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Why use ESD Socks

The benefits and considerations of using ESD (electrostatic discharge) flooring and footwear as an effective method to ground personnel and control electrostatic discharges, particularly when using a wrist strap is not practical.

To ensure the effectiveness of this system, it is crucial that both the ESD flooring and footwear have a low enough resistance to allow the voltage from the operator to flow to the ground. Additionally, there must be a good contact between the person and the ESD footwear.

While ESD shoes may be made with conductive materials, they require a layer of perspiration in the sock to provide a path-to-ground. This requirement poses a concern because it introduces variability, as there are many factors that can differ from person to person. According to the ESD Handbook TR20.20 section 5.3.3.5 Common Testing Problems, "Occasionally, footwear may indicate a high resistance...[with a contributor being] heavy or insulative socks, or the absence of a sweat layer due to differences in temperature between the inner surfaces of the shoes and the wearer’s feet."

Therefore, it is important to note that resistance measurements may vary inconsistently from person to person, especially during colder months when employees wear heavier socks and perspire less. It is possible for a person to fail an initial test at the start of a shift, and pass the same test ten minutes later after a sweat layer is formed.

Considering these factors, it is essential to ensure proper training and awareness among employees using ESD flooring and footwear. It is also recommended to monitor and address any inconsistencies or issues that may arise due to variations in resistance measurements.

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