Selecting the proper glow wire diameter and material requires consideration of several factors, including test standards, test requirements, type and properties of the material to be tested, etc. The following are some common factors for selecting glow wire diameter and material:

1. Test standard: Different test standards have different requirements for the diameter and material of the glow wire. For example, the ISO 6925 standard requires a glow wire diameter of 0.5mm, while the ASTM D1230 standard requires a glow wire diameter of 0.76mm.

2. The type and characteristics of the material to be tested: Different materials have different combustion properties and heat resistance properties, so glow wires of different diameters and materials need to be selected to meet different test requirements. For example, for thin film materials such as textiles, a glow wire with a smaller diameter is usually selected to better test its combustion performance.

3. Test requirements: Different test requirements require the selection of glow wires with different diameters and materials. For example, for tests that need to test the combustion performance of materials at high temperatures, it is usually necessary to choose glow wires made of high temperature resistant materials.

4. Model and specification of equipment: Glow wire testing machines of different models and specifications may require glow wires of different diameters and materials. Therefore, when selecting the glow wire, it is necessary to consider the model and specification of the testing machine to ensure that the diameter and material of the glow wire meet the requirements of the testing machine.

In short, choosing the appropriate glow wire diameter and material needs to consider multiple factors comprehensively, and select the appropriate glow wire according to the specific test requirements and test standards. Before choosing glow wire, it is best to read the instruction manual of the testing machine and consult a professional for advice.