Based on
 - https://developer.blender.org/rBbdc537e0a7b4b62af049dd4d508d5b08a4fa8b3b
 - https://developer.blender.org/rB05697470ab0dde6646be939ae57a95c9d4099e0b
diff --git intern/cycles/render/volume.cpp intern/cycles/render/volume.cpp
index 358ef71d501..a0a16d7c52f 100644
--- intern/cycles/render/volume.cpp
+++ intern/cycles/render/volume.cpp
@@ -271,7 +271,8 @@ void VolumeMeshBuilder::add_grid(openvdb::GridBase::ConstPtr grid,
 void VolumeMeshBuilder::add_padding(int pad_size)
 {
 #ifdef WITH_OPENVDB
-  openvdb::tools::dilateVoxels(topology_grid->tree(), pad_size);
+  openvdb::tools::dilateActiveValues(
+      topology_grid->tree(), pad_size, openvdb::tools::NN_FACE, openvdb::tools::IGNORE_TILES);
 #else
   (void)pad_size;
 #endif
diff --git source/blender/blenkernel/BKE_volume.h source/blender/blenkernel/BKE_volume.h
index cf755827a6c..5a96b70514e 100644
--- source/blender/blenkernel/BKE_volume.h
+++ source/blender/blenkernel/BKE_volume.h
@@ -103,7 +103,6 @@ typedef enum VolumeGridType {
   VOLUME_GRID_INT,
   VOLUME_GRID_INT64,
   VOLUME_GRID_MASK,
-  VOLUME_GRID_STRING,
   VOLUME_GRID_VECTOR_FLOAT,
   VOLUME_GRID_VECTOR_DOUBLE,
   VOLUME_GRID_VECTOR_INT,
@@ -203,8 +202,6 @@ auto BKE_volume_grid_type_operation(const VolumeGridType grid_type, OpType &&op)
       return op.template operator()<openvdb::Vec3IGrid>();
     case VOLUME_GRID_VECTOR_DOUBLE:
       return op.template operator()<openvdb::Vec3dGrid>();
-    case VOLUME_GRID_STRING:
-      return op.template operator()<openvdb::StringGrid>();
     case VOLUME_GRID_MASK:
       return op.template operator()<openvdb::MaskGrid>();
     case VOLUME_GRID_POINTS:
diff --git source/blender/blenkernel/intern/volume.cc source/blender/blenkernel/intern/volume.cc
index 7b03839f659..6b745d0bb3e 100644
--- source/blender/blenkernel/intern/volume.cc
+++ source/blender/blenkernel/intern/volume.cc
@@ -1300,9 +1300,6 @@ VolumeGridType BKE_volume_grid_type_openvdb(const openvdb::GridBase &grid)
   if (grid.isType<openvdb::Vec3dGrid>()) {
     return VOLUME_GRID_VECTOR_DOUBLE;
   }
-  if (grid.isType<openvdb::StringGrid>()) {
-    return VOLUME_GRID_STRING;
-  }
   if (grid.isType<openvdb::MaskGrid>()) {
     return VOLUME_GRID_MASK;
   }
@@ -1338,7 +1335,6 @@ int BKE_volume_grid_channels(const VolumeGrid *grid)
     case VOLUME_GRID_VECTOR_DOUBLE:
     case VOLUME_GRID_VECTOR_INT:
       return 3;
-    case VOLUME_GRID_STRING:
     case VOLUME_GRID_POINTS:
     case VOLUME_GRID_UNKNOWN:
       return 0;
@@ -1570,13 +1566,8 @@ struct CreateGridWithChangedResolutionOp {
 
   template<typename GridType> typename openvdb::GridBase::Ptr operator()()
   {
-    if constexpr (std::is_same_v<GridType, openvdb::StringGrid>) {
-      return {};
-    }
-    else {
-      return create_grid_with_changed_resolution(static_cast<const GridType &>(grid),
-                                                 resolution_factor);
-    }
+    return create_grid_with_changed_resolution(static_cast<const GridType &>(grid),
+                                               resolution_factor);
   }
 };
 
diff --git source/blender/blenkernel/intern/volume_render.cc source/blender/blenkernel/intern/volume_render.cc
index 6dc497bb616..57c7773d7be 100644
--- source/blender/blenkernel/intern/volume_render.cc
+++ source/blender/blenkernel/intern/volume_render.cc
@@ -77,7 +77,6 @@ static void extract_dense_float_voxels(const VolumeGridType grid_type,
     case VOLUME_GRID_VECTOR_INT:
       return extract_dense_voxels<openvdb::Vec3IGrid, openvdb::Vec3f>(
           grid, bbox, reinterpret_cast<openvdb::Vec3f *>(r_voxels));
-    case VOLUME_GRID_STRING:
     case VOLUME_GRID_POINTS:
     case VOLUME_GRID_UNKNOWN:
       /* Zero channels to copy. */
diff --git source/blender/makesrna/intern/rna_volume.c source/blender/makesrna/intern/rna_volume.c
index 76db6f3e325..32c59d5f359 100644
--- source/blender/makesrna/intern/rna_volume.c
+++ source/blender/makesrna/intern/rna_volume.c
@@ -241,7 +241,6 @@ static void rna_def_volume_grid(BlenderRNA *brna)
       {VOLUME_GRID_INT, "INT", 0, "Integer", "32-bit integer"},
       {VOLUME_GRID_INT64, "INT64", 0, "Integer 64-bit", "64-bit integer"},
       {VOLUME_GRID_MASK, "MASK", 0, "Mask", "No data, boolean mask of active voxels"},
-      {VOLUME_GRID_STRING, "STRING", 0, "String", "Text string"},
       {VOLUME_GRID_VECTOR_FLOAT, "VECTOR_FLOAT", 0, "Float Vector", "3D float vector"},
       {VOLUME_GRID_VECTOR_DOUBLE, "VECTOR_DOUBLE", 0, "Double Vector", "3D double vector"},
       {VOLUME_GRID_VECTOR_INT, "VECTOR_INT", 0, "Integer Vector", "3D integer vector"},
diff --git source/blender/modifiers/intern/MOD_volume_displace.cc source/blender/modifiers/intern/MOD_volume_displace.cc
index e7c4004853e..e74ea3656b3 100644
--- source/blender/modifiers/intern/MOD_volume_displace.cc
+++ source/blender/modifiers/intern/MOD_volume_displace.cc
@@ -200,9 +200,8 @@ struct DisplaceGridOp {
 
   template<typename GridType> void operator()()
   {
     if constexpr (std::is_same_v<GridType, openvdb::points::PointDataGrid> ||
-                  std::is_same_v<GridType, openvdb::StringGrid> ||
                   std::is_same_v<GridType, openvdb::MaskGrid>) {
       /* We don't support displacing these grid types yet. */
       return;
     }