ASTM F2095-07 (R2021) pdf free download.Standard Test Methods for Pressure Decay Leak Test for Flexible Packages With and Without Restraining Plates.
1 .1 These test methods cover the measurement of leaks in nonporous fIlm, foil, or laminate flexible pouches and foil- sealed trays, which may he empty or enclose solid product. If product is enclosed, seals or surfaces cannot he in contact with water, oils, or other liquid.
1.2 These test methods will detect leaks at a rate of 1 x lO sccs (standard cubic centimetres per second) or greater. in flexible packages. The limitation of leak rate is dependent Ofl package volume as tested.
1.3 The following test methods are included:
1.3.1 Test Method A—Pressure Decay Leak Test for Flexible Packages Without Restraining Plates
1.3.2 Test Method B—Pressure Decay Leak Test for Flexible Packages With Restraining Plates
1.4 These test methods are destructive in that they require entry into the package to supply an internal pressure of gas, typically air or nitrogen, although other gases may be used. The entry connection into the flexible package must be leak-tight.
1 .5 For porous packages. see 9.3.
1 .6 The values stated in SI units are to he regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.
4. Summary of Test Method
4.1 Detection of leak paths in flexible packages that have flOflOfOS material surfaces and seals can be accomplished by pressurization of the package to a fixed pressure, shutting off the pressure and connecting a pressure transducer. Observed changes in pressure indicate the presence of leakage paths in the package seals or pinholes in the surfaces. This leak may he represented in decay pressure units or calculated leak rate units. To accomplish this technique. a leak-tight measuring path must he available between the package interior volume and the pressure transducer (see Fig. 1).
4.2 Restraining plates may be used to limit the volume of the pressurized package. Because the sensitivity of these test methods is dependent in part on the internal volume of the package. the effect of restraining plate use is to increase the sensitivity of the test (see Fig. 2). See Appendix XI for further discussion of the effects of restraining plates on these test methods.
5. Significance and Use
5.1 These test methods provide a rapid, simple to apply method to detect small leaks in flexible package seals or walls at the leak rate level of greater than 1 x 1O sccs, thus providing a measure of package integrity. Porous harrier film packages made non-porous with an impermeable film forming coating may demonstrate lateral leakage through the harrier material. Verification of leakage differences from background leakage must be included in validation methods. The use of calibrated hole sizes or orifices may be appropriate to determine leakage sensitivity or harrier integrity for these materials.
5.2 While theoretical leak rate sensitivity can be established by calculation, the test measurement is in pressure units and the measuring instrument must he calibrated, certified, and verified with these units.ASTM F2095 pdf download.