Slip Resistance Testing Machine


The globally recognised leading footwear slip test machine.


SATRA Slip Resistance Testing Machine STM 603

Testing against industry-accepted slip resistance standards is a proven method to validate products and demonstrate due diligence against the risk of slip.

Footwear slippage on a surface can begin in a fraction of a second, while the consequences could last for a lifetime. Broken bones, lost reputation and litigation under health and safety legislation are some of the possible outcomes. In Europe and the USA, there are now legal obligations requiring suppliers to place only safe products on the market. Other parts of the world appear to be following suit. Reducing the risk of footwear slip is a critical safety aspect to be considered.

So, what contribution does a slip test machine make to the determination of shoe slip resistance? A slip test machine can be used as a development tool to verify the slip resistance of new footwear products, or to validate production footwear against a footwear specification in which a required coefficient of friction (the ratio of the horizontal force to the vertical force as the shoe slips) has been specified. Testing against industry-accepted slip resistance standards is a proven method to validate products and to demonstrate due diligence.

SATRA has over 30 years’ research experience investigating slip between footwear and a wide range of flooring and naturally-occurring surfaces. Over this period, fundamental principles of slip have been identified, as well as the characteristics of footwear required to reduce the risks of slip. Based on this fundamental research the SATRA STM 603 Slip Resistance Testing machine has been developed (designed and manufactured by SATRA) and supplied widely to the global footwear industry for slip resistance testing.

Slip is a complex process, and an effective slip test machine needs to control and measure a number of key criteria reproducing the critical factors relating to slip when walking. The SATRA TM144 test method established a test protocol for slip testing, widely accepted within the footwear industry. It formed the basis of the subsequent European standard EN ISO 13287 and more recently the US standard ASTM F2913-11. The ISO standard and SATRA slip-testing apparatus is also referenced in the Canadian Standards Association CSA Z195-09-Protective Footwear. SATRA TM144 continues to provide a comprehensive basis for the development and approval of footwear, with respect to slip, within the shoe industry. The SATRA STM 603 machine enables testing of footwear to be conducted to SATRA TM144, EN ISO 13287 and ASTM F2913-11 test methods. Users can also programme their own slip test parameters into the machine – for example, if they have their own internal development standards.

The SATRA STM 603 Slip Resistance Testing machine accepts a wide range of ground surfaces against which footwear can be tested for its resistance to slip. It is common to test footwear against a dry floor and a wet floor (or, in the case of EN ISO 13287, a lubricated surface). The standard tests (SATRA TM144 and EN ISO 13287) specify closely controlled, calibrated standard flooring surfaces designed to give reproducible footwear slip test results.

To simulate cold weather conditions, an optional piece of SATRA equipment allows a temperature controlled block of ice to be produced and used in the STM 603 machine. Ice can occur in a number of conditions in the outside world, and three of these can be simulated using the SATRA ice block on the STM 603 machine: frozen (a rough surface produced as a result of the freezing process), frosted (condensation ice crystals which coat the surface of the ice) or smoothed (ice surface smoothed subsequent to freezing).

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