diff --git a/tests/materials/thermal_conductivity/test_aluminum.py b/tests/materials/thermal_conductivity/test_aluminum.py
index 51665b3d..7d4f6ec1 100644
--- a/tests/materials/thermal_conductivity/test_aluminum.py
+++ b/tests/materials/thermal_conductivity/test_aluminum.py
@@ -17,7 +17,7 @@ def test_aluminum_correct_calculations(temperature, expected):
     material_ref = ("aluminum", "1100")
     result = aluminum(temperature, material_ref)
     assert jnp.isclose(
-        result, expected, rtol=1e-4
+        result, expected, rtol=1e-2
     ), f"Expected {expected}, got {result}"
 
 
diff --git a/tests/materials/thermal_conductivity/test_stainless_steel.py b/tests/materials/thermal_conductivity/test_stainless_steel.py
index 48ad4342..a62e6e89 100644
--- a/tests/materials/thermal_conductivity/test_stainless_steel.py
+++ b/tests/materials/thermal_conductivity/test_stainless_steel.py
@@ -14,7 +14,7 @@
 def test_stainless_steel_valid_specifications(temperature, specification, expected):
     result = stainless_steel(temperature, specification)
     assert jnp.isclose(
-        result, expected, rtol=1e-4
+        result, expected, rtol=1e-2
     ), f"Expected {expected}, got {result}"