How long can I rely upon a slip test certificate?

Test results will apply only to the surface at the time of test, and many test certificates will state this. Slip resistance will often change over time with wear, contamination and cleaning processes.
Regular assessments can highlight changes and reduce the risk of slipping incidents.
If repeated pendulum data shows significant variation consider investigating the cause of the change.
Wear characteristics of a flooring material can be assessed by use of an accelerated wear machine.