This standard specifies the test instrument, sample preparation, test steps and result calculation of the water permeability test method for pressure-sensitive adhesive tapes. This standard is applicable to the determination of water permeability of pressure-sensitive adhesive tapes with a width of not less than 50 mm. GB/T 15330-1994 Water permeability test method for pressure-sensitive adhesive tapes GB/T15330-1994 Standard download decompression password: www.bzxz.net

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Test method for water penetration rate of pressure-sensitive tapes
Test method for water penetration rate of pressure-sensitive tapes1 Subject content and scope of application
GB/T15330-94
This standard specifies the test instrument, sample preparation, test steps and result calculation of the test method for water penetration rate of pressure-sensitive tapes. This standard applies to the determination of water penetration rate of pressure-sensitive tapes with a width of not less than 50mm. 2 Terminology
-The ability of a tape to penetrate water per unit area within a specified time. Water penetration rate (WPR)-
3 Principle
The pressure-sensitive adhesive tape is tightly attached to a test plate containing a desiccant to form a test piece. Weigh it, then soak it under a certain water pressure for a specified time and then weigh it again. The water penetration rate is calculated based on the increase in its mass. 4 Apparatus and Equipment
4.1 The test pan shall be made of a nonhygroscopic material with a zero water vapor transmission rate (WVTR). The pan shall have a flat, smooth, rigid flange and the dimensions are shown below.
100 ± 0.5
Test Pan
The mass of the test pan shall not exceed 80% of the leveling capacity used for weighing. 5=0.5 ±12.
4.2 Desiccant, anhydrous calcium chloride that will pass through a sieve with a mesh size of 2.80 mm, dehydrated and activated by heating at 200°C for 2 h.
4.3 Water Container, any container that can be filled with water to a depth sufficient to maintain a 25 mm water column above the specimen. 4.4 The test water shall be distilled or deionized water. 4.5 Balance, graduated to 1 mg.
Approved by the State Administration of Technical Supervision on December 22, 1994 381
Implemented on October 1, 1995
GB/T 15330---94
4.6 Air circulation oven, capable of maintaining a temperature of 49 ± 1°C. 5 Sample preparation
5.1. Sampling shall be carried out in accordance with the product standard.
5.2 At least 3 specimens shall be prepared for each sample.
5.3 The specimens taken from the sample shall be at least 50 mm wide and 155 mm long. 5.4 Before selecting the test specimen, unroll and remove at least 3 layers, but not more than 6 layers, of the outer tape from the sample roll. 5.5 Remove the specimen from the freely rotating roll at a rate of 500 to 750 mm/s. If the tape roll cannot be separated at this rate due to the width of the tape roll or other factors, the sample should be removed at a rate as close to 500 mm/s as possible. 6 Weighing conditions
The ambient temperature during weighing is 23±2°C and the relative humidity is 45%~55%. 7 Test steps
7.1 Prepare not less than 3 test pieces.
7.2 Fill the test pan with anhydrous calcium chloride to a distance of about 3 mm and ensure that the calcium chloride does not contact the adhesive tape. 7.3 Bond the sample to the flange with the adhesive side facing the flange. No bubbles or wrinkles are allowed. Use finger pressure to achieve this point. If the sample material is larger than the sample size, trim the sample material to the size of the flange edge. If the adhesive is missing or the bond to the flange is not strong enough to maintain a seal when exposed and only the water permeability of the channel perpendicular to the surface of the adhesive tape backing is to be examined, a sealing material such as aluminum foil pressure-sensitive tape can be used to ensure that only an area of ​​25 mm × 100 mm is exposed on the flange opening and all edges are sealed. 7.4 Prepare the remaining specimens in the same manner as the first specimen. 7.5 Heat all specimens in an oven at 49 ± 1 °C for 30 min. 7.6 Cool under weighing conditions (Chapter 6) for 30 min and weigh to the nearest 5 mg. This is used as W1 in the equation in Chapter 8. 7.7 Immerse the specimen in water, maintaining 23 to 25 mm of water on the specimen, and place it at 23 ± 2 °C for 48 h. Remove the specimen from the water and remove any visible water on the specimen with a lint-free, absorbent cloth or paper. 7.8 Place the specimen in an oven at 49 ± 1 °C for 30 min. 7.9 Cool for 30 min and weigh under weighing conditions (Chapter 6) to the nearest 5 mg, and use this as Wz in the equation in Chapter 8. 8 Calculation of Results
8.1 Calculate the water permeability (WPR) of each specimen within the adhesive tape area (g/m2) to the nearest 0.05 g/m2·24h as follows: (W2 - W) 24
WPR--water permeability, g/m224h; W--mass of specimen before exposure test, g; W2--mass of specimen after exposure test, g; T-exposure test time, h;
A--opening area of ​​the test pan, m.
9 Test report
The test report shall include the following contents:
GB/T15330-94
Name of manufacturer and name and brand of adhesive tape; production date and batch number;
Whether the edge is sealed;
Each single value and arithmetic mean of the test result; other contents that need to be reported.
Additional remarks:
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Adhesive Standardization Technical Committee. This standard is drafted by the Shanghai Rubber Products Research Institute. The main drafters of this standard are Zhang Wengang, Sun Guoan and Liu Qianling. 386
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