Two numbers frame the whole comparison: EN ISO 20345 demands a toe cap that absorbs 200 J of impact, while ASTM F2413 specifies 75 ft·lbf, roughly 101.7 J [S1][S3]. Every other divergence between the two systems (compression load, electrical-hazard philosophy, slip rating, labeling) is downstream of those two test energies and the rig geometry used to deliver them [S3].
EN ISO 20345 is the European safety-footwear standard (a 2011 re-issue of the old EN 345), mandated for sale in the EU and EEA via CE marking under the EU PPE Regulation (EU) 2016/425 [S3]. ASTM F2413 is the U.S. and Canadian performance standard, currently at the F2413-24 edition, which replaced F2413-18 in June 2024 [S5]. Compliance with one does not automatically deliver compliance with the other, and most multinational PPE programs now run both label families in parallel [S1][S6].
Impact and compression: the two numbers that drive everything
EN ISO 20345 sets a 200 J impact requirement for the toe cap, with a 15,000 N (≈3,372 lbf) compression load on the same test rig [S3]. ASTM F2413 specifies 75 ft·lbf impact (≈101.7 J) at the toe and 2,500 lbf (≈11,120 N) compression, delivered through the ASTM F2412 test apparatus instead of the European rig [S3]. The European system therefore demands a toe cap that absorbs roughly twice the impact energy and resists roughly 35% more compression load than the ASTM baseline [S3].
In practical terms, an EN ISO 20345 SB boot is not mechanically equivalent to a "basic" ASTM F2413 I/75 C/75 boot. A 200 J-rated European cap is over-specified for a North American site that only requires I/75, and a 101.7 J ASTM cap cannot legally be sold in the EU under the 20345 SB class without re-test on the European rig [S1][S3]. Buyers writing a global spec need to call out the higher of the two, not the lower, to avoid a region-by-region re-spec.
Rating system: class codes vs alphanumeric suffix codes
EN ISO 20345 expresses protection as a class hierarchy: SB (basic toe only), S1 (SB plus closed heel, antistatic, energy-absorbing heel), S2 (S1 plus water-resistant upper), S3 (S2 plus penetration-resistant midsole plus cleated outsole), plus parallel codes S1P (S1 plus midsole, the most common indoor-industrial grade) and S3S (S3 in a sneaker silhouette) [S1][S3]. Additional letters are appended for properties like HRO (heat-resistant outsole), HI (heat insulation), CI (cold insulation), WRU (water-resistant upper), M (metatarsal), E (heel energy absorption) and P (penetration-resistant midsole) [S3].
ASTM F2413 instead uses a single base rating (the F2413-24 or F2413-18 designation) and layers on a fixed set of suffix codes: I/75 (impact at 75 ft·lbf), C/75 (compression at 2,500 lbf), EH (electrical hazard), SD (static dissipative), PR (puncture resistant), Mt (metatarsal), Cd (conductive), and the newer SR / SRO slip-resistance markings [S1][S5]. A typical North-American construction boot reads "ASTM F2413-18 I/75 C/75 EH PR", and the -24 edition has tightened the way those suffixes are tested rather than re-defining each hazard class [S5].
Slip resistance is the cleanest example of the philosophy gap. EN ISO 20345 mandates a formal SRA / SRB / SRC grading on the outsole, with SRC being the combined SRA + SRB result [S1]. ASTM F2413 historically did not include a slip rating in the main standard; the SR / SRO codes were added under F2413-24 to close that gap, but most U.S. boots are still sold and worn without a slip suffix [S1][S5].
Electrical hazard: the F2413 insulator requirement
The single most-cited mechanical difference is the electrical-hazard rule. An ASTM F2413 EH boot must have an outsole that is "completely insulated" for electric shock, meaning no metallic thru-sole or exposed conductive path that would create a ground route under the foot [S2]. The mark is aimed at secondary protection in environments where the worker is not deliberately contacting live conductors, and it pairs with OSHA 29 CFR 1910.136 in the U.S. [S4][S5].
EN ISO 20345 handles electricity differently. Antistatic and ESD-rated footwear are separate classes with their own resistance bands, and there is no single "EH" equivalent built into the standard. Buyers who need ASTM-style electrical isolation on a European-style boot typically combine an EN ISO 20345 class with an independent dielectric outsole test or vendor certification, rather than reading it off the SB/S1/S2/S3 code itself [S1][S3]. On a global spec sheet this is the rule that gets re-quoted most often, and it is the easiest place to mis-spec.
Slip, puncture and the use-case match-up
For indoor light-industrial and electronics work, EN ISO 20345 S1P (200 J toe, antistatic, closed heel, energy-absorbing heel, Kevlar or steel midsole) is the most common European grade and lines up roughly with ASTM F2413 I/75 C/75 SD PR for an American site [S3][S6]. For outdoor construction, EN ISO 20345 S3 adds water resistance and a cleated outsole, and corresponds to an ASTM F2413 I/75 C/75 EH PR boot with the F2413-24 SR slip suffix where the site requires it [S3][S5].
For global procurement, EN ISO 20345 S3 SR is generally a higher all-round protection level than ASTM F2413 I/75 C/75 PR, because the European impact energy, water-resistance requirement and formal slip grade are all mandated at the same time, whereas the ASTM rating is built up one suffix at a time and slip is optional [S6]. Anyone writing a global spec for construction or oil and gas should anchor on the European S3 SR or S3 requirement and then verify the equivalent ASTM suffixes, not the other way around [S6].
Labeling, certification and what to check on a real boot
In the EU, an EN ISO 20345 boot must also carry the CE mark, demonstrating conformity with the EU PPE Regulation (EU) 2016/425, and the relevant class and additional letters must be stamped or printed on the boot itself [S3]. Post-Brexit, the UK has introduced the UKCA marking for Great Britain, while Northern Ireland continues to accept CE under the Windsor Framework, so a UK-bound order may need either CE or UKCA depending on the end-customer location [S3].
In North America, an ASTM F2413 boot must show the standard edition, gender (M/F), and the relevant suffix codes on the label or tongue stamp; F2413-24 superseded F2413-18 in June 2024, and the new edition tightens how SD, SR, and SRO are tested rather than re-defining I/75 or C/75 [S5]. OSHA 29 CFR 1910.136 sets the U.S. employer baseline for foot protection but does not pick a standard, leaving F2413 as the de facto compliance target [S4][S5]. For global PPE audits, the cross-check that matters is the suffix list, not just the headline standard number, and the same logic shows up in related anti-static decisions like the personnel grounding vs equipment grounding trade-off that drives SD-class footwear selection.
Decision matrix: which standard, for which buyer
If the end-user is in the EU or EEA, EN ISO 20345 with a CE mark is mandatory for sale and is the only label a European safety officer needs to read [S3]. If the end-user is in the U.S. or Canada, ASTM F2413-24 (or the still-legal F2413-18 inventory) is the required performance reference, with OSHA 1910.136 as the regulatory hook [S4][S5]. For a multinational with sites in both regions, specify the higher of the two impact and compression thresholds, require both labels on the same boot, and confirm slip and electrical properties suffix by suffix rather than assuming class equivalence [S1][S3][S6].
Two failure modes to flag explicitly: do not assume an "SB" boot is equivalent to a "75 ft·lbf" boot, because the 200 J vs 101.7 J impact gap is real and traceable [S1][S3]; and do not assume a CE-marked European boot automatically satisfies an EH requirement on a U.S. jobsite, because the European standard does not mandate the fully-insulated outsole that defines ASTM F2413 EH [S2]. On a typical 2026 global procurement sheet, the verified items are: F2413-24 or F2413-18 stamp with the right suffix string, EN ISO 20345 class with all additional letters (WRU, HRO, P, SR, etc.), CE or UKCA mark, and a slip grade that is documented in the same format on both label families [S3][S5][S6].
Track these signals next: the F2413-24 edition is the active U.S. reference as of August 2026, with the next scheduled review window opening January 2027 [S5]; EU-side, EN ISO 20345 remains the cited European standard with the EU PPE Regulation (EU) 2016/425 as the conformity hook, and any change would propagate through CE marking rather than through the 20345 revision alone [S3].
For component-level specifications, see fire safety, machine safety, and safety barrier.