1. Definition:
the cladding materials are different metal panels of 0.1MM－0.5MM thick, and the internal cladding materials are made of non-metal materials.
2. Application:
those with simple shapes are applied in pipeline flange and sealing surface of internal-combustion machines, and those with complicated shapes are used in the flange cover of heat exchanger, etc. The general gaskets are 10-25 MM wide and 2MM-8MM thick, and can be used in a maximum work pressure of 6-10Mpa.
3. Types:
Types of sealing gasket |
Applied in |
Metal fully-cladding gasket |
Vacuum sealing position, tower groove flange, valve cover, etc, automobile dynamo |
wave-shaped fully-cladding gasket |
High-temperature pipeline, valve, exhaust pipelines, etc. |
wave-shaped semi-cladding gasket |
Ignition tower flange, manhole, hand hole, pipeline flange, etc |
Round fully-cladding gasket |
Manhole, hand hole, internal-combustion engine, etc. |
Metal double-layer fully-cladding gasket |
High-temperature and high-pressure flange, container flange |
Metal U-shaped cladding gasket |
Pipeline flange, valve etc |
Metal cone-shaped cladding gasket |
Cone parts of air blower |
4. choosing metal sheet:
type |
Shore hardness A±(°) |
maximum temperature (℃) |
type |
Shore hardness A±(°) |
maximum temperature (℃) |
soft steel |
＜140 |
540 |
galvanized steel plate |
＜130 |
--- |
carbon steel |
＜220 |
--- |
Chrome molybdenum steel plate |
＜150 |
620 |
Brass copper |
＜130 |
260 |
Aluminum plate |
＜40 |
425 |
White steel plate |
＜170 |
600 |
Aluminum alloy |
＜150 |
400 |
Copper plate |
＜170 |
600 |
titanium alloy |
＜180 |
540 |
Monel alloy |
＜150 |
810 |
nickel alloy |
＜150 |
760 |
phosphor bronze plate |
＜200 |
--- |
tantalum alloy |
＜150 |
--- |
5. choosing non-metal materials:
materials |
maximum temperature (℃) |
remarks |
blue asbestos plate |
350 |
With over 90% asbestos fiber (blue asbestos) |
asbestos plate (thread, rope, cloth) |
500 |
With over 90% asbestos fiber (chrysotile asbestos) |
asbestos rubber plate |
450 |
High-temperature asbestos rubber plate |
expansion graphite |
500( oxygen environment ) |
Non-oxygen environment of over800℃ |
porcelain fiber plate |
1750 |
--- |
PTFE plate |
260 |
--- |
6. wave-shaped fully-cladding gasket: (mm)
Characteristics: good elasticity, applicable to the sealing positions of low preloaded force, and mainly used in the valves, pressure containers, and tower apparatus, etc of petroleum refining and chemistry devices.
gasket width （W）
outer diameter range（D） |
gradient range（P） |
thickness（T） |
Below 100 |
3 |
3 |
3 |
-- |
|
100￣160 |
3 |
4.5 |
4.5 |
4.5 |
3 |
160￣250 |
4.5 |
4.5 |
4.5 |
6.5 |
3 |
250￣400 |
4.5 |
4.5 |
4.5 |
6.5 |
3 |
400—630 |
4.5 |
6.5 |
6.5 |
6.5 |
3 |
630—1000 |
4.5 |
6.5 |
6.5 |
6.5 |
3 |
1000--1600 |
-- |
6.5 |
6.5 |
6.5 |
3 |
Pressure （y,Mpa）gasket coeficient table (m) of wave-shaped gasket of different kinds
types
|
metal types |
gasket coefficient (m) |
pressure （y）Mpa |
Metal wave-shaped and asbestos line gasket |
aluminum alloy |
2.5 |
20 |
copper and brass copper |
2.8 |
30 |
soft steel |
3.0 |
35 |
Monel alloy |
3.3 |
40 |
Nickel alloy |
3.3 |
40 |
Stainless steel |
3.5 |
50 |
Metal fully-cladding sealing gasket |
aluminum |
2.5 |
20 |
Red copper, brass copper |
2.8 |
30 |
soft steel |
3.0 |
35 |
5Cr--1/2Mo steel |
3.3 |
40 |
stainless steel |
3.5 |
50 |
Metal U-shaped cladding gasket (wave-shaped cladding) (full cladding) (semi-cladding) |
aluminum |
3.3 |
40 |
Red copper, brass copper |
3.5 |
50 |
soft steel |
2.8 |
55 |
5Cr--1/2Mo steel |
3.8 |
65 |
stainless steel |
3.8 |
65 |
Monel alloy |
3.5 |
60 |
Metal round cladding sealing gasket |
aluminum |
3.3 |
40 |
Red copper, brass copper |
3.5 |
45 |
soft steel |
3.8 |
55 |
5Cr--1/2Mo steel |
3.8 |
65 |
stainless steel |
3.8 |
65 |
Monel alloy |
3.5 |
60 |
Metal double-layer cladding sealing gasket |
aluminum |
4.3 |
50 |
Red copper, brass copper |
4.5 |
55 |
soft steel |
4.8 |
65 |
5Cr--1/2Mo steel |
4.8 |
80 |
stainless steel |
4.8 |
80 |
Monel alloy |
4.5 |
70 |
|
