GB/T 16265-2025Test method of packaging materials - Compatibility (English PDF)

5.2 Reagents and materials

5.2.1 Anhydrous ethanol. GB/T 678, analytical grade.

5.2.2 Water. GB/T 6682, grade 3.

5.2.3 Solid material test piece (hereinafter referred to as test piece). Selected according to the actual contents of the package, with dimensions of 100 mm × 50 mm and a thickness not exceeding 5 mm. If the solid material is metallic, unless otherwise specified, the following materials may be used. - T3 pure copper plate meeting the requirements of GB/T 5231-2022; - 2A12 aluminum alloy plate meeting the requirements of GB/T 3880.1-2023; - zinc-plated passivated steel plate; - cadmium-plated passivated steel plate.

5.2.4 Hook. S-type, made of stainless steel or glass.

5.2.5 Sandpaper. 240 grit, alumina sandpaper.

5.2.6 Silica gel desiccant. Meets the requirements of

5.1.5.1 in BB/T 0049-2021.

5.3 Instruments and equipment Damp heat test chamber. Meets the requirements of GB/T 10586.

5.4 Specimens

5.4.1 The specimens of neutral packaging materials shall be representative. The specimens shall be sealed and stored before the test. The specimens shall be protected from contamination before and during the test.

5.4.2 The specimen dimensions are 150 mm × 150 mm.

5.5.1 Preparation of test pieces

5.5.1.1 Before the test, sand the copper and aluminum alloy test pieces alternately in a perpendicular direction with sandpaper. After sanding, the sanding marks on the test pieces shall be parallel and consistent, with no pits, scratches, or rust on the surface, and no burrs on the test pieces and the edges of the holes.

5.5.1.2 Materials with plating, coatings, or other non-metallic materials do not require processing or polishing; simulants or 100 mm × 50 mm test pieces can be used directly.

5.5.1.3 For prepared test pieces, except for materials that cannot come into contact with ethanol, hold the test piece and degreased cotton (gauze) with tweezers, wash them sequentially three times in three containers containing anhydrous ethanol, then dry them with hot air using a hair dryer, and cool them to room temperature before the test. When it is not possible to test the test pieces continuously, place them in a desiccator containing silica gel desiccant, use them within 8 h, or re-sand and clean them after 8 h.

5.5.2 Tests

5.5.2.1 Four sets of parallel tests, one of which is a blank test. The blank test does not require neutral packaging materials to package the test piece.

5.5.2.2 Package the test pieces with the specimens, ensuring a double layer near the longitudinal centerline and a single layer on both sides of the test pieces, then fold both ends of the test pieces along their length to the double-layered side, and secure the folded layers tightly with string (e.g., nylon rope) along the longitudinal direction of the test pieces.

5.5.2.3 The packaged test pieces shall be vertically suspended in a damp heat test chamber at 39 °C ± 2 °C and a relative humidity of not less than 95 % for 72 h.

5.5.2.4 After the test, unpack the package and inspect the test pieces for signs of corrosion, softening, cracking, blistering, deformation, delamination, or other disease.

5.5.3 Result evaluation Compare the three sets of test pieces from the parallel tests with the blank test piece. If none of the test pieces show disease, or their disease is not more severe than the blank, they are considered compatible. If any set is more severe than the blank, the test must be repeated according to

5.5.1 and 5.5.2.If two or more sets are more severe than the blank, or if a retest still results in one set being more severe than the blank, they are considered incompatible. NOTE. In this document, the appearance of rust spots, pits, or the formation of loose or granular products on the metal surface is considered corrosion; color changes on the metal surface without other corrosion characteristics are not considered corrosion.