This standard specifies the general method for testing the oil permeability of packaging materials such as packaging paper, plastic film, composite materials, etc. This standard is applicable to the determination of the oil permeability of packaging materials that use oil-insulating properties. GB/T 16929-1997 Test method for oil permeability of packaging materials GB/T16929-1997 Standard download decompression password: www.bzxz.net
This standard specifies the general method for testing the oil permeability of packaging materials such as packaging paper, plastic film, composite materials, etc. This standard is applicable to the determination of the oil permeability of packaging materials that use oil-insulating properties.

GB/T16929--1997wwW.bzxz.Net
This standard is formulated with reference to the American Society for Testing and Materials (ASTM) F119 "Test Method for Oil Permeability of Flexible Packaging Materials". It is equivalent to it in terms of technical content and the same in terms of writing rules. In order to make my country's oil permeability test method consistent or equivalent with foreign advanced standards as much as possible, and to adapt to the needs of international trade, technical and economic exchanges and the adoption of foreign advanced standards as soon as possible, the reference standards in Chapter 2 are changed to the three current national standards in my country, and the element of accuracy is deleted according to my country's national conditions, while being suitable for my country's actual situation and not hindering the common use of foreign advanced standards.
This standard is proposed by China National Packaging Corporation. This standard is under the jurisdiction of the National Packaging Standardization Technical Committee. This standard is jointly drafted by the National Packaging Product Quality Supervision and Inspection Center (Jinan) and the 621st Institute of China Aviation Industry Corporation.
The main drafters of this standard are: Wu Shangping, Zhou Jiayan, and Luo Xiangji. 271
1 Range
National Standard of the People's Republic of China
Test method for oil transmission rate of packaging material
GB/T16929-1997
This standard specifies the general method for testing the oil transmission rate of packaging materials such as packaging paper, plastic film, and composite materials. This standard is applicable to the determination of the oil transmission rate of packaging materials with oil-proof properties. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB2828-87 Procedure and table for sampling by counting for batch inspection (applicable to inspection of continuous batches) GB2918-82 Standard environment for conditioning and testing of plastic specimens GB6672-86 Measurement of thickness of plastic films and sheets Mechanical measurement method 3 Test principle
The surface of the packaging material folded or unfolded in a certain way is contacted with the oil in the cotton pad, and the time required for the oil to penetrate the material is measured. The oil penetration time is related to the characteristics of the material and its thickness. 4 Test equipment
a) Bottom plate: 50mm×50mm×3mm single-sided frosted glass (one side of which is a polished smooth surface). b) Weight: 50g cylinder with a bottom diameter of 20mm. c) Cotton pad: a disc with a diameter of 20mm.
d) 100mL dropper bottle.
e) Oven: When the test temperature is 40℃ or 60℃, its accuracy is ±1℃. f) Folding plate: rectangular plate, length and width are not less than 75mm, thickness is 10mm metal or glass plate. g) Folding rod: square metal rod with a weight of 5.5kg, side length is 65mm, bottom surface is flat. h) Flat bar: wooden or metal bar, used for initial folding test of specimen. i) Thickness gauge: thickness gauge in accordance with GB6672, used to measure the thickness of specimen. 5 Reagents
a) animal oil;
b) mineral oil;
c) vegetable oil;
d) other oils.
Approved by the State Administration of Technical Supervision on July 29, 1997 272
Implementation on January 1, 1998
GB/T16929--1997
Oil can also be used to replace the above oils to simulate actual use conditions; the recommended oil is to make the results of different tests comparable.
6 Sampling, specimens and test units
6.1 The number and procedure of sampling shall be in accordance with the provisions of GB2828; or sampling shall be carried out in accordance with the provisions of the product standard. 6.2 Flat specimens
Take no less than three specimens with a size of 60mm×60mm. Before sampling, the specimens shall be treated in an environment of (23±2)℃ and relative humidity of (50±5)% for more than 24 hours. Measure the thickness of the specimen at 5 equally spaced points in accordance with the provisions of GB6672, with an accuracy of 3 significant figures, and record the measurement results.
6.3 Folded specimens
Prepare no less than 6 specimens in accordance with the provisions of Article 6.2. Fold 3 of the specimens with the front side facing up and the other 3 with the back side facing up, pre-fold them in the center of the specimen with a flat strip, and make the folding center line parallel to one side of the specimen. Place a 5.5kg metal rod on the initially folded sample, hold for 15 seconds, take out the sample and unfold it; fold another strip in the vertical direction of the same surface, and place the sample under the metal rod for 15 seconds according to the same steps. 6.4 Test unit
No less than 3 samples constitute a test unit. 7 Test steps
7.1 Place the sample with measured thickness on a clean frosted glass bottom plate. To prevent the sample from moving, its size should be larger than the bottom plate. The samples should include flat samples in contact with the test oil in the cotton pad, samples folded inwards and samples folded outwards from the edges. The used frosted glass bottom plate should be fully immersed in chromic acid solution, then rinsed with distilled water and dried to make it completely clean. 7.2 Cut the cotton cloth into discs with a diameter of 20mm to fit exactly under the 50g weight. 7.3 Overlap two cotton cloth discs and place them in the center of the sample. 7.4 Place a 50g weight on the cotton pad, and then heat the entire test unit (glass, sample, cotton pad and weight) to the set temperature (40±1)℃ or (60±1)℃, and keep it for 30min. 7.5 Remove the weight from the oven, add an appropriate amount of test oil to the cotton pad, and let it soak without flowing. If the oil is viscous or solid, heat it to melt it to increase its fluidity. If a volatile solvent is selected, it can be added dropwise regularly. 7.6 Place a 50g weight on the cotton pad soaked in oil. 7.7 Close the oven door and record the time.
7.8 Determine the time interval based on the time required for oil to penetrate (i.e. 15 min for the first hour, 30 min for the next four hours, and then increase the time interval). Take out the sample, cotton cloth and weight from the bottom plate in each test unit, observe the frosted glass surface with a black background, record the position of the weight, and the time when the oil penetration is first observed (such as the light reduction on the frosted glass bottom plate). If no oil penetration is observed, put the test assembly back into the oven.
7.9 Increasing the test temperature can shorten the test time, but the temperature change caused by frequent observation of the sample will change the end temperature. Therefore, in this case, it is necessary to repeat the test, change the interval time, and check the end temperature of each test until the oil penetration time is obtained. 8 Calculation
8.1 Calculate and record the average thickness and standard deviation of each sample measured. 8.2 Record the maximum and minimum values ​​of the oil penetration time and calculate the average oil penetration time. 9 Test report
The test report should at least include the following: a) The name and code of this standard;
b) The type of sample used (i.e., whether it is flat or folded and its specifications); 273
c) The type of grease and reagent used,
d) Test temperature;
GB/T 16929—1997
e) The average thickness and standard deviation of each sample; f) The average, maximum and minimum oil penetration time of the sample. 274
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