Anti-Static Flooring Part Four
SPECIFICATION AND STANDARDS
The rate at which electrostatic charge is dispersed within and through the floor finish is controlled by the resistance, measured in the unit Ohms (Ω), usually expressed in thousands (Kilo-ohms or KΩ) or millions (Mega-ohms MΩ) and denoted by units expressed as a figure of ten with indices, i.e.103 for 1KΩ or 106 for 1MΩ. Greater values of resistance suggest a slower passage of electrostatic charge and the decay of voltage measured.
Resistance may be measured in one or more of four ways:
(a) between two points at a pre-defined distance on the surface of the cured resin floor finish
(b) between the surface and the underside of the resin finish (the substrate)
(c) earth leakage of the whole system, between the surface of the resin finish and via the substrate to a point defined as electrical earth
(d) a combined body voltage test where the charge level generated and its decay rate on a person walking the floor is measured using specialist equipment to identify the interaction between floor and specialist footwear.
It is not uncommon for those operating facilities which demand static controlled flooring to be unsure of their exact numerical requirements, when expressed in the terms above.