Mechanical Applications

We supply carbon and graphite components to the automotive and household appliance industries, as well as to mechanical engineering companies. Our customers include not only manufacturers of compressors, vacuum and other pumps, sealing systems and sliding elements, but also processors of semi finished products and producers of injection mouldings.

In addition, we market graphite foils and sheets made from expanded natural graphite under the trademark Flexifoil, which are used for applications in the automotive and industrial sealing sectors.

Axial Sliding Seal Rings

Coidan Graphite Products use carbongraphite,  electrographite and silicon carbide sliding seal rings for mechanical seals used for various types of pumps and devices depends on conditions in which these materials work. According to this usage it is necessary to decide on a suitable material and impregnation. The conditions which specify the type of material and impregnation of particular applications depend on several technical parameters and demands such as the temperature during the application, pumped and sealed medium and its chemical properties - (acid, alkaline and neutral), friction (wet running, mixed and dry running). Impermeability and wear resistance are the most frequent demands achieved by the impregnation which are chosen in accordance with chemical properties of medium and a counterface. Both material types - carbon and silicon carbide can be used individually or they can work in combination (carbon - silicon carbide ; silicon carbide - silicon carbide).

Material: carbon, electrographite, reaction bonded silicon carbide

Impregnations: resin, antimony, tin, white metal

  • sliding and sealing rings
  • sliding and sealing rings for mechanical seals
  • sealing rings for vacuum pumps, compressors and pumps

Axial sealing rings applications:

  • chemical industry with chemically aggressive media
  • petrochemical industry, refinery and oilrigs
  • pharmaceutical industry ( hygienically suitable impregnation)
  • food industry (hygienically suitable impregnation)
  • sewage tanks
  • circulation pumps for cooling in atomic power plants
  • cooling water pumps in cars

Excellent properties of these materials can be used in following applications in which they exceed common sealing materials:

  • usage of these products in applications without lubricants
  • seals can be applied in dry running applications
  • useful properties of these materials in applications where other materials cannot be installed owing to the danger of corrosion, e.g.acids, hydroxides, steams and gases
  • for use in liquids which lack any marked lubricating effect, e.g.water, water solutions, petrol etc.
  • the medium to be sealed must not be contaminated by lubricants
  • for sealing applications which are exposed to thermal fluctuations or thermal shocks
  • specific properties of these materials provide permanency of form and thermal stability up to extreme temperatures

The most suitable counterface materials are:

  • silicon carbide
  • tungsten carbide
  • aluminium oxide
  • stellite
  • hard metal
  • grey cast iron
  • alloyed and unalloyed steel and nitrided
  • ceramic
  • glass

Used materials: KU 116, KU 117, KU 118, KU 212, KU 511, GU 118, GU 212

 

Axial and Radial Sliding Bearings

axial and radial sliding bearingsMaterial: carbon, electrographite, reaction bonded silicon carbide

Impregnations: resin, antimony, white metal

  • sliding bearings
  • sliding bearings used for hot water and cold water pumps, industry pumps, chemical pumps, high-pressure gear-pumps and other types of pumps where carbon materials are applied
  • carbon bearings for various types of machines and devices

Axial-radial sliding bearing applications:

  • chemical industry with chemically aggressive media
  • petrochemical industry, refinery and oilrigs
  • pharmaceutical industry ( hygienically suitable impregnation)
  • food industry ( hygienically suitable impregnation)
  • sewage tanks
  • circulation pumps for cooling in atomic power plants
  • high-pressure gear-pumps

Excellent properties of these materials can be used in following applications in which they exceed common materials:

  • use of these products in applications without lubricants
  • useful properties of these material in applications where other materials cannot be installed owing to the danger of corrosion, e.g.acids, hydroxides, steams and gases
  • good usage in liquids which lack any marked lubricating effect, e.g.water, water solutions, petrol etc.
  • specific properties of these materials provide permanency of form and thermal stability up to extreme temperatures
  • for sealing applications which are exposed to thermal fluctuations or thermal shocks
  • excellent properties of these materials in water applications for hot water pumps in which common sealing materials corrode

The most suitable counterface materials are:

  • silicon carbide
  • tungsten carbide
  • aluminium oxide
  • hard metal
  • grey cast iron
  • alloyed and unalloyed steel and nitrided
  • glass
  • ceramic

Used materials: KU 116, KU 118, KU 212, KU 511, GU 118, GU 212

 

Segmental Sealing Rings, Piston Rings

segmental sealing rings, piston ringsMaterial: electrographite

Impregnation: resin, antimony

  • segmental seal rings
  • segmental rings for sealing water turbine shafts
  • segmental seal rings for compressors
  • piston and guide rings for oil-free piston compressors

Applications for radial-axial seal piston and segmental rings:

  • sealing of ventilator shafts
  • sealing of ships´ equipment – compressors and pumps
  • sealing of water turbines – Francis and Kaplan
  • sealing of oil-free compressors

Excellent properties of these materials can be used in following applications in which they exceed common materials

  • good properties for dry running applications with high operating temperatures
  • useful chemical properties of these materials do not cause the corrosion in aggressive media e.g. acids, hydroxide, steams and gases
  • specific properties of these sealing materials in applications in which metal sealing materials cannot be used

Material grades: GU 111, GU 118, GU 212

 

Sealing Rings, Guide Bearings and Steam Joint Rings

guide bearings and steam joint ringsAs far as seal rings and guide bearings for steam heads it is necessary for the seal ring with concave and convex surface to be impermeable as well as to seal the vapours and heating-oil on steam head. Carbon material is suitable for all of these applications. The choice of impregnation depends on technical parameters such as the temperature, chemical composition of medium in which these materials work and also the type of material which the counterface is made of. The most common are antimony and resin impregnations

Material: carbon, electrographite

Impregnations: resin, antimony

  • rings with ball surface for sealing the steam heads
  • guide bearings and rings for steam heads

Applications of rings with concave and convex sealing face and guide bearings:

  • paper industry - sealing of steam heads
  • rubber industry - sealing of steam heads
  • textile industry
  • plastic production

Excellent properties of these materials can be used in following applications in which they exceed common materials

  • advantageous usage in applications for concave or convex sealing of vapours and heating-oils
  • specific properties for compensation of swinging, vibration and oscilation
  • excellent properties of these materials in all known friction applications from wet running, through dry running to mixed media
  • usage of these materials at high temperatures and pressures of sealed medium and steam head
  • good sliding properties of materials at high temperature and pressure
  • another advantage is counterface wear resistance to these materials
  • good properties in applications where permanency of form as well as thermal shock resistance are required

Materials grades: KU 118, KU 212, GU 118, GU 212

 

Metal Sleeved Rings and Bearings

metal sleeved rings and bearings Material: carbon, electrographite

Impregnation: resin, antimony

  • Metal sleeved sliding rings and bearings

Applications of axial-radial sliding rings and bearings: 

  • chemical industry with chemically agressive media
  • petrochemical industry, refinery and oilrigs
  • pharmaceutical industry ( hygienically suitable impregnation )
  • food industry ( hygienically suitable impregnation )
  • sewage tanks
  • circulation pumps for cooling in atomic power plants
  • high-pressure gear-pumps

Excellent properties of these materials can be used in following applications in which they exceed common materials

  • good usage in liquids which lack any marked lubricating effect, e.g.water, water solutions, petrol etc.
  • metal sleeved materials make possible the maintenance of a very small sealing
    clearance with the shaft and this remains constant irrespective of temperature
  • Metal sleeved materials fitted in chambers are stronger

Material grades: KU 118, KU 212, GU 118, GU 212

 

Vanes and Guide Strips

vanes and guide stripsMaterial: carbon, electrographite

Impregnation: resin, antimony

  • sliding vanes
  • sliding and guide strips
  • sealing plates
  • dosing valves

Vanes, sliding and guide strips applications:

  • printing machinery
  • packing machinery
  • textile machinery
  • pumps for medical purposes
  • centrifugal pumps
  • mobile compressores
  • pumps delivering fresh air
  • drink vending machines ( wet running )
  • kerbside pumps ( wet running )
  • machinery for transport of loose materials e.g. cement

Excellent properties of these materials can be used in following applications, in which they exceed common materials

  • advantageous usage of these materials in dry running applications in compressors and vacuum pumps
  • advantageous usage of these materials in wet running vane-type pumps if the liquids being pumped have poor lubricating properties

The most suitable counterface materials are:

  • Aluminium oxide
  • Hard metal
  • Grey cast iron
  • Alloyed and unalloyed steel and nitrided
  • Carbon
  • Electrographite

Material grades: KU 118, KU 212, GU 118, GU 212

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Coidan Graphite Products Ltd, Kirk Hammerton, York. YO26 8DQ | 01423 330492 | | www.coidan.com