Ohm 109 108 106 105 107 1×105 Ω ≤ R ≤ 1×109 Ω (100 kiloohms to 1 gigaohm) Electrostatic discharge (ESD-)footwear in accordance with EN 61340-4-3 and EN 61340-5-1 1×10⁵ Ω ≤ R ≤ 1×108 Ω (100 kiloohms to 100 megohms) Low resistance (conductive) Volume resistance in accordance High resistance (insulating) Antistatic acc. EN ISO 20345 / EN ISO 20347 R > 1×10⁹ Ω (1 gigaohms) R < 1×10⁵ Ω (100 kiloohms) R = electrical resistance Safety Footwear Standards · Labels · ESD Perforation resistance The perforation resistance of the footwear has been measured in a laboratory using standardised nails and forces. Nails with a smaller diameter and higher static or dynamic loads increase the risk of perforation. Under these conditions, additional protective measures should be considered. Three generic types of perforation-resistant insoles are currently available for PPE footwear. These include types made of metal materials and of non-metallic materials, which must must be chosen by means of an activity-based risk assessment. All types offer protection against perforation risks, but each has different additional advantages or disadvantages, including the following: Metal (P e.g. S1 P, S3): Is less affected by the shape of the sharp object/hazard (i.e. diameter, geometry, sharpness) due to the processes used in shoe manufacturing, however, it may not be possible to cover the entire bottom of the foot. Non-metal (PS or PL or category e.g. S1 PS, S3L): May be lighter and more flexible and may cover a larger area, but perforation resistance may vary more depending on the shape of the sharp object/hazard (i.e. diameter, geometry, sharpness). In terms of the protection obtained, two types are available. Type PS may offer better protection against objects with a smaller diameter than type PL. Electrostatic Controlling unwelcome electrostatic charge is becoming an increasingly important role in industry, as more and more employees come into contact with processes, materials or objects which are sensitive to electro static charge. It is often necessary to use safety footwear as part of a system to conduct electrostatic charge in such workplaces. Independent of various measuring methods, volume resistance between 100 kiloohms (1.0×105 ohms) and 100 megaohms (1 x 108 ohms) is required to fulfil the various relevant standards (e.g. EN ISO 20345, EN 61340). All ESD-certified products in this catalogue feature the ESD symbol. These products are also suitable in accordance with the specification for conductive footwear in the German Technical Rules for Hazardous Substances (TRGS) 727 “Avoiding risks of ignition resulting from electrostatic charges.” 297
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