The Wessex pendulum skid resistance tester CRT-PENDULUM (also known as British Pendulum Tester) is the original, the most widely used, and the best portable skid resistance tester in the world.

The Wessex Pendulum Skid Resistance Tester CRT-PENDULUM is the established world leader in its field. Originally designed in the 1940s in the US, the instrument was further developed in the 1960s at the UK Transport Research Laboratory for the testing of road surfaces.

The CRT-PENDULUM PST measures the frictional resistance between a rubber slider mounted on the end of a pendulum arm and the test surface.

This provides highway engineers with a routine method of checking the resistance of wet and dry surfaces to slipping and skidding, both in the lab and on site.

It is based on the Izod principle: a pendulum rotates about a spindle attached to a vertical pillar.

At the end of the tubular arm a head of known mass is fitted with a rubber slider.

The pendulum is released from a horizontal position so that it strikes the sample surface with a constant velocity.

The distance travelled by the head after striking the sample is determined by the friction of the sample surface.

A reading of Skid Resistance is obtained


UNE 12633

BS 812 Pt. 114

BS EN 1097-8 Determination of Polished Stone Value

AS/NZS 4586:1999 Slip resistance classification of new pedestrian surface materials

BS 6077 Pt 1 Clay and calcium silicate pavers for flexible pavements.

BS 7044 Artificial sports surfaces: person/surface interaction.

BS 7188 Impact absorbing playground surfaces

BS 8204 In-situ flooring, part 3 Code of practice for polymer modified cementitious wearing surfaces.

ASTM E303 Standard Method for – Measuring Surface Frictional Properties

Using British Pendulum

BS 7976 Method of operation and calibration of the pendulum tester.

EN 1436 : 1997 Road Marking Materials BS EN 13036-4:2003 Road and

Airfield surface characteristics