diff --git a/AUTHORS.md b/AUTHORS.md
deleted file mode 100644
index 5a082bc..0000000
--- a/AUTHORS.md
+++ /dev/null
@@ -1,4 +0,0 @@
-Jonathan Shimwell
-John Billingsley
-Matti Coleman
-Ross Worrall
\ No newline at end of file
diff --git a/neutronics_material_maker/data/insulators.json b/neutronics_material_maker/data/insulators.json
new file mode 100644
index 0000000..1ca7490
--- /dev/null
+++ b/neutronics_material_maker/data/insulators.json
@@ -0,0 +1,12 @@
+{
+    "Rexolite 1422": {
+        "elements": {
+            "C": 1.0
+        },
+        "density": 1.06,
+        "density_unit": "g/cm3",
+        "comment": "Rexolite 1422 http://hdl.handle.net/11375/24061",
+        "percent_type": "wo"
+    }
+}
+    
\ No newline at end of file