ANSI 137

American National Standards Institute

The American National Standards Institute (ANSI) has three low friction pedestrian standards for testing using the BOT 3000E digital tribometer, intended for test flooring for indoor use. Why do they have three levels, and what is the difference between them? All of them have different test methods and different minimum coefficient of friction values ​​(0.42, 0.43 and 0.60).

All three test methods are primarily used to assess the safety of deck soil to be used while wet. However, each test method uses a slightly different wetting liquid.

The first ANSI approved standard was B101.1. This is the measurement of the static coefficient of friction (SCOF) and the wetting liquid is purified water. Static friction simulates a pedestrian who is still standing, and despite the long tradition of its use in the US, it is now thoroughly discredited and practically useless for safety assessment, and should be ignored for wet testing. Despite widespread disinformation, wet static friction is not approved for safety assessment by ADA, OSHA, the International Building Code, Tile Council of North America, Ceramic Tile Institute of America, or any other related organization. significant security. Static testing in the dry condition, however, can be useful in the field to see if dust, grease, or dry soap build-up (for example) is causing problems with slip resistance.

The second standard is B101.3 ANSI. This involves measuring dynamic coefficient of friction (DCOF) using a quantity of wetting agent (sodium lauryl sulfate, or SLS, an ingredient in many detergents) in the water used for the test. The standard establishes a minimum DCOF of “greater than 0.42” for level floors. This safety criterion is derived from extensive research from Wuppertal University using human subjects walking down a variable angle ramp compared to BOT-3000E tests using the concentration of the wetting agent B101.3. BOT test results correlated well with slippage by humans, and “0.42 or higher” was considered a reasonable cut-off point for safety (or acceptably low risk of slippage).

The third and newest standard is ANSI A137.1. It was written by the Ceramic Council of North America and is now incorporated as a reference in 2012 in the International Building Code. The safety standard for ceramic tile on a flat surface is 0.42 or higher. There is a subtle difference between the last two security standards: one is “0.42 or greater”, while the other is “greater than 0.42”, that is, 0.43 or greater.

Measures the dynamic coefficient of friction (DCOF)

The standard establishes a minimum DCOF of “greater than 0.42” for level floors.


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