There are two kinds of material oxygen index test methods: iso4589-2 room temperature oxygen index and iso4589-3 high temperature oxygen index.
Iso4589-2-2017 room temperature oxygen index test method replaces iso5689:1996, iso4892-1996 / AMD 1:2005 test standard
ISO 4589-2 test principle oxygen index: describes the test method for maintaining the minimum oxygen concentration required for combustion under specified test conditions by feeding a mixture of oxygen and nitrogen at 23℃±2℃.The result is defined as the OI value.
En4589-2 describes the test method for the material to maintain the minimum combustion temperature required for combustion under specified test conditions by feeding a mixture of oxygen and nitrogen with an oxygen concentration of 20.9%.
2. Ignition method
Methods A - top - plane ignition method and B - diffusion ignition method
The test method
Both rigid and soft materials can be tested in a particular fixture.The fixture is mounted in a transparent combustion cylinder containing a mixture of oxygen and nitrogen that flows upward in a laminar flow.Room temperature test is usually carried out after the sample state is adjusted.When the top surface is lit, the flame contact surface will last for a maximum of 30s, and move away every 5s to observe whether the sample is burned.This ensures that the temperature of the sample is not too high and the OI value is low.On diffusion ignition, the flame contacts the vertical side of the sample approximately 6mm downward.In the film test, wrap the film around the bar at 45°, remove the bar to fix the sample end and cut off the top by 20mm.
Ii. Iso4589-3-2017 high-temperature oxygen index test method replaces iso5683-3:1996 test standard
The test method
The method will support combustion of small vertical specimens at temperatures of 25℃ and 150℃ under specified test conditions.The results are defined as the oxygen index value at the test temperature, which is a typical value of the actual temperature that the plastic material may experience at the overheated use site.Methods are provided for self-supporting test materials in the form of 10.5mm thick vertical bars or thin plates at test temperatures.These methods are applicable to solids, laminates, or porous materials with apparent densities greater than 100 kg/m.These methods are also applicable to certain porous materials with apparent densities less than 100 kg/m.A method for testing flexible thin plate or thin film M is provided.Vertical support material.This section of ISO 4589 also includes A method (see appendix A) to determine the temperature of small and medium-sized vertical air samples at an oxygen index of 20.9 under specified test conditions.The results were defined as flammability temperature (ft), and the method was limited to measurements below 400℃.This method is not suitable for materials with oxygen index <20,9 measured at 23℃.