Physics Builder Tools > User Inputs > External Material List

External Material List
In the Model Builder most material properties get their values from the material assigned to the geometric entities overlapping with the selection of the feature instance. As an option, add a External Material List node ().
This node lists all external materials that satisfy the list of the input and output variables to the external socket. The list of socket inputs and socket outputs must be defined as subnodes of this node (see Socket Input and Socket Output)
To add an External Material List first add a feature node, for example, a Generic Feature, Domain Condition, or Device Model Feature, then:
From the contextual toolbar (in this example, Generic Feature, Domain Condition, or Device Model Feature), click the External Material List () button.
Right-click the feature node (in this example, Generic Feature, Domain Condition, or Device Model Feature) and select it from the Inputs submenu.
External Material List
Specify the name of the external material list in the Name field, and the description in the Description field.
Advanced
By default, the integration order is determined automatically. To set an integration order manually, select Customized instead of Automatic from the Integration order list and then add an order as a positive integer in the Order field (default: 2).
GUI Options
If you want the material list to disappear when it is inactive, select the Hide user input in GUI when inactive check box. Select the Show no description check box to hide the text label containing the description above the GUI component of the material list. Similarly, you can hide the symbol from the GUI by selecting the Show no symbol check box. As a final option, it is possible to add a divider above the GUI component and any description text label. The divider is a horizontal line with an optional descriptive text. Select the Add divider above the material list check box to add the divider. When selected, you can enter the divider text in the Text field.
Materials in the COMSOL Multiphysics Reference Manual