diff -u -r1.5 -r1.6
--- materials.xml	14 Jul 2005 20:40:33 -0000	1.5
+++ materials.xml	16 Jul 2005 01:11:36 -0000	1.6
@@ -102,4 +102,20 @@

 	<D type="density" value="0.0056" unit="g/cm3"/>
 	<fraction n="1.0" ref="Polystyrene"/>
       </material>

+      
+      <material name="Kapton">
+        <D value="1.43" unit="g/cm3" />
+        <composite n="22" ref="C"/>
+        <composite n="10" ref="H" />
+        <composite n="2" ref="N" />
+        <composite n="5" ref="O" />
+      </material>
+
+      <material name="PEEK">
+        <D value="1.37" unit="g/cm3" />
+        <composite n="19" ref="C"/>
+        <composite n="12" ref="H" />
+        <composite n="3" ref="O" />
+      </material>
+      

 </materials>