diff --git a/saltproc/depcode.py b/saltproc/depcode.py
index 16cf83776..65e1dd691 100644
--- a/saltproc/depcode.py
+++ b/saltproc/depcode.py
@@ -212,6 +212,8 @@ def __init__(self,
                          active_cycles,
                          inactive_cycles)
 
+        self.fix_dict = {}
+
     def change_sim_par(self, template_data):
         """Finds simulation parameters (neutron population, cycles) in the
         Serpent2 template file and change them to the parameters from the
@@ -246,6 +248,20 @@ def change_sim_par(self, template_data):
                                            self.inactive_cycles)
         return [s.replace(sim_param[0], args) for s in template_data]
 
+    def create_fix_dict(self):
+        """ Creates dictionary of material names to the value of their 'fix' card as well as
+        library information for decay-only nuclides"""
+        mat_data = self.read_plaintext_file(self.iter_matfile)
+        mat_cards = [s for s in mat_data if s.startswith("mat ")]
+        for mat_card in mat_cards:
+            mat_name = mat_card.split()[1]
+            fix_regex = "\s+fix\s+[a-zA-Z0-9]+\s+[0-9]+(\.[0-9]+)?"
+            fix_match = re.search(fix_regex, mat_card)
+            if bool(fix_match):
+                fix_params = fix_match.group(0).split()[1:]
+                fix_params[1] = float(fix_params[1])
+                self.fix_dict.update({mat_name: fix_params})
+
     def create_iter_matfile(self, template_data):
         """Finds ``include`` line with path to material file, copies content of
         this file to iteration material file, changes path in ``include`` line
@@ -441,6 +457,7 @@ def read_dep_comp(self, read_at_end=False):
             mats[m].density = dep['MAT_' + m + '_MDENS'][-1, moment]
             mats[m].mass = mats[m].density * volume
             mats[m].vol = volume
+            mats[m].temp = self.fix_dict[m][1]
             mats[m].burnup = dep['MAT_' + m + '_BURNUP'][moment]
         self.create_nuclide_name_map_zam_to_serpent()
         return mats
@@ -670,6 +687,7 @@ def write_depcode_input(
             data = self.insert_path_to_geometry(data)
             data = self.change_sim_par(data)
             data = self.create_iter_matfile(data)
+            self.create_fix_dict()
         else:
             data = self.read_plaintext_file(self.iter_inputfile)
         data = self.replace_burnup_parameters(data, reactor, dep_step)
@@ -705,8 +723,8 @@ def write_mat_file(self, dep_dict, dep_end_time):
             matf.write('mat  %s  %5.9E burn 1 fix %3s %4i vol %7.5E\n' %
                        (key,
                         -dep_dict[key].density,
-                        '09c',
-                        dep_dict[key].temp,
+                        self.fix_dict[key][0],
+                        self.fix_dict[key][1],
                         dep_dict[key].vol))
             for nuc_code, wt_frac in dep_dict[key].comp.items():
                 # Transforms iso name from zas to zzaaam and then to SERPENT