Pure and sodium chloride (NaCl)-added Triglycine sulfate (TGS) crystals were grown front aqueous solutions by slow evaporation technique. The values of concentration of dopants in the mother solution were 0.2, 0.6 and 1 mol%. The solubility of the grown samples have been found Out at various temperatures. The determination of unit cell parameters was carried out by single Crystal XRD method and found that the grown crystals crystallize in monoclinic structure. The dielectric characterization for the pure and NaCl-doped TGS crystals was performed by measuring the dielectric parameters like dielectric constant and dielectric loss with various frequencies in the range 10(2)-10(6) Hz and with the temperatures ranging from 30 to 70 degrees C and this study reveals an increase of dielectric constant and loss with the increase of NaCl concentration. Studies on mechanical properties like microhardness and density of the grown pure and NaCl-doped TGS crystals were carried out. UV-Visible transmittance Studies were carried Out for the grown samples. A sharp fall in the transmittance is observed at 228 rim for pure and NaCl-doped TGS crystals. Atomic absorption spectroscopic (AAS) study was done on the NaCl-doped TGS crystals to ascertain the presence of Na(+) ions in the lattice. (C) 2009 Elsevier B.V. All rights reserved.