Fire hazards in public spaces pose significant risks, making fire-retardant measures essential for safety. However, due to regional differences in geography and culture, the types and specifications of flame-retardant products vary widely across different areas. To address this diversity, a series of expert discussions were conducted, leading to a standardized approach for evaluating the flame-retardant properties of various products. These evaluations are now categorized as follows:

1. Fire-Retardant Building Materials: When using materials of the same type and structure, if both the thickest and thinnest samples meet specific requirements, it can be assumed that intermediate thicknesses also comply with the required standards. For example, in the case of flame-retardant flooring, if the thickest and thinnest materials meet the necessary level, the materials in between are considered to satisfy the same grade requirements.

2. Flame-Retardant Fabrics: If fabrics of the same material have the highest and lowest surface densities that meet certain criteria, it is reasonable to conclude that those with intermediate surface densities also fulfill the required standards. This ensures consistency in performance across different fabric thicknesses.

3. Flame-Retardant Plastic/Rubber: For products made from the same material, if the thickest and thinnest samples pass the necessary tests, the intermediate thicknesses are generally considered acceptable. It’s important to note that for items like electrical enclosures or switches, samples should be taken from uniform, non-profiled sections. If dimensions are not suitable, appropriate splicing methods can be used to ensure accurate testing.

4. Flame-Retardant Foam: When foam products have the same density, if both the thickest and thinnest samples meet the required standards, it is logical to assume that the intermediate thicknesses also comply. This helps maintain consistent fire resistance across different foam applications.

5. Flame-Retardant Furniture/Components: If large-scale furniture or components have been tested and found to meet a certain level of flame resistance, it is reasonable to infer that smaller versions of the same product will also meet the same standard, provided they are constructed from the same material and follow the same design.

6. Wires and Cables: For cables of the same structure—such as identical inner and outer sheaths, armor layers, filling materials, and insulation—if the largest and smallest diameter cables meet the required fire resistance levels, then all other diameters are assumed to comply as well. This approach simplifies testing while ensuring comprehensive safety coverage.

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