Hangzhou Sealcon Fluid Machinery Co., Ltd

Carbon Seal

Graphite is an isoform of element carbon. In 1971, the United States studied the successful flexible graphite sealing material, which solved the leakage of atomic energy valve. After deep processing, the flexible graphite becomes an excellent sealing material, which are made into various carbon mechanical seals with the effect of sealing components. These carbon mechanical seals are used in chemical, petroleum, electric power industries such as high temperature fluid seal.

Because the flexible graphite is formed by the expansion of expanded graphite after high temperature, the amount of intercalating agent remaining in the flexible graphite is very small, but not completely, so the existence and composition of the intercalation agent have a great influence on the quality and performance of the product.

The original inventor used concentrated sulfuric acid as oxidant and intercalating agent. However, after being applied to the seal of a metal component, a small amount of sulfur remaining in the flexible graphite was found to corrode the contact metal after long term use. In view of this point, some domestic scholars have tried to improve it, such as Song Kemin who choosed acetic acid and organic acid instead of sulfuric acid. acid, slow in nitric acid, and lower the temperature to room temperature, made from a mixture of nitric acid and acetic acid. By using the mixture of nitric acid and acetic acid as the inserting agent, the sulfur free expanded graphite was prepared with potassium permanganate as oxidant, and acetic acid was slowly added to nitric acid. The temperature is reduced to room temperature, and the mixture of nitric acid and acetic acid is made. Then the natural flake graphite and potassium permanganate are added to this mixture. Under constant stirring, the temperature is 30 C. After reaction 40min, the water is washed to neutral and dried at 50~60 C, and the expanded graphite is made after high temperature expansion. This method achieves no vulcanization under the condition that the product can reach a certain volume of expansion, so as to achieve a relatively stable nature of the sealing material.

Sealcon can produce different carbon ring seals according to different customers’ requirement.

model

M190T

M106K

M180K

M106D

M160C

M160B

material

pure graphite

furan resin

furan resin

antimony carbon

copper alloy

Babbitt alloy

density (g/cm3)

1.8

1.65

1.8

2.3

2.4

2.4

Fractural strength

(MPa)

100

65

80

65

80

65

compressive strength (MPa)

250

230

240

200

250

160

Shaw hardness

92

90

90

80

75

60

porosity (%)

1.2

1.5

1.2

2

2.5

8

Coefficient of heat

expansion (1/℃)

5.5

5.5

5.5

5.5

6

5.5

temperature (℃)

600

210

210

350

350

200


medium

concentration%

pure graphite

furan resin

antimony

copper alloy

Babbitt alloy

hydrochloric acid

36

+

0

-

-

-

sulfuric acid

50

+

0

-

-

-

sulfuric acid

98

+

+

-

-

-

nitric acid

50

+

0

-

-

-

nitric acid

strong


-

-

-

-

hydrofluoric acid

40

+

0

-

-

-

phosphoric acid

85

+

+

-

-

-

chromic acid

10

+

0

-

-

-

acetic acid

36

+

0

-

-

-

sodium hydroxide

50

+

+

-

-

+

potassium hydroxide

50

+

0

-

-

+

sea water


+

+

+

+

+

benzene

100

+

0

+

+

-

ammonia

10

+

+

+

+

-

acetone

100

+

+

+

0

+

carbamide


+

+

+

0

-

carbon tetrachloride


+

+

+

+

+

oil


+

+

+

+

+

gasoline


+

+

+

+

+


+ stable  - unstable  0 middle (between stable and unstable)
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