What Is the Electrical Resistance Range for Antistatic Safety Shoes?

Static electricity killed a worker in a petrochemical plant¹. The shoes were labeled "antistatic." But nobody checked the resistance range — and that one number made all the difference.

Antistatic safety shoes must fall within a resistance range of 100 kΩ to 1,000 MΩ under EN ISO 20345². Below 100 kΩ, the shoe becomes conductive and dangerous near live current. Above 1,000 MΩ, static charge cannot escape, creating spark risk in flammable environments.

The "antistatic" label is one of the most misunderstood terms in the safety footwear industry. I have had the same clarifying conversation at least a dozen times in the past two years alone. Buyers come to me with a label. I come back with a question. And that question — every single time — changes what they actually order. If you are sourcing safety footwear for industrial use, this article will walk you through what the numbers mean, how the categories differ, and why the workplace environment always has the final say.

What Is ESD Rated Footwear?

Most buyers assume ESD and antistatic mean the same thing. They do not. Confusing the two can shut down an entire electronics production line — or worse, damage equipment worth far more than the shoes themselves.

ESD-rated footwear is designed to protect sensitive electronic components from electrostatic discharge. Under IEC 61340-5-1, ESD shoes must measure below 35 MΩ when tested as part of a complete person-plus-shoe system³. This is a tighter, lower-resistance requirement than standard antistatic footwear.

A few years ago, an electronics factory buyer came to me after a frustrating experience with another supplier. He had ordered antistatic shoes for his PCB assembly line. His quality team failed them on arrival. The shoes carried a valid EN ISO 20345 antistatic certification — resistance between 100 kΩ and 1,000 MΩ — but his ESD-controlled workstations required footwear below 35 MΩ under IEC 61340-5-1. Both products could legally be called "antistatic." But they were built for completely different problems.

Why ESD Footwear Requires Its Own Standard

ESD-controlled environments are built around one goal: keeping electrostatic discharge below the threshold that damages microchips and circuit boards⁴. A human body walking across a floor can carry thousands of volts of static charge⁵. ESD footwear works as part of a grounded system — shoes, flooring, and wrist straps all working together — to drain that charge continuously and safely.

The key difference is not just the number. It is the test method. ESD standards measure the entire person-shoe-floor system. Antistatic standards measure the shoe alone. A shoe that passes one test will not automatically pass the other. When I work with electronics industry buyers, I always ask for the floor resistance spec and the full system requirement before recommending a product. Matching the shoe to the floor is as important as matching the shoe to the foot.

Are Electrical Hazard Shoes the Same as ESD Shoes?

This is the single most dangerous mix-up I see in this industry. I encounter it three or four times a year, and every time, the consequences could have been severe.

Electrical hazard (EH) shoes and ESD shoes are opposites. EH shoes insulate the wearer from electrical ground, with resistance above 1 MΩ, tested at up to 18,000 volts. ESD shoes conduct static charge away from the body. Wearing EH shoes in an ESD environment leaves charge trapped. Wearing ESD shoes near live current removes the insulation protecting the wearer.

Last year, a buyer from a Middle East distributor contacted me. He needed antistatic shoes for a petrochemical plant. I asked him one question: are your workers near live electrical panels, or near flammable gas? He went quiet. He did not know. That one question probably prevented a serious incident — because the answer determines whether you need a shoe that conducts or a shoe that insulates. Those are opposite products.

The Physics Behind EH vs. ESD

EH shoes are built to break the circuit between the wearer and the ground. If a worker accidentally contacts a live conductor, the shoe’s high resistance slows or stops current from flowing through the body to ground. Under ASTM F2413, EH-rated footwear is tested at 18,000 volts with no more than 1 mA of current leakage⁶.

ESD shoes are built to complete a controlled circuit. They allow charge to flow from the body, through the shoe, into a grounded floor — slowly and safely. If you put EH shoes on a worker in an ESD-controlled zone, static charge has nowhere to go. It builds up. It discharges suddenly. Components fail.

I always tell buyers: before you pick a category, describe the hazard. The shoe follows the hazard. The hazard does not follow the shoe.

Are ESD and Conductive Shoes the Same?

Buyers often group ESD and conductive shoes together because both have low resistance. That grouping is wrong, and in some environments, it is genuinely dangerous.

ESD shoes and conductive shoes are not the same. Conductive shoes measure below 100 kΩ⁷ and drain static almost instantly. ESD shoes fall between 100 kΩ and 35 MΩ and drain static in a controlled, slower way. Conductive shoes are not safe near any electrical equipment. ESD shoes are not safe near live current either, but they carry significantly less risk than conductive footwear.

I once tested a batch of shoes from another supplier on behalf of a client. Fifty pairs, claimed to be antistatic. Twelve of them tested below 100 kΩ. That put them in the conductive category. The supplier had no idea. Those shoes would have passed a visual inspection. They would have failed a life-safety test. And in a flammable gas environment, they would have been a real hazard.

Understanding the Full Resistance Spectrum

The easiest way to understand these categories is to lay them out as a single spectrum, from lowest to highest resistance.

Conductive shoes sit at the far low end. They drain charge so fast that any accidental contact with a live source sends current straight through the wearer. They have legitimate uses — certain explosive dust environments where very rapid static dissipation is required — but they are not a default choice, and they are never appropriate near electrical equipment of any kind. The difference between conductive and ESD is not just a number. It is the difference between controlled dissipation and uncontrolled conductance. I always walk clients through this spectrum before we discuss product specifications. The category comes first. The product comes second.

What Is the Standard Electrical Resistance Range for Antistatic Safety Shoes?

When clients ask me for the antistatic spec, they expect me to give them a single number. I always give them two numbers instead — and I explain why both matter equally.

Under EN ISO 20345, antistatic safety shoes must measure between 100 kΩ and 1,000 MΩ. This range is a safety corridor. The lower limit prevents the shoe from becoming conductive near live current. The upper limit ensures static charge can still escape in flammable or explosive environments.

I had a client buying for a mining operation in Australia. His spec sheet said "AS/NZS 2210⁹, antistatic." I asked him three questions: Is there diesel fuel or explosive gas nearby? Are there exposed electrical conductors? Is there sensitive electronic equipment underground? He answered yes to the first two. That immediately ruled out conductive shoes and ESD shoes, and pointed us toward antistatic footwear with resistance comfortably above 100 kΩ, combined with an electrical hazard rating. No single standard answers all three questions at once.

How Standards Set the Floor — and Workplaces Set the Ceiling

Standards define the legal minimum. The workplace assessment defines the actual requirement. Skipping the workplace assessment is where most compliance failures happen.

Here is something I tell every serious buyer that almost nobody else mentions: antistatic shoes are tested new, clean, and dry. In real use, after six months on a factory floor, the outsole compound absorbs sweat and micro-contaminants. I have seen shoes re-tested after one year that had drifted from 500 MΩ down to 80 kΩ — dangerously close to the conductive threshold. Cheaper rubber compounds lose their antistatic properties faster. This is one reason I use carbon-blended rubber outsoles¹² in our antistatic line. The resistance stability over time is measurably better. For high-stakes environments, I always recommend re-testing every six months. Most buyers have never considered this step. It is not required by most standards. But it is required by basic safety logic.

Conclusion

The resistance range for antistatic safety shoes is not just a spec — it is a safety corridor that defines who is protected and from what. Match the shoe to the hazard, not the label. At Shoegan, we build antistatic footwear engineered for real industrial environments — certified, tested, and built to last. Contact us at [email protected] or WhatsApp +8613008988018.