What Does SRA, SRB, and SRC Mean on Safety Shoes?

Three workers slipped in the same month. All three wore EN ISO 20345¹ certified shoes. Nobody told the buyer those shoes were only SRA rated.

SRA, SRB, and SRC are slip resistance ratings under EN ISO 20345. SRA means the shoe was tested on wet ceramic tile. SRB means it was tested on oily steel. SRC means it passed both tests. A higher letter does not replace the lower one — SRC is the only rating that covers both surfaces.

That one letter difference — SRA versus SRC — cost a distributor in the Middle East three injury reports and a contract review. I’ve been in this industry for over 20 years, and I’ve seen this exact pattern more than once. Most buyers assume that \"EN ISO 20345 certified\" covers everything. It doesn’t. The slip resistance rating is a separate part of that standard, and it matters more than most people realize before something goes wrong.

What Is the Difference Between SRA, SRB, and SRC in Safety Footwear?

You’re comparing shoes with different slip ratings, but the spec sheet doesn’t explain what those letters actually test. That’s where the problem starts.

SRA tests the outsole on wet ceramic tile with a diluted soap solution², requiring a minimum coefficient of friction of 0.32³. SRB tests on oily steel, requiring 0.18⁴. SRC means the shoe passed both. Each test simulates a different real-world surface condition. They are not interchangeable.

The distributor I mentioned earlier had workers on metal grating in an oily environment. His shoes were SRA rated. SRA is never tested on that kind of surface. The shoe had a legitimate certification — it just wasn’t the right certification for that job site.

Here is a direct comparison of the three ratings:

The friction numbers look simple, but the surface conditions they simulate are very different. A shoe that scores well on wet tile can still be completely wrong for an oily steel grating. That’s the gap that causes accidents.

What makes this worse is that most product listings only show the overall EN ISO 20345 certification. The slip rating is buried in the technical datasheet, if it’s listed at all. As a manufacturer, we print the full rating on the shoe label and include it in every product spec we send to distributors. It’s a small step, but it removes a real source of confusion.

One more point worth knowing: the SRC rating is the only one that gives you full coverage across both tested conditions. If you are sourcing for a site where surface conditions vary — which is most industrial sites — SRC should be your baseline requirement, not an upgrade.

What Does SRC Mean on Safety Shoes?

Buyers often see SRC on a label and assume it’s a general quality mark. It’s not. It’s a specific test result, and it tells you something exact.

SRC on a safety shoe means the outsole passed both the SRA test (wet ceramic tile) and the SRB test (oily steel plate) under EN ISO 20345. It is the highest slip resistance classification in the European standard. A shoe marked SRC has been tested and confirmed to perform on both surface types.

Getting SRC on the label is straightforward — you submit the shoe to an accredited lab and it either passes both tests or it doesn’t. What’s harder is making sure the shoe still performs like an SRC-rated shoe after six months of real use.

This is where most slip resistance failures actually happen⁶. Not on day one. Not during certification. They happen at the four to six month mark, when the outsole tread wears flat and the rubber compound loses its surface grip. A shoe can pass SRC when it’s brand new and become a slip hazard within a single season of heavy use.

Why Long-Term Slip Resistance Is the Real Test

At Shoegan, we run wear simulation tests that are equivalent to roughly 500 hours of use before we approve an outsole compound for any new model. We have rejected three outsole suppliers in the past two years. Their materials passed the initial SRC test. They did not hold up under our simulation.

Here is what we look at during outsole evaluation:

That process adds cost. It also means our clients don’t come back to us with field complaints. The SRC rating on our label reflects what the shoe does on day one and what it still does six months later.

What Is the SB SRA Safety Rating?

A buyer once sent me a spec sheet that listed \"SB SRA\" as the required standard. He thought it was a single combined safety grade — like a score out of ten.

SB and SRA are not the same type of rating. SB is a basic safety classification that requires a 200-joule impact-resistant toe cap⁸. SRA is a slip resistance rating based on outsole performance on wet ceramic tile. They answer two different questions and are tested in completely separate parts of the EN ISO 20345 standard.

After I explained the difference to that buyer, he added SRB to his spec. He changed his order. That one conversation probably prevented a workplace incident on his client’s site.

SB vs S1, S2, S3 — and Where SRA Fits In

The \"S\" classification (SB, S1, S2, S3) describes the protective features built into the shoe. The slip rating (SRA, SRB, SRC) describes how the outsole performs on specific surfaces. These two systems run in parallel. You can have an S3 shoe with SRA, SRB, or SRC. The slip rating is always stated separately.

Here is how the S classifications build on each other:

SB is the floor. S3 is the most complete option for general industrial use. The slip rating you choose — SRA, SRB, or SRC — depends on the surface conditions at the work site, and it is always an additional specification on top of the S classification.

When a buyer lists \"SB SRA\" as a requirement, what they usually mean is that they want a shoe with basic toe protection that has been slip-resistance tested. But SRA alone only covers wet tile. If the site has oily floors or metal grating, that spec is incomplete. The right question to ask is: what surfaces will these shoes actually be worn on?

What Are S3 SRC Safety Shoes?

About 60% of the serious B2B inquiries I receive from Europe and the Middle East now include S3 SRC in the spec by default¹¹. Five years ago, that number was closer to 30%.

S3 SRC safety shoes combine the S3 protection classification — which includes a water-resistant upper, 1,100N anti-penetration midsole¹², and structured outsole — with SRC slip resistance, meaning the shoe has passed both wet tile and oily steel surface tests. This combination covers the widest range of industrial hazards in a single product.

When a procurement manager tells me they need one SKU for a mixed-use industrial site, S3 SRC is almost always the answer. It’s not the most expensive option in our range. But it’s the one that causes the fewest problems after delivery.

What S3 SRC Covers — and What It Doesn’t

S3 SRC is a strong specification for most industrial environments. But it’s worth being clear about what it includes and what falls outside its scope.

S3 SRC covers the most common hazards on a general industrial site. For specialized environments — chemical plants, cold storage, high-voltage work — additional ratings are needed. At Shoegan, we manufacture shoes across all these categories, and we help procurement teams match the right spec to the actual site conditions before an order is placed.

The market is getting smarter about this. Buyers who specify S3 SRC by default are not overspending — they are reducing the chance of a mismatch between the shoe and the job site. That’s a better outcome for everyone in the supply chain.

Conclusion

SRA, SRB, and SRC are not interchangeable. Each rating tells you exactly what surface the shoe was tested on. Match the rating to the site, not just the standard. At Shoegan, every shoe we produce is built to the right spec for the right environment — contact us at [email protected] to find the correct rating for your next order.