diff --git a/ProcessLib/HydroMechanics/CreateHydroMechanicsProcess.cpp b/ProcessLib/HydroMechanics/CreateHydroMechanicsProcess.cpp
index 26ad711fb421f5d39bd13ab5ad3664147f5a7441..06496c002e235701c0cd3ba0e3cf4714e7175756 100644
--- a/ProcessLib/HydroMechanics/CreateHydroMechanicsProcess.cpp
+++ b/ProcessLib/HydroMechanics/CreateHydroMechanicsProcess.cpp
@@ -128,21 +128,6 @@ std::unique_ptr<Process> createHydroMechanicsProcess(
         "fluid_density", parameters, 1, &mesh);
     DBUG("Use '%s' as fluid density parameter.", fluid_density.name.c_str());
 
-    // Biot coefficient
-    auto& biot_coefficient = ParameterLib::findParameter<double>(
-        config,
-        //! \ogs_file_param_special{prj__processes__process__HYDRO_MECHANICS__biot_coefficient}
-        "biot_coefficient", parameters, 1, &mesh);
-    DBUG("Use '%s' as Biot coefficient parameter.",
-         biot_coefficient.name.c_str());
-
-    // Solid density
-    auto& solid_density = ParameterLib::findParameter<double>(
-        config,
-        //! \ogs_file_param_special{prj__processes__process__HYDRO_MECHANICS__solid_density}
-        "solid_density", parameters, 1, &mesh);
-    DBUG("Use '%s' as solid density parameter.", solid_density.name.c_str());
-
     // Specific body force
     Eigen::Matrix<double, DisplacementDim, 1> specific_body_force;
     {
@@ -166,7 +151,9 @@ std::unique_ptr<Process> createHydroMechanicsProcess(
         MaterialPropertyLib::createMaterialSpatialDistributionMap(media, mesh);
 
     std::array const requiredGasProperties = {MaterialPropertyLib::viscosity};
-    std::array const requiredSolidProperties = {MaterialPropertyLib::porosity};
+    std::array const requiredSolidProperties = {
+        MaterialPropertyLib::porosity, MaterialPropertyLib::biot_coefficient,
+        MaterialPropertyLib::density};
     for (auto const& m : media)
     {
         m.second->phase("Gas").checkRequiredProperties(requiredGasProperties);
@@ -220,8 +207,7 @@ std::unique_ptr<Process> createHydroMechanicsProcess(
         materialIDs(mesh),     std::move(media_map),
         std::move(solid_constitutive_relations),
         initial_stress,        intrinsic_permeability,
-        fluid_density,         biot_coefficient,
-        solid_density,         specific_body_force,
+        fluid_density,         specific_body_force,
         fluid_compressibility, reference_temperature,
         specific_gas_constant, fluid_type};
 
diff --git a/ProcessLib/HydroMechanics/HydroMechanicsFEM-impl.h b/ProcessLib/HydroMechanics/HydroMechanicsFEM-impl.h
index d0527129ee60a9958b3f76aef49d7d45c06a989d..dbee0bf33b50cc0a6813c24170348277a8b563b5 100644
--- a/ProcessLib/HydroMechanics/HydroMechanicsFEM-impl.h
+++ b/ProcessLib/HydroMechanics/HydroMechanicsFEM-impl.h
@@ -220,9 +220,14 @@ void HydroMechanicsLocalAssembler<ShapeFunctionDisplacement,
         double const K_over_mu =
             _process_data.intrinsic_permeability(t, x_position)[0] / mu;
 
-        auto const alpha = _process_data.biot_coefficient(t, x_position)[0];
+        auto const alpha =
+            solid_phase
+                .property(MaterialPropertyLib::PropertyType::biot_coefficient)
+                .template value<double>(vars, x_position, t);
         auto const K_S = solid_material.getBulkModulus(t, x_position);
-        auto const rho_sr = _process_data.solid_density(t, x_position)[0];
+        auto const rho_sr =
+            solid_phase.property(MaterialPropertyLib::PropertyType::density)
+                .template value<double>(vars, x_position, t);
         // TODO (FZill) get fluid properties from GPML
         double const p_fr =
             (_process_data.fluid_type == FluidType::Fluid_Type::IDEAL_GAS)
@@ -438,7 +443,10 @@ void HydroMechanicsLocalAssembler<ShapeFunctionDisplacement,
 
         double const K_over_mu =
             _process_data.intrinsic_permeability(t, x_position)[0] / mu;
-        auto const alpha_b = _process_data.biot_coefficient(t, x_position)[0];
+        auto const alpha_b =
+            solid_phase
+                .property(MaterialPropertyLib::PropertyType::biot_coefficient)
+                .template value<double>(vars, x_position, t);
         // TODO (FZill) get fluid properties from GPML
         double const p_fr =
             (_process_data.fluid_type == FluidType::Fluid_Type::IDEAL_GAS)
@@ -542,8 +550,13 @@ void HydroMechanicsLocalAssembler<ShapeFunctionDisplacement,
         auto& eps = _ip_data[ip].eps;
         auto const& sigma_eff = _ip_data[ip].sigma_eff;
 
-        auto const alpha = _process_data.biot_coefficient(t, x_position)[0];
-        auto const rho_sr = _process_data.solid_density(t, x_position)[0];
+        auto const alpha =
+            solid_phase
+                .property(MaterialPropertyLib::PropertyType::biot_coefficient)
+                .template value<double>(vars, x_position, t);
+        auto const rho_sr =
+            solid_phase.property(MaterialPropertyLib::PropertyType::density)
+                .template value<double>(vars, x_position, t);
         auto const rho_fr = _process_data.fluid_density(t, x_position)[0];
         auto const porosity =
             solid_phase.property(MaterialPropertyLib::PropertyType::porosity)
diff --git a/ProcessLib/HydroMechanics/HydroMechanicsProcessData.h b/ProcessLib/HydroMechanics/HydroMechanicsProcessData.h
index 7f1d59f54f908f78e5eaa470cccdbc37d320bbf9..74b694ec7c15eafdbd8a5b01b13a34ee8acca9d3 100644
--- a/ProcessLib/HydroMechanics/HydroMechanicsProcessData.h
+++ b/ProcessLib/HydroMechanics/HydroMechanicsProcessData.h
@@ -56,10 +56,6 @@ struct HydroMechanicsProcessData
     ParameterLib::Parameter<double> const& intrinsic_permeability;
     /// Fluid's density. A scalar quantity, ParameterLib::Parameter<double>.
     ParameterLib::Parameter<double> const& fluid_density;
-    /// Biot coefficient. A scalar quantity, ParameterLib::Parameter<double>.
-    ParameterLib::Parameter<double> const& biot_coefficient;
-    /// Solid's density. A scalar quantity, ParameterLib::Parameter<double>.
-    ParameterLib::Parameter<double> const& solid_density;
     /// Specific body forces applied to solid and fluid.
     /// It is usually used to apply gravitational forces.
     /// A vector of displacement dimension's length.