedMaterial	Reference to the IfcMaterialDefinitionRepresentation that provides presentation information to a representation common to this material in style definitions. IFC2x3-CHANGE The inverse attribute HasRepresentation has been added.
	IsRelatedWith	SET [0:?] OF IfcMaterialRelationship FOR RelatedMaterials	Reference to a material relationship indicating that this material is a part (or constituent) in a material composite. IFC4-CHANGE The inverse attribute has been added.
	RelatesTo	SET [0:1] OF IfcMaterialRelationship FOR RelatingMaterial	Reference to a material relationship indicating that this material composite has parts (or constituents). IFC4-CHANGE The inverse attribute has been added.

Table 8.10.3.1.A

8.10.3.1.4 Property sets

Pset_MaterialCombustion
- SpecificHeatCapacity
- N20Content
- COContent
- CO2Content
Pset_MaterialCommon
- MolecularWeight
- Porosity
- MassDensity
Pset_MaterialConcrete
- CompressiveStrength
- MaxAggregateSize
- AdmixturesDescription
- Workability
- WaterImpermeability
- ProtectivePoreRatio
Pset_MaterialEnergy
- ViscosityTemperatureDerivative
- MoistureCapacityThermalGradient
- ThermalConductivityTemperatureDerivative
- SpecificHeatTemperatureDerivative
- VisibleRefractionIndex
- SolarRefractionIndex
- GasPressure
Pset_MaterialFuel
- CombustionTemperature
- CarbonContent
- LowerHeatingValue
- HigherHeatingValue
Pset_MaterialHygroscopic
- UpperVaporResistanceFactor
- LowerVaporResistanceFactor
- IsothermalMoistureCapacity
- VaporPermeability
- MoistureDiffusivity
Pset_MaterialMechanical
- DynamicViscosity
- YoungModulus
- ShearModulus
- PoissonRatio
- ThermalExpansionCoefficient
Pset_MaterialOptical
- VisibleTransmittance
- SolarTransmittance
- ThermalIrTransmittance
- ThermalIrEmissivityBack
- ThermalIrEmissivityFront
- VisibleReflectanceBack
- VisibleReflectanceFront
- SolarReflectanceBack
- SolarReflectanceFront
Pset_MaterialSteel
- YieldStress
- UltimateStress
- UltimateStrain
- HardeningModule
- ProportionalStress
- PlasticStrain
- Relaxations
- StructuralGrade
Pset_MaterialThermal
- SpecificHeatCapacity
- BoilingPoint
- FreezingPoint
- ThermalConductivity
Pset_MaterialWater
- IsPotable
- Hardness
- AlkalinityConcentration
- AcidityConcentration
- ImpuritiesContent
- DissolvedSolidsContent
- PHLevel
Pset_MaterialWood
- Species
- StrengthGrade
- AppearanceGrade
- Layup
- Layers
- Plies
- MoistureContent
- DimensionalChangeCoefficient
- ThicknessSwelling
Pset_MaterialWoodBasedStructure
- ApplicableStructuralDesignMethod
Pset_MechanicalBeamInPlane
- YoungModulus
- YoungModulusMin
- YoungModulusPerp
- YoungModulusPerpMin
- ShearModulus
- ShearModulusMin
- BendingStrength
- TensileStrength
- TensileStrengthPerp
- CompStrength
- CompStrengthPerp
- RaisedCompStrengthPerp
- ShearStrength
- TorsionalStrength
- ReferenceDepth
- InstabilityFactors
Pset_MechanicalBeamInPlaneNegative
- YoungModulus
- YoungModulusMin
- YoungModulusPerp
- YoungModulusPerpMin
- ShearModulus
- ShearModulusMin
- BendingStrength
- TensileStrength
- TensileStrengthPerp
- CompStrength
- CompStrengthPerp
- RaisedCompStrengthPerp
- ShearStrength
- TorsionalStrength
- ReferenceDepth
- InstabilityFactors
Pset_MechanicalBeamOutOfPlane
- YoungModulus
- YoungModulusMin
- YoungModulusPerp
- YoungModulusPerpMin
- ShearModulus
- ShearModulusMin
- BendingStrength
- TensileStrength
- TensileStrengthPerp
- CompStrength
- CompStrengthPerp
- RaisedCompStrengthPerp
- ShearStrength
- TorsionalStrength
- ReferenceDepth
- InstabilityFactors
Pset_MechanicalPanelInPlane
- YoungModulusBending
- YoungModulusTension
- YoungModulusCompression
- ShearModulus
- BendingStrength
- CompressiveStrength
- TensileStrength
- ShearStrength
- BearingStrength
- RaisedCompressiveStrength
- ReferenceDepth
Pset_MechanicalPanelOutOfPlane
- YoungModulusBending
- YoungModulusTension
- YoungModulusCompression
- ShearModulus
- BendingStrength
- CompressiveStrength
- TensileStrength
- ShearStrength
- BearingStrength
- RaisedCompressiveStrength
- ReferenceDepth
Pset_MechanicalPanelOutOfPlaneNegative
- YoungModulusBending
- YoungModulusTension
- YoungModulusCompression
- ShearModulus
- BendingStrength
- CompressiveStrength
- TensileStrength
- ShearStrength
- BearingStrength
- RaisedCompressiveStrength
- ReferenceDepth

8.10.3.1.5 Concept usage

Concept	Usage	Description
IfcMaterial (1)
Property Sets for Materials	General	This concept can be applied to the following resources: Pset_MaterialCombustion Pset_MaterialCommon Pset_MaterialConcrete Pset_MaterialEnergy Pset_MaterialFuel Pset_MaterialHygroscopic Pset_MaterialMechanical Pset_MaterialOptical Pset_MaterialSteel Pset_MaterialThermal Pset_MaterialWater Pset_MaterialWood Pset_MaterialWoodBasedStructure Pset_MechanicalBeamInPlane Pset_MechanicalBeamInPlaneNegative Pset_MechanicalBeamOutOfPlane Pset_MechanicalPanelInPlane Pset_MechanicalPanelOutOfPlane Pset_MechanicalPanelOutOfPlaneNegative

Concept

Usage

Description

IfcMaterial (1)

Property Sets for Materials

General

This concept can be applied to the following resources:

Table 8.10.3.1.B

8.10.3.1.6 Formal representation

ENTITY IfcMaterial
 SUBTYPE OF (IfcMaterialDefinition);
	Name : IfcLabel;
	Description : OPTIONAL IfcText;
	Category : OPTIONAL IfcLabel;
 INVERSE
	HasRepresentation : SET [0:1] OF IfcMaterialDefinitionRepresentation FOR RepresentedMaterial;
	IsRelatedWith : SET [0:?] OF IfcMaterialRelationship FOR RelatedMaterials;
	RelatesTo : SET [0:1] OF IfcMaterialRelationship FOR RelatingMaterial;
END_ENTITY;