What Is a Good DCOF Rating? The Real History Behind the 0.50 Number
The 0.50 SCOF number traces to a 1945 lab memo on dry polish, not wet floors. Here is what a good DCOF rating means for a floor today.
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The Tile Is Not the Floor: What ANSI A326.3 Can and Cannot Tell You About a Floor in Service
Grant Davidson at IPA Laboratories has published a two-part series on DCOF and the ANSI A326.3 product use classification. Both parts are correct. Read together they draw a boundary neither part draws on its own. The classification compares products under one standardized contaminant, forecast against a building that does not exist yet, and nothing downstream checks whether the forecast held.
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DCOF vs. Pendulum Test: How ANSI A326.3 and ASTM E303 Work Together
DCOF (ANSI A326.3) and pendulum (ASTM E303) test slip resistance differently, not competitively. Here’s what each measures and why facilities use both.
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Hospital Floor Slip Resistance: One Lobby, Two Tests, Two Different Answers
A hospital lobby floor passed DCOF testing at two of three spots but failed pendulum testing at all three. Here’s what that gap means.
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The Spec Said Slip Resistant. Nobody Measured It.
Florida’s code tells you a pool deck must be slip resistant and then defines that as a textured surface. It gives you an adjective, not a number. Not measuring does not make the number go away. It means someone else picks it three years later, with a tribometer, after a fall. Here is what Florida law does to a GC and a sub when that happens.
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You Promised a Slip-Resistant Floor. Here Is What You Actually Promised.
If you write “slip resistant” on a proposal for a commercial client, you have made a performance claim about a property you probably never measured. This is what slip resistance actually is, which numbers hold up and which ones get thrown out, why polymer aggregates are not the insurance policy people think they are, and the legal doctrine that decides whether the installer gets pulled into the case.
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You Sealed It. Now You Own the Slip.
Sealing pavers can make them dangerously slippery when wet. What slip resistance really is, how sealing contractors get named in slip-and-fall lawsuits (with real cases), why polymer aggregates like Shark Grip underperform, and how a wet slip test protects you.
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Why a Greasy Floor Tests Better on the Seventh Swing Than the First
Pendulum readings rise across successive swings on contaminated floors because the slider removes the contaminant. Real ASTM E303 swing data and the ANSI A326.3 DCOF values that caught what the average missed.
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Anti-Slip Treatment for Porcelain Tiles: The Numbers Before and After
A porcelain tile, tested wet before and after an anti-slip treatment: real ASTM E303 and ANSI A326.3 numbers, not marketing claims.
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Slip Resistance of Tiles: Why You Should Test Before You Install
A tile’s published slip-resistance number is measured in a lab, not on your job site. See how DCOF and pendulum testing verify it before installation.
