EXPANDABLE GRAPHITE · 2018-03-13 · EXPANDABLE GRAPHITE Fields of application Insulation foam,...
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EXPANDABLE GRAPHITE Fields of application Insulation foam, e.g. PU-rigid foam plates Soft foams, e.g. in furniture, mattresses Carpets, textiles Coatings, plastic foils Rubber products, e.g. conveyer belts Pipe closing systems Due to the layered structure of graphite, atoms or small molecules can be introduced between the carbon layers (intercalation). During this process a so-called expandable graphite salt or GIC (Graphite Intercalation Compound) is produced. Outstanding expandable graphite grades have a high proportion of intercalated layers. Usually sulphur or nitrogen compounds are used as intercalation agents. Under the influence of heat the layers separate like an accordion, and the graphite flakes expand. Depending upon the grade of material expansion can commence at as low as 180°C and can occur suddenly and rapidly. In the case of free expansion the final volume can be several hundred times greater than the initial volume. The properties of expandable graphite, i.e. initial expansion temperature and degree of expansion, are primarily defined by the quality of intercalation (proportion of intercalated layers) and by the intercalation agent. Rainer Sturm / pixelio.de Rainer Sturm / pixelio.de Contact: Graphit Kropfmühl / AMG Mining AG Langheinrichstr. 1 94051 Hauzenberg Germany Tel.: +49 8586 609-178 Fax: +49 8586 609-112 [email protected] www.gk-graphite.com Graphit Kropfmühl A member of Advanced Metallurgical Group N.V.
Transcript of EXPANDABLE GRAPHITE · 2018-03-13 · EXPANDABLE GRAPHITE Fields of application Insulation foam,...
E X PA N D A B L E G R A P H I T E
Fields of application
Insulation foam, e.g. PU-rigid foam plates
Soft foams, e.g. in furniture, mattresses
Carpets, textiles
Coatings, plastic foils
Rubber products, e.g. conveyer belts
Pipe closing systems
Due to the layered structure of graphite, atoms or small molecules can be introduced between the carbon layers (intercalation). During this process a so-called expandable graphite salt or GIC (Graphite Intercalation Compound) is produced. Outstanding expandable graphite grades have a high proportion of intercalated layers. Usually sulphur or nitrogen compounds are used as intercalation agents.
Under the influence of heat the layers separate like an accordion, and the graphite flakes expand. Depending upon the grade of material expansion can commence at as low as 180°C and can occur suddenly and rapidly. In the case of free expansion the final volume can be several hundred times greater than the initial volume.
The properties of expandable graphite, i.e. initial expansion temperature and degree of expansion, are primarily defined by the quality of intercalation (proportion of intercalated layers) and by the intercalation agent.
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Contact:Graphit Kropfmühl /
AMG Mining AGLangheinrichstr. 1
94051 HauzenbergGermany
Tel.: +49 8586 609-178Fax: +49 8586 609-112
Graphit Kropfmühl
A member of Advanced Metallurgical Group N.V.
07/
2013
Advantages
Excellent flame retardant effect with low material use
Halogen-free
Free of heavy metals
Non-polluting
Suitable for a wide range of applications
Reduces fume formation
Low cost
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Expandable graphite as a flame retardant
One of the principal applications of expandable graphite is as a flame retardant. As a result of the heat of a fire the graphite expands and creates an intumescent layer on the surface of the material. This retards the spread of fire and minimises one of the most harmful effects of combustion, the creation of toxic gases and fumes.
Expandable Graphite (GIC) Expansion process (lab) Exfoliated Graphite
Technical data - GK bestseller
Grade Carbon Expansion Start Temperature Particle size ³Content in % in cm /g
ES 100 C10 min. 92 100 200 - 230 75% < 150 µm ES 250 B5 min. 90 250 200 - 230 80% > 300 µm
ES 350 F5 min. 98 350 200 - 230 80% > 300 µm
Fire reaction
Expanded graphite
Thermal decompositionzone
Basic material
Flammable gas
HeatO2
Contact:Graphit Kropfmühl /
AMG Mining AGLangheinrichstr. 1
94051 HauzenbergGermany
Tel.: +49 8586 609-178Fax: +49 8586 609-112
A member of Advanced Metallurgical Group N.V.
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