Taber Shear/Scratch Tester Models 550/551
Taber 551 Shear/Scratch Tester ISO
- Model 551 (230V, 50Hz)
- Operates at a speed of 5 rpm, and includes cutting tools S-20 and 139-56.
- Meets ISO, DIN, EN and other European test standards.
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- With the TABER® Shear / Scratch Tester, you can evaluate resistance to shearing, scratching, gouging, marring, scraping and engraving on a variety of flat, rigid specimens.
- It may also be used to test the relative homogeneity of materials, the adhesive qualities of protective coatings and the effects of age on similar materials.
- Available in two models:
- Shear / Scratch Tester - Model 550 (115V, 60Hz) - operates at a speed of 0.6 rpm and includes cutting tools S-20 (10120) and 139-55 (15551).
- Shear / Scratch Tester - Model 551 (230V, 50Hz) - operates at a speed of 5 rpm, and includes cutting tools S-20(10120) and 139-56 (10026). This instrument meets ISO, DIN, EN and other European test standards.
- It is a removable scale beam mounted on a pivotal shaft that projects from an adjustable gage block. An adjusting screw permits the height of the pivotal shaft to be raised or lowered, corresponding with the thickness of a test specimen up to 12.7 mm (0.5 inches). This adjustment allows the scale beam to be maintained in a level position in respect to the specimen and turntable. Designed with an integrated bearing, the scale beam can be tilted in a rest position enabling the operator to mount or remove specimens.
- A calibrated sliding weight is mounted on the scale beam. By changing the position of the sliding weight, the load applied by the scratch tip (shear tool) can be adjusted between 0 to 500 grams. A second calibrated weight may be attached to the end of the scale beam, thus increasing the load capacity and changing the scale to 500 - 1000 grams. Engraved graduations are marked on the scale beam representing 10 grams per division.
TABER 551 Shear Scratch ISO Tester
500 Gram Calibrated Weight (2 each)
S-20 Precision Ground Tungsten Carbide Tool
ISO Diamond Tool (10026)
Measuring Magnifier
Spirit Bubble Level
Hex Wrench
Operated by an on/off switch, the motorized turntable rotates at a constant speed to ensure greater accuracy in test results. The turntable rotates in a counter-clockwise direction, but with a simple conversion the turntable rotation can be reverse.
For materials sensitive to scratching, an optional Scale Beam Modified Weight Set is available that converts the scale by 1/10 to 0 - 50 gram range. To increase the testing load from 1000 to 1500g, an optional Scale Beam Fixed Weight is available. To satisfy EN 13310 (Kitchen Sinks - Functional requirements and test methods) an optional weight that provides a 15N load is also offered.
For best results, conduct three to four tests on the specimen surface. Each test should be approximately 90° from each other (e.g. in the 12, 3, 6 and 9 o'clock positions) and at least 6mm in length. A 10x Measuring Magnifier is included with each Shear / Scratch Tester. This allows you to visually measure the width of a scratch to the nearest thousandth of an inch.
Diamond Scratch Test - The standard criterion for scratch resistance is the minimum load required to penetrate the surface of the testing material with the diamond tool. Alternatively an average scratch width can be calculated using a specified load, and results compared.
Shear Tests - The standard criterion for shear resistance is the minimum load necessary to shear the surface of the testing material with the contour shear tool with a typical width ranging between 1mm to 2.5mm. Due to the difficulty in cutting grooves of identical width, minor deviations can be compensated for by averaging the measurements.
Adhesion of Coatings - Using the TABER Shear / Scratch tester, adhesion of coatings can be rated. This is determined by recording when the tool breaks through the junction of the topcoat and the undercoat. See graphic for suggested ratings.
Diamond Tool Conical ISO
Article No: 10026
Taber 550 Shear/Scratch Tester ASTM
Article No: 10090
