STANDARD CARBON AND GRAPHITE BRICKS & SHAPES

Carbon and graphite linings have a high mechanical strength, good heat resistance and excellent stability to temperature changes. Of special importance is the universal chemical resistance. In the food processing industries, tasteless and odourless carbon materials are very valuable. As a result, carbon and graphite linings are often used within harsh chemical environments.

In many chemical processes, the apparatus and reaction vessels must be protected against the acidic and caustic materials used in the processes. Apparatus linings made from ceramic or synthetic plastic type materials are often unsuitable, since they may not withstand chemical attack, high temperatures or sudden temperature changes. Alkaline solutions and hydrofluoric acid are of great importance in chemical technology, but they rapidly destroy equipment linings not made of carbon containing materials.

STANDARD BRICKS

SHAPES

GENERAL APPLICATION INFORMATION

PHYSICAL AND MECHANICAL PROPERTIES
  • Good dimensional stability (low thermal coefficient of expansion)
  • Good heat conductivity
  • Good corrosive resistance
  • Good temperature resistance
  • Good self-lubrication
  • Good frictional characteristics
  • Good machining characteristics
  • Low weight
OPERATING TEMPERATURES

The temperature resistance in an oxidizing atmosphere can be specified as 500°C maximum for TYGRAF materials. In a non-oxidizing atmosphere the temperature resistance is determined by the final graphitizing treatment of each individual grade (e.g. upper application limit for graphite is approximately 3000°C). Temperature resistance is also affected by various impregnations. In the case of resin impregnation the maximum operating temperature is 180°C, for lead impregnation 200°C and antimony impregnation 500°C.

DIMENSIONS
(UNLESS OTHERWISE SPECIALLY AGREED)

a. Machined pieces e.g. tubes are manufactured in accordance with: DIN 7168 rough.

b. For special dimensions, e.g. hand moulded bricks no tolerances can be quoted and have to be agreed upon.

Besides the TYGRAF-T, TX and  TXH grades, other grades of carbon and graphite in the form of beams or tubes etc., for special chemical construction applications can be supplied. The technical data of these other grades are available on request. On principle, any size and shape can be produced. Moulding methods can be block pressing, extrusion pressing, vibrating and ramming. Hand moulded bricks, both complicated and simple in form are made in the TYGRAF-T, TX and TXH grades. It is recommended to contact us when projects in this field are being planned.

Special sizes and bricks with convex radii can also be made in suitable quantities. To allow us to check the feasibility of manufacture, both quantity requirements and dimensioned drawings should be supplied.

TOLERANCES
(UNLESS OTHERWISE SPECIALLY AGREED)

a. Machined pieces e.g. tubes are manufactured in accordance with: DIN 7168 rough.

b. For special dimensions, e.g. hand moulded bricks no tolerances can be quoted and have to be agreed upon.

Besides the TYGRAF-T, TX and  TXH grades, other grades of carbon and graphite in the form of beams or tubes etc., for special chemical construction applications can be supplied. The technical data of these other grades are available on request. On principle, any size and shape can be produced. Moulding methods can be block pressing, extrusion pressing, vibrating and ramming. Hand moulded bricks, both complicated and simple in form are made in the TYGRAF-T, TX and TXH grades. It is recommended to contact us when projects in this field are being planned.

Special sizes and bricks with convex radii can also be made in suitable quantities. To allow us to check the feasibility of manufacture, both quantity requirements and dimensioned drawings should be supplied.

THE USE OF ACID RESISTANT CEMENTS
In acid protection and apparatus construction the use of suitable cement is of the utmost importance. This is also important when using our CECOLIT bricks. In many cases the stability of our carbon and graphite material is greater than that of the cement used. Thus, when checking the stability and suitability of the possible carbon or graphite materials, the stability of the cement to be used in the particular application should also be checked so that full advantage can be obtained from the properties of our products.
In the choice of suitable cement, e.g. phenolic or furan resin based, we will gladly give our experience and advise on suppliers of cements, which we do not produce ourselves.
CHEMICAL STABILITY

TYGRAF-T carbon bricks are extremely insensitive to all acids, provided they have no strongly oxidising properties. TYGRAF materials also show the same excellent resistance to attack by highest concentrations of alkaline solutions. Alternating acid and alkali conditions are withstood by this carbon material and they are also unaffected by corrosive salt solutions. TYGRAF-T carbon brick linings are thus particularly suitable for chemical processes which involve various temperature and concentration cycles.

The stability of TYGRAF-T, TX and TXH to various chemicals is given in the following table. It is pointed out that there is no difference in stability between TYGRAF-T and TX. Because of its higher density and lower porosity TYGRAF-TX is recommended in surroundings where erosion and oxidation occur. TYGRAF-TXH is impregnated with phenolic resin, and is resistant to oxidising acids up to 170° C. TYGRAF-TXH is unsuitable for strongly alkaline media.
Tynic