Fiberglass safety helmets have excellent flame retardant effects, thanks to their material properties and special processing techniques. The glass fiber in fiberglass material itself is non flammable and has excellent flame retardant properties. When encountering an open flame, fiberglass will not burn or cause the spread of the flame. The resin part is usually modified by adding flame retardants during the production process.

There are various principles of action for flame retardants. One is the endothermic effect, where flame retardants undergo decomposition reactions at high temperatures, absorbing a large amount of heat and lowering the surface temperature of the material, preventing it from reaching the required temperature for combustion and thus suppressing combustion. Another type is the covering effect, where flame retardants form a dense carbonized layer on the surface of the material during combustion. This carbonized layer can isolate the transfer of oxygen and heat, preventing the flame from continuing to spread. Some flame retardants can achieve flame retardancy by capturing the free radicals generated during the combustion process, interrupting the chain reaction of combustion.

Fiberglass safety helmets that have undergone flame retardant treatment will not quickly ignite when exposed to a fire source, but will self extinguish in a short period of time. After the fire source is removed, the flame on the surface of the safety helmet will quickly extinguish and will not continue to burn, causing harm to the user. Moreover, even during the flame retardant process, the safety helmet can maintain a certain structural strength and will not be quickly damaged by combustion, still providing some protection for the head. This enables fiberglass safety helmets to provide more reliable safety protection for users in work environments with fire risks, such as the power and chemical industries.