Abstract: This paper makes a full comparative analysis of the development process of fire intumescent seals standardization. On this basis, it focuses on the main technical indicators and test methods of the current standards. Taking the expansion ration and smoke density as the breakthrough point, it discusses the suitability of technical indicators and the reliability of test methods, and puts forward the optimization and improvement scheme. The repeatability and representativeness of the test results are significantly improved by the new expansion ratio test scheme and SDR classification evaluation system under different working conditions, and the experimental verification is carried out.

Key words: fire intumescent seal, expansion ratio, smoke density, standardization