Coventry swabs will dissipate 99% of a 5000V charge in less than 2.0 seconds. The static dissipative plastic alloy used to make the handles is inherently static dissipative. It contains no additives, coatings or surfactants so it functions at any level of humidity and it is very resistant to solvents even acetone. - Engineered to eliminate damage from static electricity. Choose between our Class 10 (ISO Class 4) laundered polyester or 100 pore per inch ultraclean polyurethane foam.