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Scratch Testing with Multi-Finger 5-finger Tester

Many plastics have visco elastic properties and the stresses in the plastic may relax during loading. Plus, plastics demonstrate an elastic recovery after applied stresses are removed. For example, parameters such as scratch width, groove depth, displaced material and severity of the damage may change over time. Other issues that may affect the visual perception of scratches include the color of the sample, amount of strain whitening, scratch direction, lighting and viewing conditions, and the amount of time an observer is allowed to view the sample.


The taber multi finger scratch/mar tester also known as the 5-finger scratch tester, this instrument is used to evaluate the scratch and mar resistance of resilient materials. A variable speed, pneumatically driven sledge is moved below five independent, weighted scratch "fingers" that are equipped with interchangeable scratch tips. Includes: spline shaft 'finger' assembly (5); scratch tip with 1.0mm diameter hemisphere (set of 5); mar tip with 7.0mm diameter hemisphere (set of 5); weight set (consisting of 2N; 3N; 4.5N; 5N; 6N; 7N; 10N; 15N; and 20N); and specimen clamp.
The 'five-finger' scratch tester has been popular in the automotive industry for testing smooth or grained plastics commonly used in ornamentation or trim. Useful for quality control as well as material or product development, the Multi-Finger Scratch / Mar Tester is ideal for evaluating plastics, rigid organic materials, paints and coatings, soft metals,linoleum, plus many others.

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