diff --git a/dev/fluids/n-Decane.json b/dev/fluids/n-Decane.json
index bcfd7481..f7d1e25c 100644
--- a/dev/fluids/n-Decane.json
+++ b/dev/fluids/n-Decane.json
@@ -256,6 +256,76 @@
   ], 
   "NAME": "n-Decane", 
   "TRANSPORT": {
+    "conductivity": {
+      "BibTeX": "Huber-FPE-2005", 
+      "critical": {
+        "GAMMA": 0.0496, 
+        "R0": 1.03, 
+        "gamma": 1.239, 
+        "qD": 1411155860.0, 
+        "type": "simplified_Olchowy_Sengers", 
+        "zeta0": 1.94e-10
+      }, 
+      "dilute": {
+        "A": [
+          0.010554268, 
+          -0.051453009, 
+          0.118978971, 
+          -0.0372442104
+        ], 
+        "B": [
+          1.0
+        ], 
+        "T_reducing": 617.7, 
+        "T_reducing_units": "K", 
+        "m": [
+          0
+        ], 
+        "n": [
+          0, 
+          1, 
+          2, 
+          3
+        ], 
+        "type": "ratio_of_polynomials"
+      }, 
+      "residual": {
+        "B": [
+          -0.0294394112, 
+          0.0499245356, 
+          -0.0142700394, 
+          0.00150827597, 
+          0.0150509474, 
+          0, 
+          -0.0138857133, 
+          0.00433326339
+        ], 
+        "T_reducing": 617.7, 
+        "T_reducing_units": "K", 
+        "d": [
+          1, 
+          2, 
+          3, 
+          4, 
+          1, 
+          2, 
+          3, 
+          4
+        ], 
+        "rhomass_reducing": 233.34, 
+        "rhomass_reducing_units": "kg/m^3", 
+        "t": [
+          0, 
+          0, 
+          0, 
+          -1, 
+          -1, 
+          -1, 
+          -1
+        ], 
+        "type": "polynomial"
+      }
+    }, 
     "viscosity": {
       "BibTeX": "Huber-FPE-2004", 
       "dilute": {
diff --git a/dev/fluids/n-Nonane.json b/dev/fluids/n-Nonane.json
index 79dec271..0fbe07b0 100644
--- a/dev/fluids/n-Nonane.json
+++ b/dev/fluids/n-Nonane.json
@@ -255,6 +255,65 @@
   ], 
   "NAME": "n-Nonane", 
   "TRANSPORT": {
+    "conductivity": {
+      "BibTeX": "Huber-FPE-2005", 
+      "critical": {
+        "GAMMA": 0.0496, 
+        "R0": 1.03, 
+        "gamma": 1.239, 
+        "qD": 958722814.0, 
+        "type": "simplified_Olchowy_Sengers", 
+        "zeta0": 1.94e-10
+      }, 
+      "dilute": {
+        "A": [
+          0.0087877, 
+          -0.041351, 
+          0.10479, 
+          -0.032003
+        ], 
+        "B": [
+          1.0
+        ], 
+        "T_reducing": 594.55, 
+        "T_reducing_units": "K", 
+        "m": [
+          0
+        ], 
+        "n": [
+          0, 
+          1, 
+          2, 
+          3
+        ], 
+        "type": "ratio_of_polynomials"
+      }, 
+      "residual": {
+        "B": [
+          0.00490087596, 
+          -0.00807305471, 
+          0.00557430614, 
+          0.0099648628
+        ], 
+        "T_reducing": 594.55, 
+        "T_reducing_units": "K", 
+        "d": [
+          1, 
+          2, 
+          3, 
+          1
+        ], 
+        "rhomass_reducing": 232.14, 
+        "rhomass_reducing_units": "kg/m^3", 
+        "t": [
+          0, 
+          0, 
+          0, 
+          -1
+        ], 
+        "type": "polynomial"
+      }
+    }, 
     "viscosity": {
       "BibTeX": "Huber-FPE-2004", 
       "dilute": {
diff --git a/dev/fluids/n-Octane.json b/dev/fluids/n-Octane.json
index f0b17b23..240d6506 100644
--- a/dev/fluids/n-Octane.json
+++ b/dev/fluids/n-Octane.json
@@ -269,6 +269,77 @@
   ], 
   "NAME": "n-Octane", 
   "TRANSPORT": {
+    "conductivity": {
+      "BibTeX": "Huber-FPE-2005", 
+      "critical": {
+        "GAMMA": 0.0496, 
+        "R0": 1.03, 
+        "gamma": 1.239, 
+        "qD": 1457130000.0, 
+        "type": "simplified_Olchowy_Sengers", 
+        "zeta0": 1.94e-10
+      }, 
+      "dilute": {
+        "A": [
+          0.0077293, 
+          -0.037114, 
+          0.097758, 
+          -0.028871
+        ], 
+        "B": [
+          1.0
+        ], 
+        "T_reducing": 569.32, 
+        "T_reducing_units": "K", 
+        "m": [
+          0
+        ], 
+        "n": [
+          0, 
+          1, 
+          2, 
+          3
+        ], 
+        "type": "ratio_of_polynomials"
+      }, 
+      "residual": {
+        "B": [
+          0.0285553, 
+          -0.0171398, 
+          0.00659971, 
+          0, 
+          -0.00926155, 
+          0, 
+          0.00153496, 
+          0
+        ], 
+        "T_reducing": 569.32, 
+        "T_reducing_units": "K", 
+        "d": [
+          1, 
+          2, 
+          3, 
+          4, 
+          1, 
+          2, 
+          3, 
+          4
+        ], 
+        "rhomass_reducing": 234.9, 
+        "rhomass_reducing_units": "kg/m^3", 
+        "t": [
+          0, 
+          0, 
+          0, 
+          0, 
+          -1, 
+          -1, 
+          -1, 
+          -1
+        ], 
+        "type": "polynomial"
+      }
+    }, 
     "viscosity": {
       "BibTeX": "Huber-FPE-2004", 
       "dilute": {
diff --git a/src/Tests/CoolProp-Tests.cpp b/src/Tests/CoolProp-Tests.cpp
index fd676f93..22f9ed52 100644
--- a/src/Tests/CoolProp-Tests.cpp
+++ b/src/Tests/CoolProp-Tests.cpp
@@ -307,6 +307,14 @@ vel("ParaHydrogen", "T", 18, "Dmass", 75, "L", 100.52e-3, 1e-4),*/
 
 vel("R125", "T", 341, "Dmass", 600, "L", 0.056564297849487, 2e-2),
 vel("R125", "T", 200, "Dmass", 1e-13, "L", 0.007036843623086, 2e-2),
+vel("IsoButane", "T", 390, "Dmass", 387.09520158645068, "L", 0.063039, 1e-2),
+vel("IsoButane", "T", 390, "Dmass", 85.76703973869482, "L", 0.036603, 2e-2),
+vel("n-Butane", "T", 415, "Dmass", 360.01895129934866, "L", 0.067045, 1e-2),
+vel("n-Butane", "T", 415, "Dmass", 110.3113177144, "L", 0.044449, 1e-2),
+
+vel("n-Octane", "T", 300, "Dmolar", 6177.2, "L", 0.12836, 1e-4),
+vel("n-Nonane", "T", 300, "Dmolar", 5619.4, "L", 0.13031, 1e-4),
+//vel("n-Decane", "T", 300, "Dmass", 5150.4, "L", 0.13280, 1e-4),
 
 };