What is a gasket ?

What is a gasket ?

A gasket is a stationary sealing material that maintains airtightness or liquid tightness. Material made of paper, rubber sheet, or copper sheet, which is placed between two planes to strengthen the sealing material, and is a sealing element arranged between static sealing surfaces to prevent fluid leakage.

Since it is for fixing, it is fixed with bolts or special equipment and maintains airtightness and liquid tightness.

For example, if it is a flange gasket, it is fixed by sandwiching the flange gasket between the flanges with bolts, and if it is a sanitary joint, it is fixed by sandwiching the ferrule gasket between the ferrule parts with a special clamp. To do.

Depending on the material of the gasket, deterioration may be accelerated, or it may melt.



The gasket is a mechanical seal between two objects, usually used to prevent pressure, corrosion, and natural thermal expansion and contraction of pipes between two things and leakage. Since the machined surface cannot be perfect, the irregularities can be filled with spacers. Gaskets are usually made from sheet materials such as backing paper, rubber, silicone rubber, metal, cork, felt, neoprene, nitrile rubber, fiberglass, or plastic polymers such as Teflon. Gaskets for specific applications may contain asbestos.

A washer is a hole (usually in the middle) of a thin plate (usually round) used to distribute the load thread fastener. Other uses are spacers, springs ( Belleville spacers, wave spacers), wear pads, pre-display devices, and lock devices. Rubber gaskets are also used in faucets (valves) to cut off the flow of liquids or gases. Rubber or silicon gaskets can also be used to reduce fan vibration. Usually, the outer diameter of the gasket is about twice the inner diameter.


Gaskets can be divided into non-metallic gaskets, metal gaskets, and metal-non-metallic composite gaskets according to their materials and structural characteristics. Each type can be subdivided into several types.

Non-metallic gasket

·    Rubber gasket

·    Non-asbestos fiber rubber gasket

·    Flexible graphite metal composite gasket

·    PTFE gasket

·    PTFE coated gasket

·    Other types of non-metallic gaskets


Metal-non-metal composite gasket

·    Wave gasket

·    Metal wound gasket

·    Metal tooth compound gasket

·    Metal Clad Gasket

·    Metal corrugated composite gasket

·    Other types of metal composite gaskets

Metal gasket

·    Metal flat gasket

·    Metal corrugated gasket

· Metal-toothed gasket

·    Metal ring gasket

·    Metal lens spacer

·    Metal O-Ring Gasket

Among them, the metal ring gasket can be divided into

·    Octagon Ring Pad

·    Oval Ring Pad

·    Type RX and BX self-tightening gaskets

Material classification

The washer is the part between the connector and the nut, generally a flat metal ring.

Non-metallic gaskets Non-metallic gaskets are gaskets made of non-metallic materials such as asbestos, rubber, synthetic resin, and PTFE. A non-metallic jacket gasket non-metallic jacket gasket covered with a layer of synthetic resin and other non-metallic gaskets.

Semi-metallic gaskets are made of metal and non-metallic materials, such as spiral wound gaskets and clad gaskets. a Spiral wound gasket is a gasket made of a V-shaped or W-shaped cross-section metal belt clip, non-metallic belt, or spiral wound. 1) inner ring The metal ring is set on the inner ring of the wound gasket. 2) The outer ring is the metal ring set on the outer ring of the wound gasket. b Metal cladding

Metallic gaskets are gaskets made of metals such as steel, aluminum, copper, and nickel.

A spiral wound gasket is a gasket wound with a metal belt (usually a V-shaped steel belt) and a non-metallic belt into a ring. The metal belt and the non-metallic belt are alternately wound. Because of its good elasticity, it is widely used in petrochemical and chemical. In the flange sealing structure of electric power and other industries, according to the specific position, a steel ring can be added to the inner or outer layer of the gasket to locate or strengthen it.