ASTM F2413 Explained: What the Label Inside Your Boot Certifies

Reading the label

The marking is three or four lines, stitched or printed inside the boot:

• Line 1 — the standard designation and year, for example ASTM F2413-18.
• Line 2 — gender (M or F) followed by the mandatory I and C designations for impact and compression.
• Lines 3 and 4 — the optional protections the boot has been certified for.

A boot marked ASTM F2413-18 M I/C EH is a men's boot meeting the current impact and compression requirements with electrical hazard protection. A boot marked ASTM F2413-18 M I/75 C/75 EH from an earlier print run means the same thing.

Why the numbers disappeared

Older labels carried a numeric suffix — I/75, C/75, and a lower Class 50 tier. The 2018 edition removed the Class 50 tier entirely, making 75 foot-pounds of impact and 2,500 pounds of compression the only level the standard recognizes. With nothing left to distinguish, the suffix became redundant and was dropped. The protection did not change; only the notation did.

This is why a boot marked I/C is not weaker than one marked I/75 C/75. If anyone tells you otherwise, they are reading a 2005-era label convention onto a modern boot.

The two mandatory designations

The clearance requirement is the part worth knowing. It is the direct answer to the old story about safety caps severing toes: the standard specifically tests that the cap holds a gap open above the foot under full compression load.

The optional designations

How OSHA uses the standard

OSHA does not certify boots. 29 CFR 1910.136(a) puts the duty on the employer: they must ensure each affected employee uses protective footwear where there is a danger of foot injuries from falling or rolling objects, objects piercing the sole, or an electrical hazard.

1910.136(b) then says what counts as compliant footwear, and incorporates three consensus standards by reference: ASTM F-2412-2005 and F-2413-2005, ANSI Z41-1999, and ANSI Z41-1991. It also allows footwear the employer can demonstrate is at least as effective as one of those.

Two consequences follow. First, “OSHA-approved boots” is not a thing — OSHA approves no footwear, it accepts standards. Second, which optional codes you need is decided by your employer's hazard assessment, not by the boot. If the assessment identifies an instep-impact hazard, the employer can require Mt-rated footwear, and your preference does not enter into it.

What the standard does not protect you from

This is the section most explainers skip, and it is the most useful one.

• Anything above the toe cap and outside the guard. The sides of your foot, your ankle and your lower leg are protected by leather and nothing else unless you buy height.
• Slipping. Slip resistance is a separate standard — ASTM F3445 — with its own designation. A boot can be fully F2413 rated and have no slip rating at all.
• Water, cold and heat. None of them appear in F2413. A steel cap tells you nothing about whether the boot keeps water out.
• Fatigue and long-term musculoskeletal load. The standard measures a single catastrophic event. The thing most likely to actually hurt you over a career is standing on concrete for thirty years, and no ASTM code addresses it.
• A boot that no longer performs. The rating describes the boot as manufactured. A worn outsole is a compromised EH rating, and a cap that has taken a serious hit should be retired.