diff --git a/src/ifcblenderexport/blenderbim/bim/handler.py b/src/ifcblenderexport/blenderbim/bim/handler.py
index a6e32857ad..a8960d04cc 100644
--- a/src/ifcblenderexport/blenderbim/bim/handler.py
+++ b/src/ifcblenderexport/blenderbim/bim/handler.py
@@ -15,6 +15,16 @@ def loadIfcStore(scene):
         {k: bpy.data.objects.get(v) for k, v in json.loads(props.guid_map).items()} if props.id_map else {}
     )
 
+    # Purge data cache
+    from blenderbim.bim import modules
+    for module in modules.values():
+        if not module:
+            continue
+        try:
+            getattr(getattr(module, 'data'), 'Data').purge()
+        except AttributeError:
+            pass
+
 
 @persistent
 def storeIdMap(scene):
diff --git a/src/ifcblenderexport/blenderbim/bim/module/aggregate/data.py b/src/ifcblenderexport/blenderbim/bim/module/aggregate/data.py
index 883e6bd209..67ff085df2 100644
--- a/src/ifcblenderexport/blenderbim/bim/module/aggregate/data.py
+++ b/src/ifcblenderexport/blenderbim/bim/module/aggregate/data.py
@@ -4,6 +4,10 @@ from blenderbim.bim.ifc import IfcStore
 class Data:
     products = {}
 
+    @classmethod
+    def purge(cls):
+        cls.products = {}
+
     @classmethod
     def load(cls, product_id):
         file = IfcStore.get_file()
diff --git a/src/ifcblenderexport/blenderbim/bim/module/attribute/data.py b/src/ifcblenderexport/blenderbim/bim/module/attribute/data.py
index 4a90c6c5cc..be39c428ef 100644
--- a/src/ifcblenderexport/blenderbim/bim/module/attribute/data.py
+++ b/src/ifcblenderexport/blenderbim/bim/module/attribute/data.py
@@ -5,6 +5,10 @@ from blenderbim.bim.ifc import IfcStore
 class Data:
     products = {}
 
+    @classmethod
+    def purge(cls):
+        cls.products = {}
+
     @classmethod
     def load(cls, product_id):
         file = IfcStore.get_file()
diff --git a/src/ifcblenderexport/blenderbim/bim/module/classification/data.py b/src/ifcblenderexport/blenderbim/bim/module/classification/data.py
index 204fd23be3..0a5f8c367a 100644
--- a/src/ifcblenderexport/blenderbim/bim/module/classification/data.py
+++ b/src/ifcblenderexport/blenderbim/bim/module/classification/data.py
@@ -12,6 +12,16 @@ class Data:
     library_classifications = {}
     library_references = {}
 
+    @classmethod
+    def purge(cls):
+        cls.is_loaded = False
+        cls.products = {}
+        cls.classifications = {}
+        cls.references = {}
+        cls.library_file = None
+        cls.library_classifications = {}
+        cls.library_references = {}
+
     @classmethod
     def load(cls, product_id=None):
         cls._file = IfcStore.get_file()
diff --git a/src/ifcblenderexport/blenderbim/bim/module/constraint/data.py b/src/ifcblenderexport/blenderbim/bim/module/constraint/data.py
index e756d9f2c8..165a40902d 100644
--- a/src/ifcblenderexport/blenderbim/bim/module/constraint/data.py
+++ b/src/ifcblenderexport/blenderbim/bim/module/constraint/data.py
@@ -9,6 +9,12 @@ class Data:
     products = {}
     objectives = {}
 
+    @classmethod
+    def purge(cls):
+        cls.is_loaded = False
+        cls.products = {}
+        cls.objectives = {}
+
     @classmethod
     def load(cls, product_id=None):
         cls._file = IfcStore.get_file()
@@ -28,7 +34,7 @@ class Data:
         for association in product.HasAssociations:
             if association.is_a("IfcRelAssociatesConstraint"):
                 if not association.RelatingConstraint.is_a("IfcObjective"):
-                    continue # not yet implemented
+                    continue  # not yet implemented
                 cls.products[product_id].append(association.RelatingConstraint.id())
 
     @classmethod
diff --git a/src/ifcblenderexport/blenderbim/bim/module/context/data.py b/src/ifcblenderexport/blenderbim/bim/module/context/data.py
index 0832b264e5..200b777ff5 100644
--- a/src/ifcblenderexport/blenderbim/bim/module/context/data.py
+++ b/src/ifcblenderexport/blenderbim/bim/module/context/data.py
@@ -5,6 +5,11 @@ class Data:
     is_loaded = False
     contexts = {}
 
+    @classmethod
+    def purge(cls):
+        cls.is_loaded = False
+        cls.contexts = {}
+
     @classmethod
     def load(cls):
         file = IfcStore.get_file()
diff --git a/src/ifcblenderexport/blenderbim/bim/module/document/data.py b/src/ifcblenderexport/blenderbim/bim/module/document/data.py
index e618413f4a..1e3eb3184c 100644
--- a/src/ifcblenderexport/blenderbim/bim/module/document/data.py
+++ b/src/ifcblenderexport/blenderbim/bim/module/document/data.py
@@ -10,6 +10,13 @@ class Data:
     references = {}
     information = {}
 
+    @classmethod
+    def purge(cls):
+        cls.is_loaded = False
+        cls.products = {}
+        cls.references = {}
+        cls.information = {}
+
     @classmethod
     def load(cls, product_id=None):
         cls._file = IfcStore.get_file()
diff --git a/src/ifcblenderexport/blenderbim/bim/module/geometry/data.py b/src/ifcblenderexport/blenderbim/bim/module/geometry/data.py
index bce0641540..2e99e3aed3 100644
--- a/src/ifcblenderexport/blenderbim/bim/module/geometry/data.py
+++ b/src/ifcblenderexport/blenderbim/bim/module/geometry/data.py
@@ -5,6 +5,11 @@ class Data:
     products = {}
     representations = {}
 
+    @classmethod
+    def purge(cls):
+        cls.products = False
+        cls.representations = {}
+
     @classmethod
     def load(cls, product_id):
         file = IfcStore.get_file()
diff --git a/src/ifcblenderexport/blenderbim/bim/module/georeference/data.py b/src/ifcblenderexport/blenderbim/bim/module/georeference/data.py
index b91a2fd212..b6efe005db 100644
--- a/src/ifcblenderexport/blenderbim/bim/module/georeference/data.py
+++ b/src/ifcblenderexport/blenderbim/bim/module/georeference/data.py
@@ -6,6 +6,12 @@ class Data:
     map_conversion = {}
     projected_crs = {}
 
+    @classmethod
+    def purge(cls):
+        cls.is_loaded = False
+        cls.map_conversion = {}
+        cls.projected_crs = {}
+
     @classmethod
     def load(cls):
         file = IfcStore.get_file()
diff --git a/src/ifcblenderexport/blenderbim/bim/module/layer/data.py b/src/ifcblenderexport/blenderbim/bim/module/layer/data.py
index 97486b0db6..5c9a787564 100644
--- a/src/ifcblenderexport/blenderbim/bim/module/layer/data.py
+++ b/src/ifcblenderexport/blenderbim/bim/module/layer/data.py
@@ -9,6 +9,12 @@ class Data:
     items = {}
     layers = {}
 
+    @classmethod
+    def purge(cls):
+        cls.is_loaded = False
+        cls.items = {}
+        cls.layers = {}
+
     @classmethod
     def load(cls, item_id=None):
         cls._file = IfcStore.get_file()
diff --git a/src/ifcblenderexport/blenderbim/bim/module/material/data.py b/src/ifcblenderexport/blenderbim/bim/module/material/data.py
index 6ecc3153c8..630b7ae89d 100644
--- a/src/ifcblenderexport/blenderbim/bim/module/material/data.py
+++ b/src/ifcblenderexport/blenderbim/bim/module/material/data.py
@@ -15,6 +15,20 @@ class Data:
     products = {}
     _file = None
 
+    @classmethod
+    def purge(cls):
+        cls.is_loaded = False
+        cls.materials = {}
+        cls.constituent_sets = {}
+        cls.constituents = {}
+        cls.layer_sets = {}
+        cls.layers = {}
+        cls.profile_sets = {}
+        cls.profiles = {}
+        cls.lists = {}
+        cls.products = {}
+        cls._file = None
+
     @classmethod
     def load(cls, product_id=None):
         cls._file = IfcStore.get_file()
diff --git a/src/ifcblenderexport/blenderbim/bim/module/owner/data.py b/src/ifcblenderexport/blenderbim/bim/module/owner/data.py
index 8b1eba8c92..290becd1dd 100644
--- a/src/ifcblenderexport/blenderbim/bim/module/owner/data.py
+++ b/src/ifcblenderexport/blenderbim/bim/module/owner/data.py
@@ -8,6 +8,14 @@ class Data:
     addresses = {}
     roles = {}
 
+    @classmethod
+    def purge(cls):
+        cls.is_loaded = False
+        cls.people = {}
+        cls.organisations = {}
+        cls.addresses = {}
+        cls.roles = {}
+
     @classmethod
     def load(cls):
         file = IfcStore.get_file()
diff --git a/src/ifcblenderexport/blenderbim/bim/module/pset/data.py b/src/ifcblenderexport/blenderbim/bim/module/pset/data.py
index adedabcdb5..ffa74c0e3a 100644
--- a/src/ifcblenderexport/blenderbim/bim/module/pset/data.py
+++ b/src/ifcblenderexport/blenderbim/bim/module/pset/data.py
@@ -8,6 +8,12 @@ class Data:
     psets = {}
     qtos = {}
 
+    @classmethod
+    def purge(cls):
+        cls.products = {}
+        cls.psets = {}
+        cls.qtos = {}
+
     @classmethod
     def load(cls, product_id):
         file = IfcStore.get_file()
diff --git a/src/ifcblenderexport/blenderbim/bim/module/root/data.py b/src/ifcblenderexport/blenderbim/bim/module/root/data.py
index e0f186e1ac..445ece8e37 100644
--- a/src/ifcblenderexport/blenderbim/bim/module/root/data.py
+++ b/src/ifcblenderexport/blenderbim/bim/module/root/data.py
@@ -4,6 +4,10 @@ from blenderbim.bim.ifc import IfcStore
 class Data:
     products = {}
 
+    @classmethod
+    def purge(cls):
+        cls.products = {}
+
     @classmethod
     def load(cls, product_id):
         file = IfcStore.get_file()
diff --git a/src/ifcblenderexport/blenderbim/bim/module/spatial/data.py b/src/ifcblenderexport/blenderbim/bim/module/spatial/data.py
index cf74825e33..e442acd786 100644
--- a/src/ifcblenderexport/blenderbim/bim/module/spatial/data.py
+++ b/src/ifcblenderexport/blenderbim/bim/module/spatial/data.py
@@ -4,6 +4,10 @@ from blenderbim.bim.ifc import IfcStore
 class Data:
     products = {}
 
+    @classmethod
+    def purge(cls):
+        cls.products = {}
+
     @classmethod
     def load(cls, product_id):
         file = IfcStore.get_file()
diff --git a/src/ifcblenderexport/blenderbim/bim/module/type/data.py b/src/ifcblenderexport/blenderbim/bim/module/type/data.py
index 8201945cb7..696db35582 100644
--- a/src/ifcblenderexport/blenderbim/bim/module/type/data.py
+++ b/src/ifcblenderexport/blenderbim/bim/module/type/data.py
@@ -4,6 +4,10 @@ from blenderbim.bim.ifc import IfcStore
 class Data:
     products = {}
 
+    @classmethod
+    def purge(cls):
+        cls.products = {}
+
     @classmethod
     def load(cls, product_id):
         file = IfcStore.get_file()
diff --git a/src/ifcblenderexport/blenderbim/bim/module/unit/data.py b/src/ifcblenderexport/blenderbim/bim/module/unit/data.py
index f61a07c58b..08e1198d55 100644
--- a/src/ifcblenderexport/blenderbim/bim/module/unit/data.py
+++ b/src/ifcblenderexport/blenderbim/bim/module/unit/data.py
@@ -5,6 +5,11 @@ class Data:
     is_loaded = False
     units = {}
 
+    @classmethod
+    def purge(cls):
+        cls.is_loaded = False
+        cls.units = {}
+
     @classmethod
     def load(cls):
         file = IfcStore.get_file()
diff --git a/src/ifcblenderexport/blenderbim/bim/module/void/data.py b/src/ifcblenderexport/blenderbim/bim/module/void/data.py
index 363405b4ca..84c80f3fb0 100644
--- a/src/ifcblenderexport/blenderbim/bim/module/void/data.py
+++ b/src/ifcblenderexport/blenderbim/bim/module/void/data.py
@@ -6,6 +6,12 @@ class Data:
     openings = {}
     fillings = {}
 
+    @classmethod
+    def purge(cls):
+        cls.products = {}
+        cls.openings = {}
+        cls.fillings = {}
+
     @classmethod
     def load(cls, product_id):
         file = IfcStore.get_file()