In the field of material combustion performance testing, the cone calorimeter is the core equipment, and the choice of gas is directly related to the accuracy and reliability of the test results. So, what kind of gas is used in the cone calorimeter?

Common gas types

The cone calorimeter mainly uses nitrogen and oxygen. Nitrogen, as an inert gas, is often used in experiments to protect the internal components of the instrument, prevent key components from being oxidized in a high temperature environment, and ensure the stable operation of the equipment. Oxygen is the key gas to simulate the combustion environment of materials. The essence of material combustion is a violent oxidation reaction with oxygen. By precisely controlling the flow of oxygen, the combustion state of materials in actual fires can be truly reduced, and key parameters such as combustion heat and mass loss rate can be accurately determined.

Gas selection basis

The choice of gas needs to be closely related to the purpose of the experiment. If basic research on material combustion performance is carried out, it is necessary to simulate real fire scenarios. High-purity oxygen is the first choice, which can provide sufficient oxidants for material combustion and make the test data more realistic. If emphasis is placed on instrument maintenance and basic performance testing, nitrogen can effectively isolate oxygen, protect the core components of the instrument, and prolong the service life of the equipment.

Gas usage requirements

There are strict standards for gas purity. The purity of oxygen generally needs to reach more than 99.5%, and the purity of nitrogen also needs to meet about 99.9%. Too many impurities will interfere with the combustion reaction and cause distortion of test data. At the same time, the gas supply needs to be stable and the flow control is accurate. Through the matching flow adjustment device, the gas supply is stable during the experiment, providing a reliable environment for the test.

Mastering the gas selection points of the cone calorimeter is the key to ensure the accurate experiment and the stable operation of the equipment. Reasonable selection and standardized use of gas can make the cone calorimeter maximize its effectiveness and provide strong support for the study of material combustion performance.