ASTM F2227-13(R2021) pdf free download

ASTM F2227-13(R2021) pdf free download.Standard Test Method for Non-Destructive Detection of Leaks in Non-sealed and Empty Packaging Trays by CO 2 Tracer Gas Method
1. Scope
1.1 This non-destructive test method detects pinhole leaks in trays, as small as 50 µm (0.002 in.) in diameter, or equivalently sized cracks, subject to trace gas concentration in the tray, tray design and manufacturing tolerances. 1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
10. Calibration and Standardization
10.1 Before any measurements are made, the apparatus must be calibrated. The calibration procedure is used for overall system checkout, as well as to establish an initial reference profile for simulated pinhole leaks, and to determine test limits for each different tray geometry to be tested using a specific test fixture. The calibration procedure is performed to establish the sensitivity setting of the instrumentation. It is expected that the calibration procedures be carried out fre- quently; typically, at least one or more times a day, preferably at the beginning of every shift. 10.2 Refer to the instrument manufacturer’s operating in- structions regarding preparation ofCalibration Standards, Con- ditioning of Calibration Trays and Instrument Calibration used in establishing baseline settings.
11. Procedure
11.1 Verify that sufficient CO 2 trace gas is available for the tests. Monitor the trace gas supply and functionality of the gas delivery system. 11.2 Select and implement the properly sized test fixture for the trays to be tested. Verify that the instrument and associated test fixture have been calibrated for the trays to be tested. The test fixture is too large when the instrument is unable to detect a calibrated control pinhole leak. 11.3 Adjust the instrument baseline settings determined in calibration. 11.4 Place the tray to be tested into the test fixture making certain that the tray is centered in the fixture and that good sealing contact is made between the tray flange and the fixture incorporated sealing. N OTE 1—The sealing membrane needs to be clean in order to develop a good seal with the sealing flange of the tray. Laboratory conditions may cause dust or debris to be collected on the sealing membrane. These conditions thus will warrant frequent inspection and cleaning of the sealing membrane with a lint-free cloth soaked with a solvent recom- mended by the manufacturer of the equipment.11.5 Close the top cover of the test fixture. 11.6 Start the test. 11.7 Note the pass or fail indicator and record results. Set aside any “failed/defective” trays for further evaluation. Fur- ther evaluation should include re-testing of the tray. 11.8 Select another tray and repeat the testing process.
13. Precision and Bias
13.1 Precision—A round robin study was conducted in 2002, which included three laboratories. Trays with and without pinhole leaks were tested for leaks. The equipment used in this interlaboratory study was the Pac Guard Model 500 available from MOCON. 13.1.1 Two different tray sizes were tested. The large PETE trays had the approximate outside dimensions of 129 mm wide by 167 mm long by 20 mm high (5.1 by 6.6 by 0.8 in.) with an internal volume of 208 mL. The small PETE trays had the approximate outside dimensions of 69 mm wide by 139 mm long by 18 mm high (2.7 by 5.5 by 0.7 in.) with an internal volume of 80.7 mL. 13.1.2 Three sample trays for each of two sizes (six trays) had a 50 µm (0.002 in.) calibrated pinhole (leak), and six similar trays had a plugged pinhole (no leak). 13.1.3 Each sample material was tested at three laboratories, using the same instrumentation. Each tray was tested at the two possible orientations allowed by the instrument. Two other operators subsequently repeated the tests at different times. A grand total of 216 tests were performed, 108 on materials with leaks and 108 on materials without leaks.