QB/T1811-1993 Leather Water Vapor Permeability Test1

This standard specifies the test principle, test equipment, sample preparation, test procedure, calculation and test report height of leather under standard conditions. This standard applies to all leathers. Reference standard GB/T4689.1 Parts and marks of leather laboratory samples GB/T4689.2 Air conditioning test principle of test pieces for leather physical property testing Under certain temperature and humidity conditions, the leather test piece is fixed on the mouth of the moving test bottle , The test bottle is filled with solid desiccant. When the test bottle moves, the water vapor is absorbed by the solid desiccant through the leather test piece. Weigh the test bottle within a specified time, and it can be determined that the water vapor passes through the leather and is dried during this period. The weight absorbed by the agent. Sample 1. According to the No. 10 sample part specified in GB/T4689.1, remove the sample with a knife die. 2. Air conditioning the sample according to the provisions of GB/T4689.2. Test step 1. Put half of the freshly dried silica gel (59.0±0.5)g is put into the test bottle, the sample is fixed on the bottle mouth with the face inward, then the test bottle is fixed on the test bottle holder, and the instrument is started. 2. Use a vernier caliper to measure the inner diameter of the bottle mouth of the second test bottle in two mutually perpendicular directions, and mark the average diameter d. Accurate to 0.1mm.3, if necessary, between the bottle mouth and the test piece Add a washer or apply a layer of beeswax, or take other anti-leakage measures. 4. After the instrument has been rotated for 16 hours, stop and remove the first test bottle. Put the other half of the freshly dried silica gel (59.0±0.5) g into the second test bottle, remove the sample on the first test bottle as soon as possible and fix it on the second test bottle, using the face inward. 5. Weigh the second test bottle, note the weighing time, and then fix the second test bottle on the instrument. 6. When the instrument rotates for 7 hours, stop, remove the test bottle, weigh, and record the weighing time. Test result P=7369m/(d?×t) In the formula: P——Water vapor permeability, mg/(cm??h);m——Mass added by weighing the bottle twice, mg;d——The diameter of the bottle mouth, cm;t——The time interval between two weighings is small. Test report The test report includes the following contents: a, the name and source of the sample to be tested; b. the arithmetic mean of the results of each measurement; c. the preservation of the sample and the test conditions; d. Factors affecting.

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