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Semi Metallic Gaskets

Spiral Wound Gasket

Product description

Spiral Wound Gaskets [SWGs] belong to the group of semi-metallic gaskets.

They consist of thin metal strip which are embedded between layers of non-metallic filler material. The metal sheets and layers of filler are alternately wounded in continuous spiral forms which gives this gasket its name.

Spiral Wound Gaskets are the most common used gaskets in diverse industrial applications. They are manufactured in a wide range of material, styles and sizes. They are commonly used in the oil and gas-, chemical-, petrochemical-, food industry and as well in conventional- and nuclear power plants. Their main goal is to prevent leaks through flanged joints even under severe temperature and pressure fluctuations.

Spiral Wound Gaskets can be used in the condition with low and fluctuating bolt loads. Basically there are three elements that constitute a spiral wound gasket, according to requirements related to operating circumstances, different types might be used. Spiral wound gaskets are proven to have advantages related to high-temperature/pressure applications and are often used in corrosive environments. Another positive aspect is that they also show improved sealing performance although with increased roughness of the sealing surfaces of flange.

Following three elements are constituting a Spiral Wound Gasket

Outer ring: Commonly known as a guide ring or centering ring. The outer ring of a spiral wound gasket is usually made of austenitic-/ or carbon steel depending on its planned application. The key purpose of the outer ring is to center the gasket within the bolted flange joint and is also providing the blow out resistance.

Inner ring: The inner ring plays a key role as it prevents windings from buckling inside the flanged connection. Without the inner ring, buckling of sealing material could occur and get sucked into the system, this would lead to a foreign material introduction within the system and could cause for example plant shut downs in the worst case. Furthermore it provides the gasket a greater resistance against thermal shocks.

Sealing element: This element of the spiral wound gasket creates a tight seal to prevent leaks. The sealing element encompasses both windings and filler material. In general, spiral wound gaskets use a flexible graphite filler material rated for high temperatures. The graphite as filler material also helps the gasket to avoid flange distortion and joint misalignment. Another common filler material is PTFE (Polytetrafluoroethylene). However, PTFE is not suitable for use in high-temperature applications. The most widely used winding materials are Stainless Steel and Monel.

Product types

  • Basic construction type [Style R]: It consists of the metal strip and filling materials [the so called winding ring]. This type is suitable for tongue and groove-, male and female or flat face and recess flanges [this type does not come with an inner or outer ring].
  • With inner ring type [RIR]: Consists of the metal strip and filling materials [the so called winding ring] and an inner retaining ring which increases the axial rigidity and resilience of the gasket. This design can minimize the erosion of the sealing surface. They are suitable for using on male and female flanges.
  • With outer ring type [CG]: Consists of the metal strip and filling materials [the so called winding ring] and an outer center-ring which controls the compression and holds the gasket in its required position.
  • With inner and outer ring type [CGI]: Consists of the metal strip and filling materials [the so called winding ring] an outer- and inner. This type shows a higher resistance against corrosion on the flange faces. Suitable for flat face and raised face flanges and suited for high pressure temperature environments.

Product features

  • Better compressibility and recovery
  • With plastic property, it can adapt to the sealing surface with concave and convex to fill the gap of sealing surface and ensure to keep the better sealing performance under the environment with fluctuation temperature and pressure
  • With better mechanical property of tensile strength and stretch rate
  • With excellent performance of corrosion resistance, lower risk of failure under extreme condition; less expansion under temperature transients
  • It won’t be softening under the condition with high temperature; it won’t be harden shrink under the condition with low temperature
  • With the advantage of enough strength, it won’t be broken under the condition with heavy load; it won’t be blown out under the condition with high pressure

Materials of Spiral Wound Gaskets

Available Winding Material:

  • SS 304
  • SS 316L
  • SS 321, SS 34
  • Inconel® 600
  • Incoloy® 800/825
  • Inconel® X-750
  • Monel®400 Winding for corrosive environments
  • Hasteloy® C-276,
  • Monel® 400

Available Winding Filler Material:

  • Graphite
  • Ceramic
  • PTFE
  • Non-sintered PTFE

Marking of Spiral Wound Gaskets

Color Code of Spiral Wound Gaskets

Standard Specifications

Most common standards are:

  • ASME B 16.20, MSS SP-44
  • API 605
  • DIN 2632-2638
  • DIN EN1514-2
  • EN1514-2

However, the gaskets can as well be customized according to the customers requirements. In case of need specific drawings and or material test sheets are to be provided. 

Required Information in case of Order 

  • What Gasket Type you need
  • Dimensions
  • Pressure Class
  • Winding Material
  • Filler Material
  • Outer Ring Material
  • Inner Ring Material

Type of Certificate you require [2.1 / 2.2 / 3.1 / 3.2]


Industrial application

  • Nuclear- and Conventional Power Plants
  • Petrochemical- and chemical Industry
  • Refineries, Steam lines
  • Process Industries

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