Flexible graphite is a soft sheet form of compressed natural graphite made from exfoliated mineral flake(crystalline) graphite. Due to its flexible texture, it is referred to as flexible graphite to distinguish it from other forms of graphite materials: flake graphite, amorphous graphite, artificial graphite (hard graphite), graphite electrodes, graphite/carbon fiber, etc.

　　standard flexible graphite sheet product suitable for most industry applications. As gasket material, it is usually fabricated into Graphite Laminate, reinforced graphite sheet and widely used in fluid sealing applications: flange gasket, spiral wound gasket, heat exchanger gasket, etc. It can also be used as solid lubricant in metal stamping and forming applications, or as heat liner in industry furnaces and other heating devices.

　　Sometimes flexible graphite is also referred to by a manufacturer's brand name like grafoil. Flexible graphite sheet is made with pure expanded graphite. standard flexible graphite sheet product has a high purity of 99.0% carbon content. Higher carbon content gives the flexible graphite foil better chemical resistance, better thermal conductivity, and better sealing ability.

　　graphite gasket sheet is made with pure flexible graphite sheet reinforced with glass fiber insert. The both sides are pure graphite sheet, the reinforced material is one layer or two layers of glass fiber. The graphite layer and glass fiber are jointed together with glue bonded. Reinforced graphite gasket is cut or molded from our reinforced graphite sheets. Inner and outer eyelet with SS304 or SS316.

　　Graphite gaskets having excellent corrosion resistance, high temperature resistance, excellent compressibility and recovery, widely used for piping, valves, pumps, pressure vessels, heat exchangers, condensers, generators, compressed machine, exhaust pipes, chillers. Graphite reinforced gasket can also cut into any shape of complex gaskets such as water gauge gasket, full face flange gasket and automotive cylinder head gasket.

　　Reinforced materials: stainless steel tanged, stainless steel foil, tinplate, wire mesh, glass fiber and and Aluminium foil.

　　Graphite sheet is a new kind of heat conduction and heat dissipation material. It can transmit heat evenly in two directions. It can shield the heat source and components and improve the performance of consumer electronic products.

　　With the acceleration of the upgrading of electronic products and the growing demand for thermal management of mini, high integration and high performance electronic equipment.

　　This new solution of natural graphite, high radiation efficiency, small space occupation, light weight, uniform heat conduction along two directions, eliminate the "hot spots", performance of shielding heat sources and components and improvement of consumer electronic products.

　　Heat dissipation principle of graphite sheet:

　　A typical thermal management system consists of an external cooling device, a radiator, and a thermal cross section.

　　The important function of the fins is to create the most effective surface area on which the heat is transferred and the external cooling medium is removed. The graphite heat sink is used to distribute heat evenly over the two-dimensional surface, which effectively transfers the heat and ensures that the component operates at the temperature under which it is applied.

　　Features: the surface can be combined with metal, plastic, self-adhesive and other materials to meet more design functions and needs.

　　Excellent thermal conductivity: 150 ~ 1200W/m.k, better than metal heat conduction.

　　Light quality, only 1 to 1.3 of the proportion of soft, easy to operate.

　　Low thermal resistance. Black color. The thickness of the graphite sheet: 0.012-1.0mm glue: 0.03 mm ultrathin 0.012MM

　　Thermal conductivity; planar conduction; 300-1200W/m.k; vertical conduction; 20-30 W/m.k

　　Temperature resistance 400 DEG C

　　Low thermal resistance: thermal resistance is 40% lower than aluminum, 20% lower than copper

　　Light: 25% lighter than aluminum, 75% lighter than copper

　　High thermal conductivity: graphite heat sink can be smoothly attached to any flat and curved surface, and can be cut in any form according to the needs of customers.

　　Graphite flake main use:

　　Applied to notebook computers, high-power LED lighting, flat panel display, digital cameras, mobile phones and personal assistant equipment, etc..

　　The graphite sheet foil , usually, we named it “graphite paper”, it's made of high pure graphite after high temperature expanded.Graphite sheet foil is a kind of totally new thermal & radiating material, heat conducting evenly along two directions, shielding with heat and component while improving the performance of the consumer electronic products.

　　As a new generation heat spreader material, thermal management graphite sheet foil offers a unique combination of excellent heat stability, weight savings, high thermal conductivity, low coefficient of thermal expansion and anti-corrosion to the thermal management industry. It outperforms the traditional heat spreader materials, such as aluminum, copper and so on.It has the characteristics of high temperature resistance,corrosion resistance and good elasticity.For the smart phone, due to it is as the mobile internet terminal, energy dissipation is high and time remaining is long, it asks relatively larger for the test of hardware, smart phone manufacturers improve thermal dissipation through reasonable design of thermal solution to reduce energy dissipation!

　　Graphite sheet foil has provided valuable thermal solutions in a variety of industries and applications, including handheld communication devices, LCD, PDP, LED, CPU, MPU, automobile electronics, power amplifier and other electronics. It will not only miniaturize the electronic components, but also save the weight, lower the cost, improve the safety, optimize the energy efficiency and prolong the operating life.Ultrathin thin graphite paper thermal interface material is a quite right simple and useful thermal dissipation applied material, it has been widely used in smart phone thermal solution.

　　Our company also can produce flexible graphite roll,flexible graphite tape,99% high carbon content graphite paper in rolls,flat flexible graphite tape and metal mesh reinforced graphite sheet,we can provide the customized graphite sheet/foil/paper/tape products according to the customer’s different requirements and applications.

　　The high thermal conductivity graphite sheet has good thermal conductivity of 800-1900W/MK, it is perfect heat conduction material , it’s made from the new film materials after 3500 degrees Celsius high temperature sintering , it’s light and it’s 1/3-3/4 times of aluminum, 1/5-1/4 times of copper , these high thermal conductivity graphite sheet is easy to processing, it can be bent repeatedly and cut to any shapes.

　　The properties of high thermal conductivity graphite sheet : high thermal conductivity, 1900W/m-K (X-Y axis), 15W/m-K (Z axis); high forming temperature , stable and reliable performance, no aging problem; good flexibility performance, easy to cutting, installation and use; it’s flexible and has light weight and high EMI shielding effectiveness; it meet the EU Rohs instructions and the requirements of no the halogen content and other harmful substances.

　　High thermal conductivity graphite sheet is a revolutionary breakthrough in the thermal conductivity material application field, it has a wide range of application areas, it’s the perfect thermal conductivity of electronic mobile intelligent products. This product can be used in PDP, LCD TV, set-top boxes, notebook computers, projectors, mobile phones, handheld devices and automotive electronics and other fields.

　　Our standard high thermal conductivity graphite sheet size: 210mmX250mm, 225mmX225mm, 260mmX260MM, 260mmX800mm, 300mmX300mm, we also can customize the different thickness and size according to the requirements of our customers.

      Graphite packing rings, also called graphite die-formed ring,is made of flexible graphite sheet.

　　It can be made of pure graphite sheet or reinforced graphite sheet with stainless steel wire,wire mesh,nickel wire,nickel wire mesh etc.Then be compressed in precise tools to the required density.it has square section and also has V-shaped and wedge-shaped section,the rear two kinds style are suitable for high pressure sealing.

　　They are stable and reliable even if under awful working circumstances.and they are usually used with reinforced expanded graphite rings forming a complete set.

　　The graphite packing can be use as packing sealing for valves,pumps and reaction vessels.

　　The standard specification below:

　　Different properties depends on the different reinforced materials.

　　Another product is also called graphite packing ring,but it’s made of graphite packing,and made through various braided graphite packings,the technical data is the same to graphite packings.The reinforced material is also same to the graphite packing.It is widely used in steam valves of powder station,static sealing,high pressure and chemical corrosion,used in the industry such as petroleum equip,power station,chemical industry steelmill etc.

　　Reinforced graphite sheet is made of pure graphite sheet,and it could be processed to Graphite tape, Stuffing, Sealing gasket, Composite plate, Cylinder pad, etc.

　　It’s widely used as sealing elements of pipe,valve,pump,pressure vessel,heat exchanger and condenser,etc.and applied to high temperature and pressure steam,hot water,gases,heat medium,hydrocarbon,organic solvents acids alkalis(pH0-15),LPG,LNG liquefied oxgen,nitrogen and hydrogen etc.

　　The reinforced graphite sheet can be used to make reinforced graphite gaskets,the property of reinforced graphite sheet is much better than the pure graphite gasket.the specification below is the comparison:

　　As to the reinforced material,it can be SS316(0.1mm)the sprint enhance graphite composite board, SS316(0.05mm)reinforced graphite composite board, SS304(0.1mm)the sprint enhance graphite composite board, SS304(0.05mm)reinforced graphite composite board, c.s the sprint enhance graphite composite board, meshed wire reinforced graphite composite board.

　　The reinforced graphite sheet can be process to some types to make the recinforce graphite gasket.

　　1、Basic type graphite composite gasket;

　　2、Inside edge graphite composite gasket;

　　3、outside edge graphite composite gasket;

　　4、graphite composite gasket with inside and outside edge;

　　5、meshed wire reinforced graphite composite gasket.

　　Reinforced by different materials,the graphite sheet it is suitable for pipe, valve, pump, pressure container, heat exchanger, and condensate.

　　What is ultrathin graphite sheet?is it any different from the ordinary graphite sheet?

　　The processing of ultrathin graphite sheet is similar to the ordinary ones:

　　The expanded graphite powder with purity of >98%, put a certain amount of expanded graphite into the hot pressing die,meanwhile,vibrate the die to make the powder dispersed evenly,then place the die onto the powder compressing machine,set the temperature and pressure,and after that,start to heat pressing.keep this situation for a period of time,then get out the graphite sheet and heat it,and make it went through a double roller mill for several times to make finished product.

　　The simple process below:

　　What’s the main application of ultrathin graphite sheet(conductive graphite sheet)?

　　With the development of the information industry and portable electronic products,heat dissipation has become the bottleneck for the continued development of electronic products,the ultrathin graphite sheet has a good performance of electrical conductivity and thermal conductivity,along the direction of crystal lamellae,the thermal conductivity can be more than 2000W/m.K,and it has an adventage of small expansion coefficient and low density,if it could be widely used,then the problem of the shortage of metal and heat dissipation of electronic components could be solved.

　　Through research by SEM,XRD and Raman on the microstructure, crystallite orientation etc. we could know the reason that ultrathin graphite sheet has a good performance of electrical conductivity and thermal conductivity,the microstucture of the ultrathin graphite sheet with high crystallization and crystallite orientation exhibited high anisotropy and the degree of the ordering of the surface carbon atom was closly to that of the flake graphite.

　　Graphite sheet is widely used in the industry of electric power, oil, chemical, instrument, machinery and diamond etc.it’s an ideal new type sealing material and could replace rubber, fluoroplastics and asbestos in using for pipe,pump, valve.

　　With the acceleration of electronic product upgrading,and smaller and smaller and the demand for radiator pipe of high performance electronic devices, the new technology of heat dissipation of electronic products, that is, graphite material heat dissipation has been widely used.this kind of new graphite heat dissipation material take advantage of the heat dissipation efficiency, small footprint, light in weight, heat conduction along the two directions etc.

　　We know that the flexible graphite,like graphite sheet, is made of the natural flake graphite,acturally,the natural graphite need to be further processing to expansible graphite and then to used for flexible graphite.

　　Under appropriate conditions, acid, alkali metal, salt, can be inserted into the graphite layers, and combine with carbon atoms,to form new chemical phase——Graphite layers of compound,this compound could break down instantly when the temperature become fit. expand graphite along the C axis to form a new substances,and that is the expansible graphite.

　　After intercalation, deintercalate, extrusion, pressing,the crystal structure of expansible graphite is still not changed so the chemical stability and corrosion resistance of expanded graphite is good,it has a good stability almost to all of the acid, alkali, salt, organic solvents, oils, etc.it can be applied to pH 0~14.

　　The flexible graphite sheet is only one production of the expansible graphite,it could also used to make expanded graphite yarn, braided graphite tape, braided expanded graphite cloth, braided graphite tube/sleeving, die-formed graphite ring etc.

　　Flexible graphite is a soft sheet form of compressed natural graphite made from exfoliated mineral flake(crystalline) graphite. Due to its flexible texture, it is referred to as flexible graphite to distinguish it from other forms of graphite materials: flake graphite, amorphous graphite, artificial graphite (hard graphite), graphite electrodes, graphite/carbon fiber, etc. Sometimes flexible graphite is also referred to by a manufacturer's brand name like grafoil. Flexible graphite sheet is made with pure expanded graphite. standard flexible graphite sheet product has a high purity of 99.0% carbon content. Higher carbon content gives the flexible graphite foil better chemical resistance, better thermal conductivity, and better sealing ability.

　　Standard flexible graphite sheet product suitable for most industry applications. As gasket material, it is usually fabricated into Graphite Laminate, reinforced graphite sheet and widely used in fluid sealing applications: flange gasket, spiral wound gasket, heat exchanger gasket, etc. It can also be used as solid lubricant in metal stamping and forming applications, or as heat liner in industry furnaces and other heating devices.

　　Graphite gasket sheet is made with pure flexible graphite sheet reinforced with glass fiber insert. The both sides are pure graphite sheet, the reinforced material is one layer or two layers of glass fiber. The graphite layer and glass fiber are jointed together with glue bonded. Reinforced graphite gasket is cut or molded from our reinforced graphite sheets. Inner and outer eyelet with SS304 or SS316.

　　Graphite gaskets having excellent corrosion resistance, high temperature resistance, excellent compressibility and recovery, widely used for piping, valves, pumps, pressure vessels, heat exchangers, condensers, generators, compressed machine, exhaust pipes, chillers. Graphite reinforced gasket can also cut into any shape of complex gaskets such as water gauge gasket, full face flange gasket and automotive cylinder head gasket.

　　Reinforced materials: stainless steel tanged, stainless steel foil, tinplate, wire mesh, glass fiber and and Aluminium foil.

　　The graphite is made of natural flake graphite,after oxide intercalation, the thermal expansion, compression molding. Graphite sheet is one kind of flexible graphite,and it’s invented in 1963. after that,it’s widely used in The United Kingdom,German,Franch and Japan.

　　The natural flake graphite is rich in China,and it’s our advantage to do the research and development on the graphite sheet.

The production method of graphite sheet:

　　Graphite is belong to the hexagonal crystal system,and it has a laminated structure,the Interlayer bonding force is very weak,so we could insert some Molecules and atoms into the interlamination by oxidation,and intermetallic compounds is formed, meanwhile expanding the spacing of layers at this step.then heat to about 1000℃ instantly after water scrubbing the compounds,the compounds between the layers separate and by this way,graphite level was pulled,after these,the graphite particle expand dozens of time rapidly along the C direction,it looks like worm under the microscope,so it’s called vermicular graphite,and also called expanded graphite,it has a great compressibility and resilience.under the pressure of mechanical force,the expanded graphite is molded,it could be put into a mould to molded or roller compaction by roll crushing mill.then the flexible graphite sheet is finished,it could form a plate or coil.

　　The flexible graphite sheet has a good temperature tolerance, corrosion resistance, impermeability and compressibility.it widely used as Gasket and filler under the condition of high temperature and corrosive medium.the graphite sheet which has a high aeolotropism,is also used as heat insulation material and conductive material,because of the thermal conductivity and conductivity of X,Y direction much higher than the Z direction.