Mezibar Summary of Test Method 4. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Assurance Testing Inspection D
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The indicator should now read If it does not, loosen the lock-nut and turn the lower plunger guide in or out to obtain a reading. Next, read the hard aluminum alloy disk supplied by the manufacturer of the Impressor and, if necessary, adjust so that the reading is within the range marked on the disk. Then do the same with the soft disk.
If these readings cannot be obtained, subsequent measurements are not valid. Conditioning In cases of disagreement, the tolerances shall be 61C Test Specimens 7. Procedure Impressions should not be made within 3 mm 18in. NOTE 4Curved surfaces may be more difficult to support. When the load is applied, bending and spring action in the specimen should be avoided. Preparation and Operation of Apparatus 8. Place the Impressor and the material to be tested or the calibration disk on a solidly supported, flat, hard, firm surface such as stone, metal, or ceramic.
If softer supporting surfaces are used, a falsely low instrument reading may occur. Set the legs on the same surface or on solid material of the same thickness, so that the indentor is perpendicular to the surface being tested. Grasp the instrument firmly between the legs and point sleeve. Apply a uniform downward force quickly, by Number of Readings This greater variation may be caused mainly by the difference in hardness between resin and filler materials in contact with the small diameter indentor.
There is less variation in hardness readings on harder materials in the range of 50 Barcol and higher and considerably more variation in the 2 Licensed by Information Handling Services D FIG. On homogeneous materials, five readings are needed to maintain a variance-of-average of 0. On reinforced plastics, in order to maintain a variance-of-average of 0.
Values in Units of Barcol Hardness Material.
ASTM D 2583
Barcol Hardness ASTM D2583