What is Graphite?
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There are two types of graphite. There is natural graphite and synthetic graphite.
Natural graphite is found in underground deposits, it is mined and it is primarily used as a lubricant and as pencil lead.
Synthetic graphite is a highly engineered, petroleum based, composite material. It was created for industries that needed graphite with improved properties. The various manufacturing processes as well as recipe compositions, determine the final physical and chemical properties of the graphite.
Basically, there are four types readily available synthetic graphite materials. Extruded, vibratory molded, cold molded and isostatically molded. Generally, the extruded and vibratory molded materials are associated with larger particle sizes and lower densities, while cold molded and Iso molded materials are associated with smaller particle sizes and increased densities. These properties, provide a good starting point when deciding what type of synthetic graphite might be needed for a specific application.
What is Iso Molded Graphite ?
The semantics of the phrase relate to the method of manufacturing. ''Iso'' stands for isostatic. This is a term that stands for constant pressure on all sides. Molded means it is cold pressed by molding. In reality, this type of graphite is a cold molded graphite, Iso-statically pressed. The result is a graphite material that has excellent properties, uniformly distributed throughout the entire mass, without having a grain direction. Combine that with high density and small particle size, and the result is a highly engineered material, very strong, with good machinability, and capable of retaining very fine details. It is resistant to high temperatures in controlled environments, electro-conductive and has self lubricating properties.
Technological developments in industries such as solar, EDM (electrical discharge machining), semiconductors, military and aerospace have created high demand for Iso Molded graphite. Manufacturers are using new technologies and improvements to existing manufacturing processes, to design and create the next generation of Iso Molded graphite materials, making them even stronger, denser with exceptional properties.
Iso-Molded graphite materials are a great choice for a lot of special applications; it is designed and manufactured with the intent of offering custom solutions to highly engineered processes.
Extruded and compression molded grades of mechanical carbon-graphite offer excellent corrosion resistance and superior mechanical strength. Extruded rods provide the most economical solution for low load and RPM bushings and bearings. However, for more demanding applications with high speed and load, and particularly for mechanical seals, piston rings and vanes, we recommend using compression molded grades. Both extruded and compression molded carbon-graphite grades can be additionally impregnated with phenolic resin or metals for enhanced strength and durability; or salts for higher temperatures up to 1200°F in air.
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Due to its unique properties, iso-molded graphite is the ideal material of choice for conventional sinker EDM applications. Proper material grade selection is one key component of insuring the efficient use of this modern machining technique. A wide range of materials have been developed over the past decade each designed for specific applications. Materials differ in density, strength, hardness and machinability which can affect metal removal rates, electrode wear, surface finishes and dimensional tolerances.
Machined graphite crucibles, molds, ingots and stoppers for industrial and jewelry applications. Additional custom machining services available. Clay graphite crucibles for non-ferrous metal melting applications. Standard sizes from 3 to 500 lbs.
Extruded and isostatically pressed graphite plates, rods and tubes. Basic characteristics: rigid, brittle, high-temp resistant, electrically conductive, self-lubricating. Isomolded grades have isotropic grain structure, and much finer grain size.
Pure and reinforced flexible graphite sheets, standard gaskets. Carbon based, plain and foiled on one side (FOS) insulation rigid fiber boards for high temperature vacuum furnaces.
Nanographite Graphene precursor Quality graphite powders and lubricants contained in aerosol cans for easy applications. Graphite based lubricants for a variety of applications including bakery oven chain and railroad performance switch plate lubes. High quality graphite based lubricating greases.
High temperature graphite adhesives are unique inorganic formulations for bonding and sealing graphites in design, process and maintenance applications to 5400°F. Graphite based coatings, rated for temperatures up to 2200°F. Formulated for parting of aluminum permanent molds, non-sticking in glass forming applications, and lubrication and stop-off in metalworking and wire drawing. Provides superior release, surface finish and mold protection.
Pyrolytic Graphite is a unique form of graphite manufactured by decomposition of a hydrocarbon gas at very high temperature in a vacuum furnace. The result is an ultra-pure product which is near theoretical density and extremely anisotropic. The material is deposited as graphene and grown onto a substrate giving it a layered composition with anisotropic properties. This means it has different properties across different planes. In the C plane (across its layers) it has low thermal conductivity, acting as an insulator. In the A-B plane (with the layers) it has very high thermal conductivity, acting as a superb conductor. Our pyrolytic graphite discs and plates are available in three different materials: Substrate Nucleated (PG-SN), Continuously Nucleated (PG-CN), and High Conductivity Substrate Nucleated (PG-HT). Continuously Nucleated (PG-CN) material has physical properties 15-20% higher than that of Substrate Nucleated.
Isomolded and isomolded impervious (resin-treated) graphite plates, gas diffusion layers and membranes for manufacturing Proton Exchange Membrane (PEM) fuel cell, Direct Methanol (DMFC) and Phosphoric Acid (PAFC) stacks.
Carbon Fiber Reinforced Carbon Matrix Composites for high temperature applications.
Dryer bearings and assemblies are used in gypsum board, ceiling tile, veneer, plywood, fiberboard, panel and insulation board dryer applications. We supply complete hanger bearing assemblies with carbon graphite full and half bearing inserts, as well as jacketed replacement cartridges for bracket assemblies in silver dot materials as well as other materials. We can custom design holders, brackets, and carbon graphite bearing materials to fit specific needs. These bearings can be supplied for Grenzebach AKI, Gypsum Technologies, Coe, and Babcock type dryers.
Contact us to discuss your requirements of Speical Graphite. Our experienced sales team can help you identify the options that best suit your needs.