The Cooper-Wessex Accelerated Polishing Machine CRT-APM is the industry standard device for the determination of the Polished Stone Value (PSV)
Wessex Engineering first manufactured an Accelerated Polishing Machine, CRT-APM over 30 years ago, and were involved both in the development of the machine and the test procedures. Wessex has sold more than 1000 APMs globally.
In 1950 increased traffic flow and higher speeds, together with concerns about road safety led to research into the relationship between road materials and skid-resistance. Research at the UK Transport Road Research Laboratory showed a significant relationship between polishing of aggregates used in road surfaces and skid resistance. Tests were devised using an Accelerated Polishing Machine and a friction measuring device(known as the Pendulum, also supplied by Cooper-Wessex), to determine a Polished Stone Value(PSV).
As the best quality market leaders Cooper-Wessex have recently been copied by low quality manufacturers. Imitators’ machines may look similar, but precision, repeatability and reproducibility come only with years of experience.
Calibration, Annual Service and Maintenance Contracts are available for this device.
Please enquire for further details. Note: This device should be checked annually.