The invention relates to layered double hydroxide (LDH) materials and in particular to new methods of preparing improved LDH materials which have intercalated active anionic compounds (improved LDH -active anion materials). The improved LDH- active anion materials are characterised by their high degree of robustness, demonstrated by their high Particle Robustness Factor values , and by their ability to retain substantially all of the intercalated active anionic compound , in the absence of ion exchange conditions and/or at pH >； 4.
