diff --git a/src/Mod/Material/Gui/BaseDelegate.cpp b/src/Mod/Material/Gui/BaseDelegate.cpp
index 3f75d52fb8..2052291dcf 100644
--- a/src/Mod/Material/Gui/BaseDelegate.cpp
+++ b/src/Mod/Material/Gui/BaseDelegate.cpp
@@ -106,8 +106,13 @@ void BaseDelegate::paintQuantity(QPainter* painter,
     else {
         QVariant item = getValue(index);
         auto quantity = item.value<Base::Quantity>();
-        QString text = quantity.getUserString();
-        painter->drawText(option.rect, 0, text);
+        if (quantity.isValid()) {
+            QString text = quantity.getUserString();
+            painter->drawText(option.rect, 0, text);
+        }
+        else {
+            painter->drawText(option.rect, 0, QString());
+        }
     }
 
     painter->restore();
@@ -350,8 +355,10 @@ void BaseDelegate::setModelData(QWidget* editor,
     }
     else if (type == Materials::MaterialValue::Quantity) {
         auto input = dynamic_cast<Gui::InputField*>(editor);
-        value = input->text();
-        return;
+        // value = input->text();
+        // return;
+        auto quantity = Base::Quantity::parse(input->text());
+        value = QVariant::fromValue(quantity);
     }
     else if (type == Materials::MaterialValue::Integer) {
         auto spinner = dynamic_cast<Gui::IntSpinBox*>(editor);
diff --git a/src/Mod/Material/Gui/MaterialDelegate.cpp b/src/Mod/Material/Gui/MaterialDelegate.cpp
index feff9ec196..c095933fb9 100644
--- a/src/Mod/Material/Gui/MaterialDelegate.cpp
+++ b/src/Mod/Material/Gui/MaterialDelegate.cpp
@@ -133,8 +133,10 @@ void MaterialDelegate::setValue(QAbstractItemModel* model,
         auto material = group->child(row, 1)->data().value<std::shared_ptr<Materials::Material>>();
         // auto propertyName = group->child(row, 0)->text();
         auto propertyName = group->child(row, 0)->data().toString();
-        material->getProperty(propertyName)->setValue(value);
-        group->child(row, 1)->setText(value.toString());
+        std::string _name = propertyName.toStdString();
+        auto property = material->getProperty(propertyName);
+        property->setValue(value);
+        group->child(row, 1)->setText(property->getString());
     }
 
     notifyChanged(model, index);
@@ -267,7 +269,7 @@ void MaterialDelegate::showImageModal(const QString& propertyName, QStandardItem
 
     dlg->adjustSize();
 
-    //connect(dlg, &QDialog::finished, this, [&](int result) {});
+    // connect(dlg, &QDialog::finished, this, [&](int result) {});
 
     dlg->exec();
 }
@@ -281,7 +283,7 @@ void MaterialDelegate::showListModal(const QString& propertyName, QStandardItem*
 
     dlg->adjustSize();
 
-    //connect(dlg, &QDialog::finished, this, [&](int result) {});
+    // connect(dlg, &QDialog::finished, this, [&](int result) {});
 
     dlg->exec();
 }
@@ -295,7 +297,7 @@ void MaterialDelegate::showMultiLineStringModal(const QString& propertyName, QSt
 
     dlg->adjustSize();
 
-    //connect(dlg, &QDialog::finished, this, [&](int result) {});
+    // connect(dlg, &QDialog::finished, this, [&](int result) {});
 
     dlg->exec();
 }
@@ -310,7 +312,7 @@ void MaterialDelegate::showArray2DModal(const QString& propertyName, QStandardIt
 
     dlg->adjustSize();
 
-    //connect(dlg, &QDialog::finished, this, [&](int result) {});
+    // connect(dlg, &QDialog::finished, this, [&](int result) {});
 
     dlg->exec();
 }
@@ -324,7 +326,7 @@ void MaterialDelegate::showArray3DModal(const QString& propertyName, QStandardIt
 
     dlg->adjustSize();
 
-    //connect(dlg, &QDialog::finished, this, [&](int result) {});
+    // connect(dlg, &QDialog::finished, this, [&](int result) {});
 
     dlg->exec();
 }
diff --git a/src/Mod/Material/Resources/Models/Thermal/Thermal.yml b/src/Mod/Material/Resources/Models/Thermal/Thermal.yml
index 5bbf0a137e..6a102919c6 100644
--- a/src/Mod/Material/Resources/Models/Thermal/Thermal.yml
+++ b/src/Mod/Material/Resources/Models/Thermal/Thermal.yml
@@ -48,3 +48,11 @@ Model:
     Description: >
       Thermal expansion coefficient (linear) in [FreeCAD
       ThermalExpansionCoefficient unit]
+  ThermalExpansionReferenceTemperature:
+    DisplayName: "Thermal Expansion Reference Temperature"
+    Type: 'Quantity'
+    Units: 'K'
+    URL: ''
+    Description: >
+      The reference temperature is the temperature at which zero thermal
+      strains exist for the analysis.
diff --git a/src/Mod/Material/materialtests/TestMaterials.py b/src/Mod/Material/materialtests/TestMaterials.py
index 86f3104584..7bf7ba3925 100644
--- a/src/Mod/Material/materialtests/TestMaterials.py
+++ b/src/Mod/Material/materialtests/TestMaterials.py
@@ -67,7 +67,7 @@ class MaterialTestCases(unittest.TestCase):
 
         self.assertTrue(steel.isPhysicalModelComplete(self.uuids.Density))
         self.assertFalse(steel.isPhysicalModelComplete(self.uuids.IsotropicLinearElastic))
-        self.assertTrue(steel.isPhysicalModelComplete(self.uuids.Thermal))
+        self.assertFalse(steel.isPhysicalModelComplete(self.uuids.Thermal))
         self.assertFalse(steel.isPhysicalModelComplete(self.uuids.LinearElastic))
         self.assertTrue(steel.isAppearanceModelComplete(self.uuids.BasicRendering))
 
diff --git a/tests/src/Mod/Material/App/TestMaterials.cpp b/tests/src/Mod/Material/App/TestMaterials.cpp
index b0c5080569..024023d4ea 100644
--- a/tests/src/Mod/Material/App/TestMaterials.cpp
+++ b/tests/src/Mod/Material/App/TestMaterials.cpp
@@ -239,7 +239,7 @@ TEST_F(TestMaterial, TestCalculiXSteel)
 
     EXPECT_TRUE(steel->isPhysicalModelComplete(Materials::ModelUUIDs::ModelUUID_Mechanical_Density)); // Density
     EXPECT_FALSE(steel->isPhysicalModelComplete(Materials::ModelUUIDs::ModelUUID_Mechanical_IsotropicLinearElastic)); // IsotropicLinearElastic - incomplete
-    EXPECT_TRUE(steel->isPhysicalModelComplete(Materials::ModelUUIDs::ModelUUID_Thermal_Default)); // Thermal
+    EXPECT_FALSE(steel->isPhysicalModelComplete(Materials::ModelUUIDs::ModelUUID_Thermal_Default)); // Thermal
     EXPECT_FALSE(steel->isPhysicalModelComplete(Materials::ModelUUIDs::ModelUUID_Mechanical_LinearElastic)); // Legacy linear elastic - Not in the model
     EXPECT_TRUE(steel->isAppearanceModelComplete(Materials::ModelUUIDs::ModelUUID_Rendering_Basic)); // BasicRendering - inherited from Steel.FCMat