Silanes are silicon based compounds used for the treatment of various surfaces. Because of their specific structure they can react with inorganic substrates or between themselves. By the reactions of hydrolysis and condensation silanes bind to the treated surface. Silane coupling agents allow the modification of hydrophobic or hydrophilic properties of surfaces. Hydrophilicity is determined by measuring the contact angle of water droplets on the substrate surface, if the contact angle (θ) is greater than 90° the surface is hydrophobic, but if it is smaller than 90° the surface is hydrophilic. Silane coupling agents are used for many applications, but their base role is to improve the properties of the end product. The aim of this study was to investigate the influence of certain silanes on the surface properties of glass and polymers. Samples of glass, PE-HD, PE-LD, PLA, ABS were dipped in Evonik silanes Dynasylan SIVO 121, Dynasylan SIVO 160, Dynasylan SIVO 214, Dynasylan SIVO CLEAR K2, Dynasylan DAMO, Dynasylan 40, Dynasylan 6598, Dynasylan 6490, Dynasylan 6498 and their surface properties were modified. Contact angles were measured on the prepared samples. After completing the experiment, it was concluded that by using this silanes surface properties of glass and polymers can be modified.