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Toothbrush Tester


3 parameters needed to be tested on a range of toothbrushes;

  • Stiffness of bristles according to ISO 8627, 1987/BS5757
  • Strength of a single bristle
  • Strength of a tuft of bristles

The equipment needed to be simple to operate for production staff, robust enough for a factory environment with extremes in temperature and offer the ability to perform all 3 tests with the minimum of 'set-up' time.


A VersaTest motorised test stand adapted with accessories and sensors was used to perform each test. According to the ISO 8627 bristle stiffness test, the toothbrush has to be mounted in a holder and rubbed against a metal grid at a speed of 200 mm/min. The grid is attached directly to a 100N S-Beam Loadcell which detects the stiffness of the bristles as they travel over it's surface. The graph of force/deflection was recorded using DataPlot-X software. Soft bristles will show a low force compared to hard bristles. A surgical clamp with serrated jaws was used to hold the bristle for the 'single bristle' pull test. Forces in the region of 10-15N were required to remove the nylon bristle from the polypropylene toothbrush head. For the 'tuft' pull test, a set of bristles were held in a pin-chuck and connected to a 200N S-Beam sensor, via a flexible chain link. Removal forces for the complete tuft were in the region of 50-70N.


  • VersaTest Motorised Test Stand (superseded by the MultiTest-dV series)
  • 100 N and 200 N Smart S-Beam
  • Pin Chuck and Chain
  • X-Y Table c/w Toothbrush Head Holder for above tests
  • Bristle Stiffness Fixture
  • 2 AFTI displays
  • Surgical Clamp and Chain
  • DataPlot-X Software
  • DigiCon Interface and Cables

Supplied to

Westone Products, UK & China

A Brand You Can Trust

"The MultiTest 0.5-i is a very good and reliable machine and the Emperor™ Software brings great advantages. It’s a very useful tool for these kinds of tests. It’s fully programmable and offers an in-depth analysis of results. It’s a precious tool for everybody involved, especially those who work with plastics and their mechanical performance"

Nikos Michopoulos, Quality Control, Eurofilm Mantzaris S.A.


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