Types of Flanges

Businesses in a variety of industries rely on flanges to join pipes or components together or to keep equipment secured to a surface. When it comes to choosing the best types of flange for your processes, you’ll want to take the time to research the different options...

Threaded Flange

Threaded flanges are probably the most recognisable of all flanges due to their screw thread design that is used to connect it to the pipe. Threaded flanges, also known as screwed flanges (for obvious reasons), require a male and female thread to create a connection...

Slip On Flange

A slip-on flange can also be known as a hubbed flange, which, as the name suggests, has a hub with a very low profile. Why is this important? Because this type of ring type joint gasket has an internal diameter larger than the connecting pipe, allowing you to slide it...

Weld Neck Flange

Also known as tapered hub flanges or high hub flanges, weld neck flanges are a specific type of gasket with a protruding ridge and long neck used to connect pipework and provide you with a high-quality seal. Weld neck flanges, in particular, are a popular choice when...

Nitrile vs Viton® – What is the Difference?

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Aflas vs Viton

When it comes to choosing O ring suppliers in the UK, you’ll find that there are a wide range of materials on offer for you to choose from. Many people find that the options can seem quite overwhelming, with some materials having similar properties but offering...

EPDM Gasket

Both the automotive and construction industries have started to use EPDM gaskets more frequently in recent times. This rubber material is UV light resistant and has many fantastic properties that make this part highly effective for a wide range of processes. Keep...

Metal Gaskets

When comparing gaskets for use within your business processes, you’ll find that these can be made from a variety of materials. Metal gaskets are a very popular option, offering many advantages over other materials. When looking at sealing product options, make sure...

AFLAS o ring

O rings come in many different dimensions, thicknesses, and materials. And it is the various different materials that o rings can be manufactured from that make each o ring unique and suitable for specific applications. In fact, there are hundreds of different types...

O Ring Vulcanization Process

With years of o ring knowledge and experience in o ring vulcanization, we're one of the leading experts in providing the right sealing solution for you. To view our full range, visit our O-ring product page, with a wide selection and something to match every...

See our latest catalogue for all the services we offer.

Marks on the spiral wound gasket

Marks on the spiral wound gasketMarkings on spiral wound gaskets can be vital for manufacturers who use them. Informing you of the size of the gasket and the load the gasket can handle, markings can also show you the pressure classes and suitability to applications.

These markings are essential in helping to make the right decision on gasket choice, as well as providing you with a high level of quality assurance – a prerequisite for high-specification applications.
With the ability to withstand fluctuating temperatures and pressures, a spiral wound gasket is designed to prevent leaks and avoid contamination, with three key elements forming a robust spiral wound gasket:

1 – The outer ring is used to centre the gasket when inserted into the application.
2 – The inner ring – prevents windings from breaking.
3 – The sealing element – the part that creates the actual seal to prevent leaks, incorporating windings and filler materials.

Spiral wound gasket manufacturing process

A versatile product offering incredible sealing properties, spiral wound gaskets are capable of providing a sealing solution in configurations that face extreme temperature and pressure situations.
Spiral wound gaskets are used in multiple applications across a range of industry sectors to prevent leaks and support joints.

Distinguished by various marks that provide further detail about the gasket itself, spiral wound gaskets are manufactured from thin metal strips and combined with non-metallic filler.
They include a locator outer ring within the bolt circle that is used to support the sealing element of the gasket and an inner ring that provides a heat and corrosion resistance barrier that protects the spiral aspect of the seal.

The most commonly manufactured spiral wound gasket is a 316 stainless steel inner ring with a carbon steel outer, combined with graphite filler material.

However, gaskets come in various materials, shapes, and sizes, making them extremely flexible and versatile.

During manufacturing, these gaskets will be marked with the manufacturer’s logo, the manufacturing standard reference, size and pressure class, filler material, winding material, and inner and outer material.

Spiral wound gasket marks

Spiral wound gaskets have several different markings, and it is good to be aware of these as each one provides you with essential information about the gasket itself.

These markings include:

Design Standard, ASME B16.20 – this is the industry standard to which all gaskets should be manufactured. Allowing for easy identification, the design standard shows the gasket’s adherence to set standards and guidelines.

Manufacturers’ information, including name – putting their stamp on the gaskets produced, the manufacturer’s name will typically be located on the right-hand side of the gasket.

Winding and filler material – this information lets you know what the gasket comprises and if it will be suitable for your specific application.

Pressure classification – these markings of spiral wound gaskets will tell you the overall load the gasket can handle. Pressure classes typically come in 7 pressure ratings: 150, 300, 400, 600, 900, 1,500, and 2,500.

Diameter – these markings of spiral wound gaskets will tell you the gasket size, which generally ranges from 3.2mm to 4.5mm, with larger diameters found ranging from 5.5mm to 7mm.

Spiral wound gasket colours – outside rim colours provide you with information about the gasket winding materials, whereas the rim stripe colour indicates the gasket filler material.

For example, the colours for winding materials include:

  • Yellow – 304 stainless steel
  • Green – 316 stainless steel
  • Turquoise – 321 stainless steel
  • Blue – 347 stainless steel
  • Orange – manufactured from Manel
  • Black – Alloy 20
  • Silver – carbon steel
  • Brown – Hastelloy B
  • Beige – Hastelloy C
  • Gold – Inconel
  • Red – Nickel
  • Purple – Titanium

Filler material colours include:

  • Pink – Mica paper
  • Gray – graphite
  • White – PTFE
  • Light green – ceramic

Knowing the basics surrounding spiral wound gasket markings helps you to avoid selecting the wrong gasket for your application, saving you considerable time and money in the long term.

Benefits of using a spiral wound gasket

  • Suitable in fluctuating temperature ranges
  • Apt for high-pressure applications
  • Typically found in valves, pipelines, and pumps

Specialist Sealing Products

At SSP, we design and manufacture the highest quality, professional spiral wound gaskets.

Providing you with state-of-the-art manufacturing, you can rely on our team to provide you with high-quality, perfectly suited gaskets for your specific applications.

We follow set industry standards and provide product and material certifications, including batch numbers, cure dates, and shelf life, with full traceability.

With high-quality controls in place, we ensure integrity and customer satisfaction across all of our products.

To find out more and to see how we can help you today call us at 01535 274 776 or email for further information.

Read the next article: What is an insulating gasket?



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