Antistatic vs ESD Safety Footwear: What the Markings Mean
Procurement teams, electronics buyers and safety managers use “antistatic” and “ESD” interchangeably. In safety footwear the two terms describe different resistance windows, and the difference determines whether a pair of boots protects a person, protects a component, or protects neither.
The two ratings, their resistance boundaries, and their relationship to the static-dissipative marking on ROCKROOSTER work boots are covered below.
What antistatic means
Antistatic is a requirement inside the safety-footwear standard EN ISO 20345. That standard divides footwear into three classes by contact resistance — the resistance measured between the foot and the floor through the shoe:
| Class | Contact resistance |
|---|---|
| Conductive | below 100 kΩ |
| Antistatic | 100 kΩ to 1 GΩ |
| Electrically insulating | above 1 GΩ |
A shoe is antistatic when its contact resistance sits between 100 kΩ and 1 GΩ. The purpose is personal safety: the footwear bleeds away electrostatic charge in a controlled way, so the wearer does not build up a charge that could arc to live equipment or ignite flammable vapours and dust. Every safety class from S1 upwards requires the antistatic property as a baseline.
What ESD means
ESD protection — electrostatic discharge protection — is defined in a different standard, EN 61340-5-1, which exists to protect electronic devices and components rather than people. For footwear, the ESD range is a narrowing of the antistatic range: the lower limit stays at 100 kΩ, but the upper limit tightens to 100 MΩ.
This produces the relationship that causes most of the confusion: ESD-compliant footwear is always antistatic, but antistatic footwear is not necessarily ESD-compliant. A shoe measured at 500 MΩ is antistatic and does not meet ESD; a shoe measured at 5 MΩ is both.
The reason is the target. ESD footwear must discharge fast enough to protect a sensitive circuit board or component, which demands a lower resistance ceiling than simply preventing a spark near a fuel vapour.
One relationship, one table
| Term | Standard | Contact resistance | Protects |
|---|---|---|---|
| Antistatic | EN ISO 20345 | 100 kΩ – 1 GΩ | the wearer (spark / shock) |
| ESD | EN 61340-5-1 | 100 kΩ – 100 MΩ | electronic components |
| Static dissipative (SD) | ASTM F2413 | 1 MΩ – 100 MΩ | electronic components |
The third row is where North American specification diverges. ROCKROOSTER boots sold for electronics and clean-room work carry the ASTM F2413 static-dissipative (SD) marking, whose 1 MΩ to 100 MΩ range serves the same purpose as the EN ESD rating. SD and ESD are close cousins defined by different standards bodies; both protect components, and both are deliberately conductive within controlled limits.
What SD is not
Static-dissipative footwear is often bought by mistake for electrical work, on the assumption that “anti-static” means “safe around electricity”. It does not. An SD boot is intentionally conductive — the opposite of what an electrical worker needs. For electrical hazard work the correct marking is EH, tested under ASTM F2413 at 18,000 V. The EH-versus-SD distinction is covered in the companion article on electrical hazard footwear.
Choosing the right footwear
| Working environment | Correct marking |
|---|---|
| Electronics assembly, PCB handling, clean rooms | ESD or SD |
| Flammable vapours, solvents, dust, chemical areas | Antistatic |
| Live electrical work | EH (not SD) |
| General workshop, no electrostatic requirement | Any safety class |
ROCKROOSTER static-dissipative models
The ROCKROOSTER range includes several static-dissipative work boots for electronics, laboratory and clean-room environments:
- AK227 — pull-on steel-toe, static dissipative
- AK222 — pull-on steel-toe, static dissipative
- AK050 — zip-sided steel-toe, static dissipative
- AK229 — pull-on steel-toe, static dissipative
- AK232 — lace-up steel-toe, static dissipative
For electrical hazard work, specify an EH-rated model such as AK669, AP611 or AP360 instead.
Why a certified shoe can still fail a site check
A boot that left the factory inside the ESD or SD range can measure out of range on site without being defective. Three factors move the resistance:
- Temperature. A boot left in a cold vehicle overnight reads a higher resistance; the material conducts less when cold.
- Moisture. A worn boot absorbs sweat, which raises conductivity and lowers resistance. A brand-new, dry boot may read higher than a broken-in one.
- Condition. Metal dust, a contaminated outsole, a worn-through insole, or a swapped aftermarket footbed all change the contact path.
Routine checks should be run on conditioned footwear under consistent conditions, and a boot should be taken out of service if the outsole or insole has been modified.
Getting the right specification
Selecting footwear by a single word invites error, because “antistatic”, “ESD” and “static-dissipative” are three ratings with three different resistance windows. Match the marking to the hazard — the wearer, the component, or neither — and confirm the standard each marking refers to.
Contact our sales team for the certification documents and resistance data for any ROCKROOSTER model, or browse the work-boot range to compare models.