Selecting the Shoe's Materials
The main purpose of ESD footwear is to release the static electricity a person stores in his body through the floor's surface. Because of this, ESD footwear must be made out of the correct materials. For the shoe's sole, a semi-conductive elastic polyurethane, which ensures constant "ground" contact and provides good friction, is often used. Leather treated with a thin coat of polyurethane is usually used for the shoe's coating, yielding a durable fabric that is chemical resistant. Next, a fabric lining that is resistant to wear and stretching is used for the interior of the shoe. Lastly, a replaceable insole made of flexible, comfortable material is selected.
Constructing the Shoe
Using the appropriate measurements, a pattern for each part of the shoe is cut out of the selected materials. The shoe is then molded together around a shoe mold, using machinery in a shoe factory, to produce a completely constructed shoe fit for wear.
Testing the Shoe's Resistance Against the Floor
The most important step in making ESD footwear is to ensure that the system resistance of the floor and shoes is 750k ohm to 35M ohm as outlined by ESD Association standards. This is done by testing the shoe using a gauge that places grounded sheet metal on the floor and measures the resistance of the shoe. Once the shoe passes resistance standards, it is marketed as approved ESD footwear.