<?xml version="1.0"?>
<PropertySetDef xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" ifdguid="55841780d1ed11e1800000215ad4efdf" templatetype="PSET_TYPEDRIVENOVERRIDE" xsi:noNamespaceSchemaLocation="http://buildingSMART-tech.org/xml/psd/PSD_IFC4.xsd">
  <IfcVersion version="IFC4" />
  <Name>Pset_MaterialHygroscopic</Name>
  <Definition>A set of hygroscopic properties of materials.</Definition>
  <Applicability />
  <ApplicableClasses>
    <ClassName>IfcMaterial</ClassName>
  </ApplicableClasses>
  <ApplicableTypeValue>IfcMaterial</ApplicableTypeValue>
  <PropertyDefs>
    <PropertyDef ifdguid="59179e80d1ed11e1800000215ad4efdf">
      <Name>UpperVaporResistanceFactor</Name>
      <Definition>The vapor permeability relationship of air/material (typically value &gt; 1), measured in high relative humidity (typically in 95/50 % RH).</Definition>
      <PropertyType>
        <TypePropertySingleValue>
          <DataType type="IfcPositiveRatioMeasure" />
        </TypePropertySingleValue>
      </PropertyType>
      <NameAliases>
        <NameAlias lang="en">Upper Vapor Resistance Factor</NameAlias>
      </NameAliases>
      <DefinitionAliases>
        <DefinitionAlias lang="en" />
      </DefinitionAliases>
    </PropertyDef>
    <PropertyDef ifdguid="5ddc5280d1ed11e1800000215ad4efdf">
      <Name>LowerVaporResistanceFactor</Name>
      <Definition>The vapor permeability relationship of air/material (typically value &gt; 1), measured in low relative humidity (typically in 0/50 % RH).</Definition>
      <PropertyType>
        <TypePropertySingleValue>
          <DataType type="IfcPositiveRatioMeasure" />
        </TypePropertySingleValue>
      </PropertyType>
      <NameAliases>
        <NameAlias lang="en">Lower Vapor Resistance Factor</NameAlias>
      </NameAliases>
      <DefinitionAliases>
        <DefinitionAlias lang="en" />
      </DefinitionAliases>
    </PropertyDef>
    <PropertyDef ifdguid="63399d00d1ed11e1800000215ad4efdf">
      <Name>IsothermalMoistureCapacity</Name>
      <Definition>Based on water vapor density.</Definition>
      <PropertyType>
        <TypePropertySingleValue>
          <DataType type="IfcIsothermalMoistureCapacityMeasure" />
        </TypePropertySingleValue>
      </PropertyType>
      <NameAliases>
        <NameAlias lang="en">Isothermal Moisture Capacity</NameAlias>
      </NameAliases>
      <DefinitionAliases>
        <DefinitionAlias lang="en" />
      </DefinitionAliases>
    </PropertyDef>
    <PropertyDef ifdguid="67fe5100d1ed11e1800000215ad4efdf">
      <Name>VaporPermeability</Name>
      <Definition>The rate of water vapor transmission per unit area per unit of vapor pressure differential under test conditions.</Definition>
      <PropertyType>
        <TypePropertySingleValue>
          <DataType type="IfcVaporPermeabilityMeasure" />
        </TypePropertySingleValue>
      </PropertyType>
      <NameAliases>
        <NameAlias lang="en">Vapor Permeability</NameAlias>
      </NameAliases>
      <DefinitionAliases>
        <DefinitionAlias lang="en" />
      </DefinitionAliases>
    </PropertyDef>
    <PropertyDef ifdguid="6c2a6e80d1ed11e1800000215ad4efdf">
      <Name>MoistureDiffusivity</Name>
      <Definition>Moisture diffusivity is a transport property that is frequently used in the hygrothermal analysis of building envelope components.</Definition>
      <PropertyType>
        <TypePropertySingleValue>
          <DataType type="IfcMoistureDiffusivityMeasure" />
        </TypePropertySingleValue>
      </PropertyType>
      <NameAliases>
        <NameAlias lang="en">Moisture Diffusivity</NameAlias>
      </NameAliases>
      <DefinitionAliases>
        <DefinitionAlias lang="en" />
      </DefinitionAliases>
    </PropertyDef>
  </PropertyDefs>
  <PsetDefinitionAliases>
    <PsetDefinitionAlias lang="en" />
  </PsetDefinitionAliases>
</PropertySetDef>