6.März 2017 - The present work investigates the effect of hardness and thickness on the electrostatic charge generated from the sliding of the rubber sole against recycled rubber tiles. Based on the experimental observations, it was found that at dry, water wet, detergent wet, oil lubricated and sand contaminated sliding, voltage decreased with increasing the hardness. Voltage generated at water wet floor tiles showed relatively lower values than that observed for dry sliding. At sand contaminated sliding, soft tiles showed very high voltage values. Voltage generated significantly increased with increasing the thickness of the tested tiles. Water wet sliding showed voltage lower values than that observed for dry sliding, while detergent wet sliding showed relatively higher values than that observed for water wet sliding.