diff --git a/cura/CuraApplication.py b/cura/CuraApplication.py
index c9d2163609..e378224a04 100755
--- a/cura/CuraApplication.py
+++ b/cura/CuraApplication.py
@@ -85,6 +85,7 @@ from cura.Machines.Models.FirstStartMachineActionsModel import FirstStartMachine
 from cura.Machines.Models.GenericMaterialsModel import GenericMaterialsModel
 from cura.Machines.Models.GlobalStacksModel import GlobalStacksModel
 from cura.Machines.Models.MaterialBrandsModel import MaterialBrandsModel
+from cura.Machines.Models.MaterialManagementModel import MaterialManagementModel
 from cura.Machines.Models.MultiBuildPlateModel import MultiBuildPlateModel
 from cura.Machines.Models.NozzleModel import NozzleModel
 from cura.Machines.Models.QualityManagementModel import QualityManagementModel
@@ -1054,6 +1055,7 @@ class CuraApplication(QtApplication):
         qmlRegisterType(GenericMaterialsModel, "Cura", 1, 0, "GenericMaterialsModel")
         qmlRegisterType(MaterialBrandsModel, "Cura", 1, 0, "MaterialBrandsModel")
         qmlRegisterType(QualityManagementModel, "Cura", 1, 0, "QualityManagementModel")
+        qmlRegisterType(MaterialManagementModel, "Cura", 1, 5, "MaterialManagementModel")
 
         qmlRegisterType(DiscoveredPrintersModel, "Cura", 1, 0, "DiscoveredPrintersModel")
 
diff --git a/cura/Machines/MaterialManager.py b/cura/Machines/MaterialManager.py
index b19c8b7926..24995e417b 100644
--- a/cura/Machines/MaterialManager.py
+++ b/cura/Machines/MaterialManager.py
@@ -1,5 +1,6 @@
 # Copyright (c) 2019 Ultimaker B.V.
 # Cura is released under the terms of the LGPLv3 or higher.
+
 from collections import defaultdict
 import copy
 import uuid
@@ -7,19 +8,16 @@ from typing import Dict, Optional, TYPE_CHECKING, Any, List, cast
 
 from PyQt5.Qt import QTimer, QObject, pyqtSignal, pyqtSlot
 
-from UM.ConfigurationErrorMessage import ConfigurationErrorMessage
 from UM.Decorators import deprecated
 from UM.Logger import Logger
 from UM.Settings.ContainerRegistry import ContainerRegistry
-from UM.Settings.SettingFunction import SettingFunction
 from UM.Util import parseBool
-import cura.CuraApplication #Imported like this to prevent circular imports.
+import cura.CuraApplication  # Imported like this to prevent circular imports.
 from cura.Machines.ContainerTree import ContainerTree
 from cura.Settings.CuraContainerRegistry import CuraContainerRegistry
 
 from .MaterialNode import MaterialNode
 from .MaterialGroup import MaterialGroup
-from .VariantType import VariantType
 
 if TYPE_CHECKING:
     from UM.Settings.DefinitionContainer import DefinitionContainer
@@ -260,8 +258,8 @@ class MaterialManager(QObject):
         # Check if the material is active in any extruder train. In that case, the material shouldn't be removed!
         # In the future we might enable this again, but right now, it's causing a ton of issues if we do (since it
         # corrupts the configuration)
-        root_material_id = material_node.container.getMetaDataEntry("base_file")
-        ids_to_remove = [metadata.get("id", "") for metadata in CuraContainerRegistry.getInstance().findInstanceContainersMetadata(base_file=root_material_id)]
+        root_material_id = material_node.base_file
+        ids_to_remove = {metadata.get("id", "") for metadata in CuraContainerRegistry.getInstance().findInstanceContainersMetadata(base_file = root_material_id)}
 
         for extruder_stack in CuraContainerRegistry.getInstance().findContainerStacks(type = "extruder_train"):
             if extruder_stack.material.getId() in ids_to_remove:
diff --git a/cura/Machines/Models/MaterialManagementModel.py b/cura/Machines/Models/MaterialManagementModel.py
new file mode 100644
index 0000000000..9cc7cb07c9
--- /dev/null
+++ b/cura/Machines/Models/MaterialManagementModel.py
@@ -0,0 +1,33 @@
+# Copyright (c) 2019 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from PyQt5.QtCore import QObject, pyqtSlot  # To allow the preference page proxy to be used from the actual preferences page.
+from typing import TYPE_CHECKING
+
+from cura.Settings.CuraContainerRegistry import CuraContainerRegistry  # To find the sets of materials belonging to each other, and currently loaded extruder stacks.
+
+if TYPE_CHECKING:
+    from cura.Machines.MaterialNode import MaterialNode
+
+##  Proxy class to the materials page in the preferences.
+#
+#   This class handles the actions in that page, such as creating new materials,
+#   renaming them, etc.
+class MaterialManagementModel(QObject):
+    ##  Can a certain material be deleted, or is it still in use in one of the
+    #   container stacks anywhere?
+    #
+    #   We forbid the user from deleting a material if it's in use in any stack.
+    #   Deleting it while it's in use can lead to corrupted stacks. In the
+    #   future we might enable this functionality again (deleting the material
+    #   from those stacks) but for now it is easier to prevent the user from
+    #   doing this.
+    #   \return Whether or not the material can be removed.
+    @pyqtSlot("QVariant", result = bool)
+    def canMaterialBeRemoved(self, material_node: "MaterialNode"):
+        container_registry = CuraContainerRegistry.getInstance()
+        ids_to_remove = {metadata.get("id", "") for metadata in container_registry.findInstanceContainersMetadata(base_file = material_node.base_file)}
+        for extruder_stack in container_registry.findContainerStacks(type = "extruder_train"):
+            if extruder_stack.material.getId() in ids_to_remove:
+                return False
+        return True
\ No newline at end of file
diff --git a/resources/qml/Preferences/Materials/MaterialsPage.qml b/resources/qml/Preferences/Materials/MaterialsPage.qml
index 481a256501..80d746351c 100644
--- a/resources/qml/Preferences/Materials/MaterialsPage.qml
+++ b/resources/qml/Preferences/Materials/MaterialsPage.qml
@@ -7,7 +7,7 @@ import QtQuick.Layouts 1.3
 import QtQuick.Dialogs 1.2
 
 import UM 1.2 as UM
-import Cura 1.0 as Cura
+import Cura 1.5 as Cura
 
 Item
 {
@@ -42,6 +42,11 @@ Item
         name: "cura"
     }
 
+    Cura.MaterialManagementModel
+    {
+        id: materialManagement
+    }
+
     function resetExpandedActiveMaterial()
     {
         materialListView.expandActiveMaterial(active_root_material_id)
@@ -147,7 +152,7 @@ Item
             id: removeMenuButton
             text: catalog.i18nc("@action:button", "Remove")
             iconName: "list-remove"
-            enabled: base.hasCurrentItem && !base.currentItem.is_read_only && !base.isCurrentItemActivated && base.materialManager.canMaterialBeRemoved(base.currentItem.container_node)
+            enabled: base.hasCurrentItem && !base.currentItem.is_read_only && !base.isCurrentItemActivated && materialManagement.canMaterialBeRemoved(base.currentItem.container_node)
 
             onClicked:
             {