Molecular solids are held together in single chains of bonds using either LDF forces or dipole-dipole forces. These are weaker bonds than network covalent because instead of single bonds, network covalent solids (such as sand, graphite and diamond) form webs of bonds that interlock with one another. Solution Molecular solids are held together in single chains of bonds using either LDF forces or dipole-dipole forces. These are weaker bonds than network covalent because instead of single bonds, network covalent solids (such as sand, graphite and diamond) form webs of bonds that interlock with one another..