# 8.10.3.3 IfcMaterialConstituent

## 8.10.3.3.1 Semantic definition

IfcMaterialConstituent is a single and identifiable part of an element which is constructed of a number of part (one or more) each having an individual material. The association of the material constituent to the part is provided by a keyword as value of the Name attribute. In order to identify and distinguish the part of the shape representation to which the material constituent applies the IfcProductDefinitionShape of the element has to include instances of IfcShapeAspect, using the same keyword for their Name attribute.

## 8.10.3.3.4 Formal representation

ENTITY IfcMaterialConstituent
SUBTYPE OF (IfcMaterialDefinition);
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
Material : IfcMaterial;
Fraction : OPTIONAL IfcNormalisedRatioMeasure;
Category : OPTIONAL IfcLabel;
INVERSE
ToMaterialConstituentSet : IfcMaterialConstituentSet FOR MaterialConstituents;
END_ENTITY;