BS EN 59 pdf free download
BS EN 59 pdf free download. Glass reinforced plastics — Determination of indentation hardness by means of a Barcol hardness tester.
4.1.4 Depth measuring system, connected to the stem of the indenter which allows a penetration in the range of 0,000 mm to 0,760 mm. It is also connected to a display device which indicates the indentation hardness of the test specimen in Barcol hardness units. A penetration depth of 0,760 mm is equivalent to 0 Barcol hardness units while a penetration depth of 0,000 mm is equivalent to 100 Barcol hardness units. The scale value of the indicator is 1 Barcol unit per 0,007 6 mm penetration depth. 4.1.5 Feet, capable to support the Barcol hardness tester. 4.1.6 Fixing system, capable to adapt the Barcol hardness tester to a stand (optional). 4.2 Calibrated references plates, made from aluminium. 4.3 Smooth glass plate or hardened steel plate 5 Test specimens 5.1 Test surface The testing area shall be smooth and free from mechanical damage (such as scratches or holes).5.2 Test specimen dimensions The thickness of the test specimens shall be at least 1,5 mm. The test area shall be sufficient to have a minimum distance of 3 mm from the test point to the edges of the test specimen or the previous test point in all directions. 6 Calibration 6.1 Direct calibration 6.1.1 Indenter and presser foot All parameters of the indenter and the presser foot are calibrated according to the tolerances and uncertainties given in Table 1 with appropriate calibration devices for the measurement of the lengths and the angle. The Barcol hardness tester meets the requirements of this European Standard when the actual values match the target values within the measurement uncertainty. 6.1.2 Test force Perform the calibration of the test force by means of a force measuring device as a comparison measurement. In this case, the actual values of the nominal values listed in Table 2 are the Barcol hardness unit of the Barcol hardness tester while the force measuring device is used as a reference standard. The Barcol hardness tester meets the requirements of this European Standard when the actual values match the target values within the measurement uncertainty.6.2 Verification Check the device by a measurement on a glass plate or a hardened steel plate so as to obtain a reading of 100 on the display. In addition the calibrated reference plates made of aluminium are used for verification. These reference plates shall be calibrated in a calibration laboratory. The deviation of a measurement on a reference plate is limited to a maximum of ± 2 Barcol units. The deviation of a measurement with the Barcol tester shall be maximum ± 1 Barcol unit. The deviation due to the reference plate and the deviation due to measurement with the Barcol tester are cumulative (so the overall deviation is maximum ± 3 Barcol units). 7 Conditioning and testing atmospheres 7.1 Condition the test specimens before testing in the atmosphere specified in the relevant material specification. If no material specification exists, condition the test specimens in one of those specified in EN ISO 291. For testing in the standard atmosphere of (23 ± 2) °C/(50 ± 2) % RH, a conditioning time of 16 h may be selected. 7.2 Carry out the test in one of the standard atmospheres specified in EN ISO 291, unless otherwise specified in the relevant material specification. When conditioning and testing in the specified standard conditions is not possible, this shall be stated in the test report. BS EN 59 pdf download.
