ASTM D3078-02 (R2021)e1 pdf free download.Standard Test Method for Determination of Leaks in Flexible Packaging by Bubble Emission.
1.2 Small leaks may not he detected by this procedure. Viscoelastic effects on the products, or entrapped air, become significant and prevent passage through small openings. Positive pressure inside the pouch after the vacuum is drawn may force the product to plug small leaks. The size of the leak that can be detected is dependent upon the products contained, the nature of the packaging material, and the test parameters selected.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and arc not considered standard.
1.4 This standard does not purport to address all of the safety coizcerns, if any, associated will, its use. It is thee responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine thee application of regulatory limitations prior to use.
1 .5 This international standard was developed in accordance with international recognized principles on standardication established in the Decision on Principles for the Dc ‘elopmenr of In tern ational Standards, Gu ides and Recommnendations issued by the World Trade Oiganization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions:
3.1.1 leak—any opening in a flexible package that, contrary to intention, either allows the contents to escape or substances to enter.
4. Apparatus
4.1 Vacuum Chamber—Any transparent container capable of withstanding approximately one atmosphere pressure differential, fitted with a vacuum-tight cover. A vacuum gauge, an inlet tube from a source of vacuum, and an outlet tube to the atmosphere shall be connected to the chamber cover. The inlet and outlet tubes shall be equipped with hand valves. Attached to the underside of the cover shall be a transparent plate that will closely approximate the inside dimensions of the container and he such a distance from the top of the container that when it is two-thirds filled with fluid, the attached plate will be positioned I in. (25 mm) under the fluid.
5. Materials
5. 1 Immersion Fluids—Use an immersion fluid which does not degrade the package being tested. Fluids with a low surface
tension are generally more sensitive. Examples include water, water treated with a wetting agent. denatured alcohol, and mineral oil. Other possible fluids arc listed in Practice E515 and Recommended Practice F98.
6. Sampling
6.1 The number of specimens used in the test sample may be varied according to the nature of the product, its cost, its size, and whether the specimens are taken from a production line in a normal packaging operation, or are few in number, or are to he used only for purposes of comparative evaluation of procedures or materials.ASTM D3078 pdf download.