GB/T 16266-2019Test method of packaging materials - Contact corrosion (English PDF)

Foreword

This Standard was drafted in accordance with the rules in GB/T 1.1-2009. This Standard serves as a replacement of GB/T 16266-2008 Test Method of Packaging Materials - Contact Corrosion. In comparison with GB/T 16266-2008, except from editorial modifications, the main technical changes are as follows:

---Terms and definitions are deleted (see Chapter 3 in Version 2008);

---The requirements for test environment conditions are added (see Chapter 3);

---The requirements for desiccator's dimensions are modified (see 5.2;

4.2 in Version 2008);

---The requirements for test specimen pretreatment are deleted (see

5.2.4 in Version 2008);

---The operational requirements for rigid or block materials are modified (see

6.2 and 7.3.2; 5.2.2,

6.1 in Version 2008);

---The description of sampling quantity of granular materials is added (see 6.3;

5.2.3 in Version 2008);

---The requirements for test piece cleaning medium and storage time are modified (see 7.1;

5.1 in Version 2008);

1 Scope

GB/T 16266-2019 is the Chinese national standard on test method of packaging materials - contact corrosion, in the field of packaging and distribution of goods. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 18 October 2019 by the State Administration for Market Regulation; Standardization Administration of China, and has been in force since 1 May 2020. Classification: ICS 55.020, CCS A82. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This Standard stipulates contact corrosion test method of packaging materials against the contacted metallic surface. It includes test environment conditions, reagents, test materials, instruments and equipment, samples, test procedures and test report. This Standard is applicable to contact corrosion test of packaging materials against steel and aluminum. The contact corrosion test against the surface of other metallic materials may take this as a reference.

2 Normative References

The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.

GB/T 678 Chemical Reagent - Ethanol;

GB/T 687 Chemical Reagent - Glycerol;

GB/T 699 Quality Carbon Structural Steels;

GB/T 3880.1 Wrought Aluminum and Aluminum Alloy Plates, Sheets and Strips for General Engineering - Part 1: Technical Conditions of Delivery;

GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods;

GB/T 15723 Laboratory Glassware - Desiccator;

GB/T 30435 Electric Gravity Convection and Forced Ventilation Ovens; SH 0004 Solvent Oil for Use in Rubber Industry

3 Test Environment Conditions

Tests shall be conducted at 20 °C ~ 30 °C, and with the relative humidity of not more than 80%.

5 Instruments and Equipment

5.1 Electric Blast Drying Oven Electric blast drying oven shall comply with the requirements in GB/T 30435.

5.2 Desiccator Desiccator shall comply with the requirements in GB/T 15723. The internal diameter of desiccator body: 240 mm.

5.3 Electric Blower Electric blower shall support two purposes

---for cold and hot.

6 Samples

6.1 Flexible Sheet Material Take representative test specimens from different parts of a sample. The dimensions of each test specimen shall be: 75 mm 50 mm. NOTE: flexible sheet material refers to flexible flaky material, for example, sheet of paper, or, thin film.

6.2 Rigid or Block Material Take representative test specimens from the flat surface of a sample. The dimensions of each test specimen shall be: 75 mm 50 mm; the thickness shall not exceed 10 mm. If the sample is smaller than the dimensions of the test specimens, then, multiple samples shall be used. NOTE: rigid material refers to material that is not easily deformed, for example, paperboard, or, timber; block material refers to stereo-structured non-flaky material, for example, foam block, or, rubber block.

6.3 Granular Material Select a sufficient quantity of representative samples. Grind them into granules, till they can pass through 40-mesh standard sieve but cannot pass through 80-mesh standard sieve. Each piece of sample shall be able to cover an area of 50 mm 25 mm; within the area of coverage, no metal test piece shall be exposed. In terms of materials that are not suitable for grinding, each piece of sample shall be able to cover an area of 50 mm 25 mm. Record the test surface, including the part covered by glass slide and the part uncovered by glass slide; whether the uncovered part generates rusty spots, corrosion spots, and forms loosened or granular spots, and discoloration. In addition, describe the quantity, the status, the distribution, and other test phenomena. If necessary, take Appendix A as a reference to evaluate the result of steel test piece and aluminum alloy test piece.

8 Test Report

Test report shall at least include the following content:

a) Test objective;

b) Serial No. of this Standard;

c) Detailed description of test pieces and samples used in test, including the variety, dimensions, quantity and status, etc.

d) Test environment conditions;

e) Test conditions: temperature, time and concentration of aqueous glycerin, etc.

f) Test result (if necessary, include evaluation);

h) Tester's signature;