Static dissipative are designed to drain the Electro Static charge from items placed on the mat. Mat should be grounded to be most effective. Dissipative mats are rated middle range of ESD matting and have a surface resistance of more than 1 x 10 5 ohms/square but less than 1 x10 11 ohms/square. Must of static dissipative mats have anti-fatigue properties to provide workers comfort and safety.