diff --git a/src/paveit/datamodels/material.py b/src/paveit/datamodels/material.py
index 9d3b4a8..e2e705c 100755
--- a/src/paveit/datamodels/material.py
+++ b/src/paveit/datamodels/material.py
@@ -6,6 +6,8 @@ from mongoengine import *
 from .project import Project
 from .usermanagement import Organisation, User
 from .norm_specification import DeliveryGrain
+from .enumeration import BitumenCategoryEnum, NormEnum
+
 
 
 class Material(Document):
@@ -56,14 +58,28 @@ class Asphalt(Material):
     young_modulus = DictField()
     fatigue = DictField()
 
+# Bitumen 
+
+class BitumenParameterStrassenbaubitumen(EnumerateBase):
+    
+    penetration = FloatField(min_value=0, max_value=1000)
+    softening_point = FloatField(min_value=0, max_value =500)
+    flash_point = FloatField(min_value=0, max_value=500)
+    solubility = FloatField(default=99.0, min_value=0, max_value=100)
+    fraass_breaking_point = FloatField(min_value=-100, max_value=100)
+    hardening_resistance_penetration = FloatField(min_value=0, max_value=100)
+    hardening_resistance_softening_point= FloatField(min_value=0, max_value=100)
+    hardening_resistance_masschange = FloatField(min_value=0, max_value=100)
 
 class Bitumen(Material):
-    norm = StringField(required=False, default='TP Asphalt Teil 24')
-
     name = StringField()
-    material = StringField()
-
-    young_modulus = DictField()
+    
+    category = EnumField(BitumenCategoryEnum, required=True)
+    norm = EnumField(NormEnum, default=NormEnum.TLBitumen2019)
+    
+    parameter = ReferenceField(EnumerateBase)
+    limits = LazyReferenceField(EnumerateBase)
+    
 
 
 class Bitumenemulsion(Material):
diff --git a/src/paveit/datamodels/norm_specification.py b/src/paveit/datamodels/norm_specification.py
index fa71de4..7beb9ba 100644
--- a/src/paveit/datamodels/norm_specification.py
+++ b/src/paveit/datamodels/norm_specification.py
@@ -21,18 +21,7 @@ class DeliveryGrain(EnumerateBase):
     norm = StringField(required=True, default='TL Gestein-StB 04 (2018)')
     
 # Bitumen
-class BitumenParameterStrassenbaubitumen(EnumerateBase):
-    
-    norm = EnumField(NormEnum, default=NormEnum.TLBitumen2019)
-    
-    penetration = FloatField(min_value=0, max_value=1000)
-    softening_point = FloatField(min_value=0, max_value =500)
-    flash_point = FloatField(min_value=0, max_value=500)
-    solubility = FloatField(default=99.0, min_value=0, max_value=100)
-    fraass_breaking_point = FloatField(min_value=-100, max_value=100)
-    hardening_resistance_penetration = FloatField(min_value=0, max_value=100)
-    hardening_resistance_softening_point= FloatField(min_value=0, max_value=100)
-    hardening_resistance_masschange = FloatField(min_value=0, max_value=100)
+
     
 
 class BitumenParameterLimitsStrassenbaubitumen(EnumerateBase):
@@ -93,15 +82,7 @@ class BitumenParameterLimitsStrassenbaubitumen(EnumerateBase):
     hardening_resistance_masschange_max = FloatField(min_value=0, max_value=100)
      	 
 
-class Bitumen(EnumerateBase):
-    name = StringField()
-    
-    category = EnumField(BitumenCategoryEnum, required=True)
-    norm = EnumField(NormEnum, required=True)
-    
-    parameter = ReferenceField(EnumerateBase)
-    limits = LazyReferenceField(EnumerateBase)
-    
+
 # Asphalt
 class Asphalt(EnumerateBase):
     name = StringField()