Slip Resistance and Safety Standards for Work Shoes

Why Slip Resistance Is a Sole Question, Not a Marketing Line

Slip resistance comes from the physical interaction between a sole's tread pattern and compound and a specific floor surface under specific conditions — dry, wet, or contaminated with oil or soap residue. A sole can perform well on one surface and poorly on another, which is exactly why standardized testing exists: it gives buyers a comparable rating rather than a supplier's unverified claim. For programs supplying hospitality, food service or light-industrial customers, treating slip resistance as a tested sole specification rather than a general description is the difference between a defensible safety claim and an unsupported one.

The Standards Buyers Most Often Encounter

In Europe, slip resistance is tested under EN ISO 13287, used within the broader EN ISO 20345 safety footwear standard family. The test rates performance on two reference surface-and-contaminant combinations, commonly labeled SRA and SRB, with SRC indicating a sole has passed both. In the United States, ASTM F2913 is the more commonly referenced method, using a whole-shoe tester rather than an isolated sample of sole material. Buyers supplying both markets from the same production run should confirm which standard a given test report actually covers rather than assuming one certificate satisfies both.

How the Testing Actually Works

Both families of test method measure the friction coefficient between the sole and a reference surface under controlled wet or contaminated conditions, rather than relying on a subjective walk-test. The reference surfaces are chosen to simulate real hazards — a glazed tile with a diluted soap solution representing a typically slick floor, and a steel surface with glycerol representing an oily or industrial-floor hazard. A rating under either method is specific to the sole compound and tread pattern tested; a different compound from the same supplier, even on a visually similar sole, has not been tested unless it was submitted separately.

Sole Material and Its Effect on Slip Performance

Leather outsoles, prized in dress footwear for flexibility, breathability and resoleability as covered in our sole material guide, are not built for slip resistance and perform poorly on wet or contaminated floors compared with rubber or TPU compounds engineered specifically for grip. Rubber and TPU soles vary widely between each other too — tread depth, pattern geometry and compound hardness all affect the real-world result, which is why a rating applies to a specific sole, not to "rubber" as a category. For any program where floor conditions are a genuine hazard, a tested rubber or TPU outsole is the appropriate choice, not a leather sole regardless of upper material.

What to Ask a Supplier Before Specifying a Slip-Sensitive Sole

Ask directly which standard and rating the proposed sole compound has been tested against, on which surfaces, and whether a current test report can be shared rather than only a verbal assurance. Ask whether the test covered the exact compound and tread being proposed for your order, since a supplier's general catalog claim may refer to a different sole than the one quoted. These questions sit alongside the broader compliance documentation requests covered in our quality and compliance guide, and a supplier that answers them precisely is a stronger signal than one that answers only with a general assurance.

General reference overview; specific test scope, surfaces and pass criteria should be confirmed against the current published standard and the test report for the exact sole in question.

FAQ

Common questions on slip resistance standards