Important Standards: 6 Test Methods for Measuring Limiting Oxygen Index

The Limiting Oxygen Index (LOI) is an important indicator for evaluating the combustion performance of a material and is the minimum oxygen concentration required for a material to begin spontaneous combustion in an oxygen/nitrogen mixture.

 

 

This standard is a method for measuring the oxygen index of solid materials and is applicable to all non-foam and non-gel materials. In the laboratory, the sample is placed in oxygen and a flame is placed over it, the flame is removed at progressive depths and the minimum oxygen content at each depth is determined.

 

This standard is one of the methods used to measure the oxygen index of solid materials and is applicable to a wide range of non-foamy, non-gelatinous materials as well as films, coatings or insulating materials. The experiment exposes the sample to a specified oxygen concentration, retards ignition and determines the minimum oxygen content.

 

This standard applies to the measurement of the combustion properties of plastic materials and parts and is used to evaluate characteristics such as the rate of combustion of the material in response to flame, dropout and self-extinguishing properties. During the experiment, a flame is tested for combustion against a sample placed in a vertical orientation and scored according to the degree of combustion rating.

 

This standard is a method for the burning behavior of building materials and applies to a variety of materials such as wallboard, interior materials, flooring and roofing. The burning behavior of materials is tested in a laboratory using a radiant oven or fire source at a range of oxygen levels.

 

This standard applies to the evaluation of the combustion characteristics of decorative and structural materials in buildings in which the materials are placed in a vertical orientation in an experiment in which the oxygen concentration for spontaneous combustion is measured for a specified period of time.

 

This standard is a method for evaluating the oxygen index of inorganic nonmetallic materials, such as glass, ceramics, and stone. The samples are placed in a combustion chamber with adjustable oxygen content and the combustion time of the samples is measured at different oxygen concentrations.

 

In addition to the six previously mentioned test methods for measuring the limiting oxygen index, there are a number of other test methods that can be used to evaluate the combustion performance of materials.

 

 

This standard is a method for assessing the burning properties of solid materials and is applicable to a wide range of non-metallic materials such as plastics, textiles and wood. In the experiment, the sample is placed under a source of heat radiation and the parameters of heat release rate, smoke generation and toxic smoke production are measured.

 

This standard applies to methods for measuring flame fire potential and fire spread rate of solid materials using a conical radiation furnace. The samples are placed in the laboratory and then the rate of flame spread and changes in fire potential are observed.

 

This standard applies to methods for evaluating the combustion characteristics of solid materials, primarily used in construction and aerospace applications. In the experiment, the sample is exposed to an open flame, and then the degree of combustion, flame spread and smoke production are observed and recorded.

 

This standard applies to the method of measuring the oxygen index of plastic materials, rubber materials and rubber products. In the experiment, the sample is placed in the vertical direction and the ignition and combustion are observed under the specified oxygen concentration.

 

These test methods may have different standards and specifications in different countries and industries, and the appropriate test method can be selected according to needs. These test methods allow the evaluation of key parameters such as combustion characteristics, flame propagation rate, heat release rate, smoke generation, etc. to guide the selection and use of materials and to improve fire safety performance.