1. The halogen flame retardant of asphalt flame retardant is mainly bromine flame retardant, which has good flame retardant effect, but it will release a large amount of toxic smoke in the flame retardant process, and decabromodiphenyl ether will also produce carcinogens in the combustion process, and the cost is high.

2. The nitrogen-phosphorus flame retardant of asphalt flame retardant generates strong dehydrating agent when heated at high temperature, which dehydrates and carbonizes the asphalt surface, isolates the external combustible gas and heat, and inhibits the combustion. At the same time, it decomposes to generate ammonia and water vapor when heated, and the oxygen concentration in the air is diluted by ammonia, which has a good flame retardant effect. In addition, good thermal stability, poor water solubility, low smoke, low toxicity, economical and practical, is an ideal flame retardant.

3, asphalt flame retardant non-halogen composite flame retardant in the combustion, release combined water, absorb a lot of heat, thereby inhibiting the combustion, combined with water at high temperature and carbon particles further oxidation reaction, reducing the generation of smoke, so as to achieve the dual purpose of flame retardant smoke suppression. Halogen flame retardants are mainly bromine flame retardants, which have good flame retardant effect, but a large amount of toxic smoke will be released during the flame retardant process. Decabromodiphenylether will also produce carcinogens during the combustion process, and the cost is higher.