The thermal expansion coefficient of the asset. 
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Since:  2013 
Syntax
Remarks
 This property cannot be used to set the thermal expansion coefficient for wood-based and isotropic materials. For such assets, use setThermalExpansionCoefficient instead. The value is in inverse Kelvin (1/K). 
Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.ExceptionsArgumentNullException | When setting this property: A non-optional argument was null | 
| Autodesk.Revit.ExceptionsInapplicableDataException | When setting this property: the material type is wood. -or- When setting this property: the behavior is isotropic. |