BS EN 993-10:2020 pdf free

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BS EN 993-10:2020 pdf free.Methods of test for dense shaped refractory products Determination of permanent change in dimensions on heating.
BS EN 993-10 Two measuring devices may be used, either the dial gauge apparatus (method 1) or callipers (method 2).  Dial gauge apparatus, (Method 1), consisting of a dial gauge or micrometer with an accuracy of 0,01 mm, mounted on a stand which has a surface ground base plate (see Figure 1), and a test piece carrier (see Figure 2), with three studs of equal length t 0,01 mm to support the test piece and two pins to locate it. The dimensions of the locating pins shall be as shown in Figure 2. The under surface of the carrier shall be ground flat. A diagonal mark shall be inscribed at one corner to enable a rectangular test piece to be placed symmetrically on the studs. A cylinder of known length shall be used to calibrate the device.The carrier shall be used to support and locate the test piece so that measurements with the dial gauge or micrometer before and after firing are made at the same points on the test piece  urface.Calibrate the length-measuring device (see 5.4) using the cylinder of known length. Place the test piece on the carrier, with the 60 mm dimension vertical. For rectangular test pieces, align one corner with the diagonal mark on the carrier, and mark this corner so that the test piece may be placed in the same position for measurement after firing. Mark cylindrical test pieces adjacent to the diagonal mark.Measure the length of the test piece in four positions, to the nearest 0,01 mm, by moving the carrier with the test piece over the base plate. For rectangular test pieces, the four positions are located on the diagonals, between 20 mm and 25 mm from each corner. For cylindrical test pieces, the positions are 10 mm to 15 mm from the perimeter, on two diameters at right angles.Record each measuring point.Linear measurement by Vernier callipers (Method 2) Measure the length of the test piece using the Vernier callipers (see 5.4.3) to the nearest 0,02 mm.Measure the length at three positions using the measuring points shown in Figure 3. Mark the positions at which the measurements are made, either with refractory paint or by cutting small grooves across the edges of the test pieces (see Figure 3).Sliding test pieces in and out of the jaws of callipers can lead to wear of the surface of the jaws,although such an effect will be reduced because the length change is calculated by the difference of two measurements made with the same callipers. To minimize such wear, the test pieces should be placed carefully in the open jaws in contact with the upper fixed jaw, and the lower jaw moved up until contact is made.BS EN 993-10 pdf download.

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