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Comparison and Analysis of Vertical Combustion ASTM D6413 and GB/T5455 Standard
Both ASTM D6413 and GB/T5455 standards are used to test the vertical burning characteristics of fabrics. The two test standards are basically the same in terms of test scope, test process, and evaluation indicators. There are obvious differences in the design of the fire tube, the ignition time and other aspects. It can also be seen that during production acceptance and commodity sales, both parties to the transaction need to discuss product testing standards in order to unify the testing and evaluation system. 1. The general test procedures of ASTM D6413 and GB/T5455 have the following four aspects: 1. Preparation of test equipment. Including the adjustment of the flame length, the adjustment of the position of the flame nozzle (the flame nozzle should be located directly under the test fabric), and the adjustment of the distance between the flame nozzle and the end of the sample. Generally, it should be ignited for a period of time before the test. This is not only to adjust the flame height, but also to remove the air remaining in the pipeline. 2. Preparation of the sample: The sample is cut and added to the sample holder, hung on the sample rack, and suspended in the box. 3. Test: Including the ignition test within the standard time, recording the continuous burning time and smoldering time by manually touching the stop switch, recording the burning state of the sample, whether there is a droplet phenomenon, etc. 4. Record and evaluation: This part sorts out the recorded content during burning. At the same time, according to the respective standards, hang a heavy hammer on one side of the burning fabric, and slowly lift the other end by hand. The tear length at the burning point is called the carbonization length or Damage length. 2. The main differences between ASTM D6413 and GB/T5455 are as follows: 1. Box and parts: GB/T5455 box and parts: There are slight differences in the size of the box in the two standards, and the ignition device is completely different. There are also differences in sample fixtures, but this does not affect the completion of the test and the completeness of the equipment functions. 2. The ignition device and the ignition mechanism are different: one is to control the gas access time. When the time specified in the standard is reached, the gas is turned off and the external source combustion stops. One is to move the flame position. After the standard ignition time, the flame position is far away from the sample. It can be seen from the ignition device of ASTM D6413 that there are two vent pipes and two flames will appear, one for ignition and one for igniting the sample. 3. Judgment of damage length: The test is carried out according to the most apex of the burning part, and the test is carried out based on this, but there are differences in size. GB/T5455 details the different weights applied by different fabrics.
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