“…In our earlier study, the coatings generated from the same matrix (MPTMS and Zr n P) yielded a pencil scratch hardness of H when deposited on polymethylmethacrylate (a plastic substrate such as ABS) after testing as per ASTM D3363-05. 38 , 39 This is three orders of magnitude higher than that of the bare poly(methyl methacrylate) substrate, which exhibited a pencil scratch hardness of B. The abrasion resistance of the coated substrate was found to improve by more than 50% compared to uncoated substrate.…”