The secret of expandable graphite lies in its expanding and therefore flame-retardant effect. Natural graphite has a special layer structure that allows the intercalation of molecules between the graphite layers. In case of fire, the graphite layers are pushed apart like an accordion. This effect is used to form a protective intumescent layer or to partition off cavities and feedthroughs, depending on the application. The extension of the fire is slowed as a result and underlying materials are protected.
Halogen-free and registered according to REACH
as a flame retardant on a mineral basis, expandable graphite is not just free of halogens but also REACH-compliant
Easy to apply and highly efficient
expandable graphite can be integrated as flakes or a master batch, and has a flame retardant effect even at a low degree of filling due to even distribution
Works on its own and as a synergist
expandable graphite can be used as the sole flame retardant additive or works as a synergist in combination with other additives, such as APP or ATH
Expandable graphite is typically integrated into composites, compounds, master batches and coatings. Fire protection systems, foam products and plastic components are just a few of the many possible applications in which expandable graphite is used as a flame retardant today. However, the requirements for the flame retardant additive are different for each base material and every application.
The start temperature, expansion rate and particle size are among the key selection criteria. With foam products, the pH value plays a particularly important role so as not to impair the reaction of the two components.
has to be matched to the processing temperature and ambient temperature
determines the properties of the expandable graphite grade
determines the density and thickness of the protective intumescent layer
should be high in case ash components interfere with the application
determined by the application or manufacturing process
in the neutral range, prevents chemical reactions and corrosion
The right additive or special raw material specification exists for every application. Let’s find the appropriate solution together. Our team and I are happy to help you.
Expandable graphite is used primarily as a halogen-free flame retardant additive, but further processing into conductivity additives or films and moulded parts made of natural graphite foam is possible as well.