Through our proprietary manufacturing process, Ergo Advantage ESD tiles retain the required ESD performance through the full volume of the tile as compared to other mats that only offer "surface resistivity". Aluminum or copper tape can be used as the grounding agent when installed over a non-grounded floor. The advanced versatile interlock system allows for ease and efficiency during installation and future modifications. 100% Recycled PVC and ESD additive. Tear strength: 156-367 lbs/in. Tensile strength: 1170-1620 psi.