diff --git a/compact/materials.xml b/compact/materials.xml
index dd89084b2f3c19e9d097085325314a5fdd848753..bdc108fccfc954bd6cf2d6d4f4d81e5385e97cc9 100644
--- a/compact/materials.xml
+++ b/compact/materials.xml
@@ -348,5 +348,9 @@
     <composite n="0.009" ref="H"/>
     <composite n="0.041"  ref="C"/>
   </material>
-
+  <material name="WSciFi_UCLA_Abs">
+    <D type="density" value="12.4" unit="g / cm3"/>
+    <fraction n="0.96" ref="W"/>
+    <fraction n="0.04" ref="Polystyrene"/>
+  </material>  
 </materials>