There are many kinds of gaskets, which can
be divided into three categories: non-metal, semi-metal and metal gaskets.
(1) Non-metallic gaskets.
gaskets are soft, corrosion-resistant and cheap, but have poor temperature and
pressure resistance. It is mostly used for flange sealing of medium and low
pressure vessels or pipes at room temperature and medium temperature.
Non-metallic gaskets include rubber pads,
asbestos pads, asbestos rubber pads, flexible graphite pads and
① Rubber board.
The main materials for
making rubber plate gaskets are natural rubber, nitrile rubber, chloroprene
rubber, etc. In addition, special rubber such as fluorine rubber has also begun
to be used. Rubber is widely used in the sealing of containers and pipelines
because of its compact structure, soft texture, good resilience, easy shearing
into various shapes, low cost and easy to buy. However, it is not resistant to
high pressure, easy to dissolve and expand in mineral oil and not corrode, and
easy to aging and losing resilience at high temperature.
Asbestos materials are wet
asbestos and blue asbestos. Wet asbestos has good heat resistance, alkali resistance,
high tensile strength and poor acid resistance. Most asbestos rubber boards are
made from it. Blue asbestos is not only good in heat resistance, but also good
in acid resistance, so it is mostly used to make acid-resistant asbestos rubber
boards. The normal service temperature of asbestos board is below 550 degrees.
Large diameter low pressure vessels can use asbestos tape or asbestos rope.
When asbestos rope is used, water glass is usually impregnated. Such gaskets
can also be used in medium such as acid and alkali solvents.
③ Asbestos rubber sheet.
sheet is made by pressing asbestos, rubber and fillers. General asbestos fibers
account for 60% - 85%. According to its mixing technology, performance and use,
there are mainly high-pressure asbestos rubber sheet, medium and low-pressure
asbestos rubber sheet and oil-resistant asbestos rubber sheet.
Asbestos rubber sheet has suitable
strength, elasticity, flexibility and other properties. It is convenient and
cheap to make gaskets with asbestos rubber sheet. Therefore, it has been
rapidly promoted and applied in chemical enterprises.
④ Flexible graphite.
Flexible graphite is a
novel sealing material with good resilience, softness and temperature
resistance, which has been rapidly promoted and applied in chemical
⑤ Polytetrafluoroethylene (PTFE).
Polytetrafluoroethylene (PTFE) is known as the "king of plastics"
because of its superiority in chemical resistance, heat resistance, cold
resistance and oil resistance. It is not easy to aging, does not burn, and
absorbs almost zero water. Its compact structure, non-polar molecular
structure, as a gasket, the contact surface can be smooth, non-stick to the
metal flange. In addition to being eroded by molten alkali metals and
fluorine-containing gases, it can resist the corrosion of various acid, alkali,
salt and grease solution media.
Polytetrafluoroethylene gaskets include
pure polytetrafluoroethylene, filled polytetrafluoroethylene or expanded
(2) Semi-metallic gaskets (also known as metal composite gaskets).
Nonmetallic materials have many advantages, such as
good flexibility, compressibility and low bolt loading capacity. But its main
determination is that the strength is not high, the resilience is poor, and it
is not suitable for high pressure and high temperature occasions. So the bonded
metal material has high strength and good resilience. Characteristic of
withstanding high temperature. A gasket which combines the two structures is
formed. It is a semi-metallic gasket.
(3) Metallic gaskets.
> Ring Joint Gaskets are for oilfield and process industry duties.
> Octagonal shape gasket is belong to API 6A R series
> These gaskets are used in pressures up to 10,000 PSI, more than Oval ring joint.
> The oval type is the only gasket that will fit a bottom radiused groove.
> Gaskets and not re-used after torque.
Octagonal Ring Joint Gasket was initially developed for high pressure and temperature applications found in the petroleum industry and is primarily used in the oil field on drilling and completion equipments. However, today this product range can also be found on valves and pipework assemblies, along with some high integrity pressure vessel joints.
> Gaskets and not re-used after torque.
Oval Ring Joint Gasket was initially developed for high pressure and temperature applications found in the petroleum industry and is primarily used in the oil field on drilling and completion equipments. However, today this product range can also be found on valves and pipework assemblies, along with some high integrity pressure vessel joints.
Spiral Wound Gasket can be made from a large selection of alloys and filler materials in a variety of shapes and sizes.
Yaang also provide non-round spiral wound gaskets, manhole and handhole spiral wound, and just inner & outer rings for SWG.
The Spiral Wound Gaskets is suitable for flange, valve, pump, heat exchange etc.
Corrugated/Serrated Gaskets, for ASME standard corrugated gasket.
The CMG gaskets is punched by moulds, the tolerance is strictly control.
Corrugated Metal Gasket are known as Graphonic Gaskets.
Corrugated metal gasket is widely used for pipe flange, pump, valve joint.
We supply the complete corrugated gaskets, and metal core only.
Tel No：+86-18267732328 / Email:[email protected]
Address：Longwan District, Wenzhou, Zhejiang Province, China.
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Yaang Pipe Industry Co., Ltd. is an international supplier of piping solutions for flange, butt welding fittings, socket welding fittings and threaded fittings. Our products are widely used in different industrial fields, including oil and gas, chemical industry, petrochemical industry, power plant, pulp and paper industry, environmental and water conservancy engineering, engineering projects, etc.