Carbon Seal
Carbon shaft sealhas a long history. 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.
Selection of Carbon Seal Material
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.
Specification of Carbon Ring Seal
Sealconcan 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) |
||||||
Fractural strength |
100 |
65 |
80 |
65 |
80 |
65 |
(MPa) |
||||||
compressive strength (MPa) |
250 |
230 |
240 |
200 |
250 |
160 |
Shaw hardness |
92 |
90 |
90 |
80 |
75 |
60 |
porosity (%) |
2 |
8 |
||||
Coefficient of heat |
6 |
|||||
expansion (1/℃) |
||||||
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)
As a carbon seal ring manufacturer, we will offer more types of hydrocarbon pump mechanical sealfor customers, if you have needs, please contact us.
在线联系供应商
Other supplier products
PTFE Seal | Polytetrafluoroethylene (PTFE), also known as teflon/teflon or plastic king, is a copolymer of tetrafluoroethylene monomer. First, it was developed... | |
Stainless Steel Seal | Stainless Steel is short for stainless acid resistant steel. It is called Stainless Steel with weak corrosive medium or Stainless Steel, such as a... | |
Flygt Mechanical Seals FEU-22 | Replacement for: FEU-22 upper parts for flygt 2070 pump FEU-22 upper parts for flygt 2102-40 pump FEU-22 upper parts for flygt 3082 pump Featur... | |
Flygt Mechanical Seals Plug in Plastic | Replacement for: Plug in seals with plastic housing Features: Original Sweden design cartridge design big stock wilo pumps ITT pumps Flyg... | |
O.E.M MECHANICAL SEALS | With mechanical seal factory, Sealconis able to design and manufacture a wide range of OEM mechanical seals. Our aim is to improve product quality ... |
Same products
Seal | 卖方: 台州嘉盛橡塑有限公司 | Natural disasters, political instability, or economic downturns can disrupt the supply of raw... | |
Silicon Carbide Pump Seals Silicon Carbide Bearings For Canned Motor Pump | 卖方: Zhejiang Guanyu Sealing Parts Co., Ltd. | Silicon carbide pump seals products Corrosion Resistance: The silicone material is highly resist... | |
DOUBLE CARTRIDGE MECHANICAL SEALS | 卖方: Hangzhou Sealcon Fluid Machinery Co., Ltd | The double cartridge mechanical sealis a pre-assembled package of seal components, which make the... | |
TC Seal | 卖方: Hangzhou Sealcon Fluid Machinery Co., Ltd | TC materials have features of high hardness, strength, abrasion resistance and corrosion resistan... | |
Stainless Steel Seal | 卖方: Hangzhou Sealcon Fluid Machinery Co., Ltd | Stainless Steel is short for stainless acid resistant steel. It is called Stainless Steel with we... |