ASTM C 1028 has been officially withdrawn, with no replacement, in 2014 by the ASTM. There are no plans to resurrect this poor test method for measuring wet static coefficient of friction (SCOF). The days of looking to achieve a 0.60 for level floors and a 0.80 for ramps is now officially over. Here is some information on currently valid slip test methods. The latest (2012) building code requires a 0.42 DCOF rating according to the ANSI A137.1 slip test method.
The ASTM C 1028-07 static coefficient of friction test is widely recognized to be inappropriate for assessing pedestrian safety. It can give "safe" ratings to very slippery materials. This weakness is recognized in writing by Ceramic Tile Institute of America, Tile Council of North America, and the University of Southern California Medical Center Biomechanics Department, as well as being known by forensic experts worldwide:
2. Eric Astrachan, Executive Director of Tile Council of North America, stated in his article "Updates to an American Method for Measuring Coefficient of Friction" that dynamic friction is important in assessing safety. Static coefficient of friction (measured by the ASTM C 1028) does not properly measure slip potential for flooring.
Eric Astrachan also stated in his article (above) that there are "common requests for tile with a static COF [using ASTM C 1028] of 0.6 or better (which) stems from a now outdated ADA Access Board document in which a 0.6 static COF recommendation was made. Commonly misunderstood, this document never set a requirement and has now been withdrawn. The United States Access Board subsequently published a document called "Bulletin #4: Ground and Floor Surfaces" that clears up much of the confusion about this issue and which has no [static] COF recommendation or requirement."
Other devices such as the American Slip Meter ASM 825A and the "James Machine" also assess static coefficient of friction and they are subject to the same risks and drawbacks as ASTM C 1028. These should NEVER be used to assess pedestrian safety in the wet or otherwise lubricated condition.
(This webpage was last updated in January of 2018...be careful of old information!)
This video helps explain one of the major problems with the C1028 slip resistance test and shows reliable coefficient of friction testing methods...