Floor Slip Resistance Testing Services

Certified Coefficient of Friction (COF) Testing for Roads and Floors, in the Laboratory and the Field

Safety Direct America provides laboratory and field floor slip resistance testing and road skid resistance testing services all over the USA and beyond. Our flooring slip coefficient testing expertise is unmatched in the Americas. We provide specialized, certified, engineer-stamped floor, tile, and roadway dynamic coefficient of friction testing (DCOF rating), ASTM E303-22 road skid resistance and floor slip resistance testing, SCOF tile testing (ASTM C1028 and ANSI B101.1 – reliable in dry condition only), and we also sell floor slip test instruments (such as the BOT-3000E and pendulum DCOF tester). Quick DCOF tile rating turn-around in 2-3 days! We’re the tile slip coefficient testing experts! Get a COF tile rating before installation and eliminate slips. Call or email John at 949-933-6971 to request a quote for field testing, or with any questions regarding slip resistance test standards

Lab Slip Resistance Testing Services

Recommended Floor Slip Resistance Test Package

ANSI A326.3 and an ASTM E303-22 Pendulum DCOF slip test: $387.00 per sample. This lab slip resistance test package will give you two separate DCOF test reports – one for the latest test method written for the BOT-3000E (ANSI A326.3), which sets a very low bar, and another for the latest American floor slip resistance test (the newly revised ASTM E303-22 pendulum test), which we recommend the most for assessing the real-world safety of floors based on 50 years of peer-reviewed, international research in at least 50 nations.

Recommended Floor Slip Test Package PLUS Wear Test

OR, get the above tests PLUS our Sustainable Slip Resistance (wear) Test, which will give an indication of the slip resistance of your flooring after 1-2 years of use in a busy environment with lots of foot traffic. This is our most highly recommended option. $457.00 per sample.

Floor Slip Resistance (COF) Lab Test
Charge per Sample
Why do this test?
ASTM E 303-22 Floor Slip Resistance Test or Road Skid Resistance Test $230 Best slip resistance test for measuring real-world DCOF of floors or the skid resistance of roads. Newly-revised in 2022. Safety criteria based on 50 years of international research.
ANSI A326.3 DCOF Rating Test or ANSI A137.1 (aka “DCOF AcuTest”) $200 Specified in 2012 International Building Code. Uses BOT-3000E Tribometer. For “comparing surfaces”, not assessing slip risk. Requires a 0.42 minimum “passing” DCOF for indoor level floors. Latest version gives minimums for other areas too.
Pendulum DCOF Test (HB 198, AS 4586,  AS 4663, EN 13036-4, BS EN 16165, BS 7976, etc.) $230 Pendulum slip resistance testing using international standards such as the European pendulum test method, Australian test, etc. The most widely used slip resistance tests worldwide. Based on 50 years of real-world research in 50 nations
Sustainable Slip Resistance Pendulum DCOF Test $320 Check whether slip resistance survives after significant wear by pedestrians and maintenance. For areas with high pedestrian traffic that must sustain its slip resistance over time.
ANSI B101.3 DCOF Test $200 An expired U.S. standard using the BOT-3000E tribometer, mostly indoors. Use A326.3 instead. Pendulum is much better for assessing safety because of decades of research behind it.
ASTM C 1028-07 SCOF Test $290 Some specifiers still require it. Superseded by TCNA’s latest test above – ANSI A326.3. Obsolete, misleading test withdrawn by ASTM in 2014. Not valid for assessing safety.
ANSI B101.1 SCOF Test $200 If required by specifier. Not a valid test for pedestrian safety, because it’s a static (SCOF) test. This is an expired test that can be helpful for dry areas only. Not for wet tests!
SlipAlert DCOF Test On-site only Qualitative demonstration that in most cases mimics pendulum readings. A simple, durable machine is used that requires minimal training.
Tortus Floor Friction Digital Tribometer DCOF Test $230 Dry and wet slip resistance up to high values of coefficient of friction with hard or soft rubber. Endorsed by Ceramic Tile Institute of America since 2001. In Australian slip test standard.
Pay now for a Floor Slip Resistance (Coefficient of Friction) Test and then send in your samples:
Pay for slip resistance test
If you also need to pay for a lab slip resistance test “rush fee” (an additional $75 per test for results in one business day), or if you need to pay for some field slip resistance testing at your location, or any other amount given to you by us for our services, you can enter the custom amount below and click on the yellow button to pay any amount necessary. Be sure to tell us what you’re paying for via email.
Amount: USD
If you’re sending a check, make it out to Sotter Engineering or Safety Direct America. Send your flooring or road samples for a slip resistance test, and your information (e-mail address, company name, name of the test sample, etc.), to:
Safety Direct America
c/o John C Sotter
26705 Loma Verde, Mission Viejo, CA 92691
Phone: 1(949)582-0889    E-mail: info@SafetyDirectAmerica.com
Contact Us

Field Slip Resistance Testing of Floors and Roadway Surfaces

To have slip resistance testing for dynamic coefficient of friction (DCOF rating) at your location, the charge will be based on time and expenses, or may be a fixed price, depending on the situation. We are certified by the City of Los Angeles (one of the few government agencies in the USA that has an approval process) for testing slip resistance of floors and roads, and slip resistance test reports come stamped by a registered professional engineer, usually within 3 business days of receiving your lab sample for slip testing. For more info, contact us by email or call (949)933-6971. Payment for field slip resistance testing (if we’ve already given you the price) can be paid for using the YELLOW “Pay Now” button above.

Sample Size Required For Slip Resistance Tests

Ideally, you will send a floor, tub or roadway sample 12″x12″ for slip resistance testing, but most slip tests can be done on smaller samples (for instance, a minimum of 5″x7″ for pendulum slip resistance tests, although bigger is better). Some test methods (ANSI A326.3, ASTM C1028-07) ask for three identical samples, but all tests can be done on one sample, if necessary. All tests above are done in the wet and the dry condition, except A326.3,  A1371.1, and B101.3…those test methods only call for wet testing (although we can do dry ANSI A326.3 dry testing for an extra $50 – pay using yellow “Pay Now” button above.) Here are some sample test reports: ASTM E303 Pendulum Slip Resistance Test Report, ANSI A137.1/A326.3, and Sustainable Slip Resistance (SSR) Pendulum Test. Using decades of research from around the world, we can now use ASTM E303-22 pendulum test results to assess real-world slip resistance using the safety criteria used in the United Kingdom, Europe, Australia, New Zealand, and elsewhere.

Floor Slip Resistance Testing Experts

Rush Fee and Other Common Slip Resistance Test Questions

RUSH/EXPEDITE: If you need your floor slip resistance tests expedited, we can usually get your flooring or roadway surface tested and a report sent to you within one business day (with rare exceptions) of receiving your sample for an extra $75 (expediting fee per test). Pay that fee here by entering “75” (per test) above the yellow “Pay Now” button. Contact us by email to make sure that we’ll be able to handle your request.

If MULTIPLE TESTS are ordered on one sample at the same time, a 10% discount applies to the test total charge. If ten or more tests are ordered and paid for in the same calendar year, every tenth test will be at no charge. TURNAROUND TIME for laboratory slip resistance tests is usually around 3 business days. Test samples are stored for 21 days before being discarded. If you’d like YOUR slip resistance test SAMPLES RETURNED, please let us know promptly. There is minimum of a $25 fee (plus the cost of shipping if you don’t have an account number we can use) for the return of a sample. This charge could be more based on individual circumstances. Preferably, you can include a return shipping label with your shipment to us, which will help keep this charge low.




We have field slip resistance testing clients from Bermuda to Japan to Guam, Mexico to Canada, New York City to Seattle, and throughout the entire USA. We offer not only a one-time field slip resistance tests, but the option of periodic slip resistance monitoring (quarterly, annually, etc.) of the coefficient of friction of your floors. Periodic slip resistance testing (or traction auditing) of your floor’s slip-resistance has many potentially multi-million dollar cost-saving benefits for building owners and safety mangers. We can test dry only for areas that stay dry in use; and dry and wet for areas that get wet in use. (We can also help you if you’d like to buy your own slip resistance test instrument.) Here’s more detail on our slip resistance testing.

Testing Floors for an R Rating using DIN 51130

Some clients are looking for an “R Rating” for their flooring. That involves the German Ramp Test, or DIN 51130, which is where a human subject wearing “work boots” (and who is attached to a safety harness) walks up and down a ramp with a a particular flooring sample on it, and the floor is covered in motor oil. The angle of the ramp is increased steadily until the subject slips, and then the angle at which the ramp was when the slip occurred is converted into an “R Rating” for the flooring. R9, R10, R11, R12, and R13 are the available classifications, R9 being the most slippery flooring, and R13 being reserved for flooring with very low slip potential. The test is a very expensive test that can only be done in a lab (usually in Germany or Australia), and it isn’t testing typical pedestrian conditions like the British Pendulum Tester. Here is more discussion on the German Ramp Test for Floor Slip Resistance, which includes some research that has been done comparing pendulum test values to German Ramp Test DIN 51130 values.
The pendulum test is easily the world’s most reliable test for assessing the slip resistance of floors, as it can test for the dynamic coefficient of friction (or slip resistance) both in the lab and after the flooring has been installed and maintained, which is often crucial to avoiding slips on your property. It’s based on 50 years of research around the world, and uses distilled water as the lubricant, which mimics real-world conditions much better than the ramp test. The DIN 51130 German Ramp test can only tell you how slip resistant a floor is when you first pull a tile out of the box, and how slippery it is to someone wearing work boots on a floor covered in motor oil.

Send your flooring samples for slip resistance testing to:

Sotter Engineering
c/o John C Sotter
26705 Loma Verde, Mission Viejo, CA 92691