Types of Flooring
Static Control Floors
Static-control flooring can be defined as a flooring system that drains or dissipates static charges by grounding people, equipment or other objects that contact the floor surface, or one that controls the generation and accumulation of static charges. The resistance to the movement of electrons across the material's surfaces differentiates static-control flooring types into the following categories:
- Conductive flooring has a resistance of 2.5 x 104 to 106 ohms per 3 ft. It can drain a static charge of 5000 volts to zero in 0.05 seconds.
- Static dissipative flooring has a resistance of 106 to 109 ohm per 3 ft. It adds no static electricity to the environment and drains off a 5000 volt charge to zero in less than 0.2 seconds.
Because it has low electrical resistance, a conductive flooring material allows electrons to flow easily across its surface or through its volume. If a charged conductive floor is grounded, or coupled to another conductive object, such as a steel pipe or grounded post, the chare accumulated on the floor will be uniformly distributed and rapidly dissipated to ground. Thus, conductive flooring prevents the buildup of a static charge, which eliminated the possibility of an ESD event.
Static dissipative flooring materials have electrical resistance between insulative and conductive materials. Like conductive flooring material, the charges generated triboelectrically on the static dissipative floor can be transferred to ground, but this transferring process takes longer than that within a conductive floor.