Fire proof sealing strip: due to the expandability and high temperature resistance of expandable graphite, expandable graphite has become an excellent sealing material and is widely used in fire proof sealing strip. There are mainly two forms: the first is to mix, vulcanize and shape expandable graphite materials with rubber materials, inorganic flame retardants, accelerants, vulcanizing agents, reinforcing agents, fillers, etc. to make expandable sealant strips of various specifications, which are mainly used for fields such as fire doors and fire windows. This expandable sealing strip can block the flow of smoke from beginning to end in normal temperature and fire; The other is to use glass fiber tape as the carrier to bond expandable graphite to the carrier with a certain adhesive. The shear resistance provided by the carbonized substance formed by this adhesive at high temperature can effectively prevent the sliding of graphite. It is mainly used for fire doors, but it cannot effectively block the flow of cold smoke at room temperature or low temperature, so it must be used together with the sealant at room temperature.
Flame retardancy of plastic materials: expandable graphite is a good flame retardant for plastic materials. It is non-toxic and pollution-free. It can achieve ideal flame retardancy when used alone or mixed with other flame retardants. When reaching the same flame retardant effect, the amount of expandable graphite is far less than that of ordinary flame retardant. Its principle is: at high temperatures, expandable graphite expands rapidly, suffocating the flame. At the same time, the graphite expanded material generated by expandable graphite is covered on the surface of the substrate, isolating thermal radiation and oxygen contact. The acid radical in the interlayer is released when it expands, which also promotes the carbonization of the substrate, so as to achieve good results through a variety of flame retardant methods.