ISO 6925 is an international standard for the testing of the burning behavior of carpets, which is used to evaluate the burning characteristics and flame propagation properties of carpets under fire conditions. The following is a brief introduction of several common test methods in this standard:
1. Vertical burning test method (GB 8624-2012):
This method is used to evaluate the burning performance of carpet in the vertical direction. The carpet sample is mounted on a vertical specimen holder, the upper part of which is ignited and the burning process is observed. The burning characteristics of the carpet are judged by evaluating indicators such as flame propagation speed, burning follow-up time and burning index.
2. Limited Ignition Source Combustion Test (CEN/TS 13501-1):
This test method uses a small-sized fire source as the burning source to evaluate the burning characteristics of carpets under actual use conditions. Carpet samples are placed near the fire source within a certain distance and the performance of the carpet is evaluated by observing such indicators as burning speed, flame spread and smoke release.
3. Oxygen index test (GB/T 2406.2-2009):
This test method is used to measure the burning performance of carpets under specific conditions of oxygen concentration. A carpet sample is placed in a specific oxygen environment, one side of it is ignited and the burning is observed. The burning characteristics of the carpet are evaluated by measuring the minimum oxygen concentration required for complete combustion of the sample.
4. Smoke Density Test (GB/T 8627-1999):
This test method is used to evaluate the density of smoke produced by a carpet during combustion. A sample of carpet is heated and ignited and the smoke produced is collected and its density measured. The burning characteristics of the carpet are determined by evaluating the rate of smoke generation and the density index.
These are brief descriptions of several test methods commonly used in the ISO 6925 standard for carpet combustion properties. These test methods can be used to evaluate the burning behavior and flame propagation properties of carpets under fire conditions to ensure that carpets comply with relevant safety standards and regulatory requirements.