Custom Spiral Wound Gaskets for Bulk Export from a Reliable Supplier in China

What Are Spiral Wound Gaskets?

Spiral wound gaskets are semi-metallic sealing components used in industrial piping, pressure vessels, valves and heat exchangers with flanged connections. They are manufactured by winding a pre-formed metal strip and a softer filler material such as graphite, PTFE, or ceramic in a V-shaped spiral around a solid metal outer ring, and optionally an inner ring.

This construction combines the spring-like recovery of the metal winding with the conformability of the filler, creating a seal that performs reliably under high pressure, high temperature, and thermal cycling. Spiral wound gaskets are the standard choice for ASME B16.20, API 6A, DIN EN 1514-2 and JIS B 2404 flanges in chemical, petrochemical, refinery, power, marine and offshore systems.

Why Choose Kaxite Spiral Wound Gaskets

Kaxite Sealing is an ISO 9001:2015 certified factory founded in 2015, with 15 spiral winding machines and a monthly capacity of 200,000 pieces. We ship spiral wound gaskets to more than 60 countries with full material traceability.

• ISO 9001:2015 certified factory, founded in 2015, 15 spiral winding machines, 200,000 pcs monthly capacity.
• Full material traceability to Mill Test Certificates (MTC / CMTR) for every batch.
• NACE MR0175 / MR0103 compliant gaskets available for sour service (H2S).
• Third-party inspection by SGS, TÜV or Intertek on request.
• Fast delivery: 7–15 days for standard sizes, 15–25 days for custom orders.
• OEM and custom designs for non-standard flanges, non-rounded shapes and heat exchangers.

Key Features and Advantages

Spiral wound gaskets outperform flat gaskets in medium-to-high pressure, high-temperature and thermal cycling service. Their main advantages are:

• Excellent resilience and recovery: the spiral-wound structure acts like a spring, compensating for flange rotation, minor misalignment and thermal expansion.
• Wide temperature and pressure range: from cryogenic temperatures up to approximately 1000°C (1832°F) and from vacuum to Class 2500 / PN400, depending on metal and filler selection.
• Superior creep relaxation resistance: the metal winding maintains bolt load over time, ensuring a lasting seal throughout the maintenance cycle.
• High blowout resistance: the metallic structure prevents extrusion or blowout under sudden pressure surges.
• Versatility: available in ASME B16.20, API 6A, DIN EN 1514-2 and JIS B 2404 standard sizes, plus custom designs for any flange facing.

Spiral Wound vs Kammprofile vs Ring Joint vs Double Jacket Gaskets

Choosing the right gasket type is the first decision in flange sealing. The table below compares the four most common semi-metallic gaskets used in industrial flanged connections.

Rule of thumb: choose spiral wound for general chemical and petrochemical flanges; choose kammprofile for heat exchangers and high-pressure service; choose ring joint for oil & gas wellhead and API 6A flanges; choose double jacket for low-pressure heat exchangers and vessels.

In-Depth Product Specifications

Kaxite Sealing manufactures spiral wound gaskets to ASME B16.20, API 6A and DIN EN 1514-2 standards. The specifications below guide your selection.

Standard Construction & Dimensions

Our standard gaskets comply with ASME B16.20 and API 6A for raised face (RF) and ring-type joint (RTJ) flanges. Custom designs for flat face (FF), male-female (M/F) and tongue-groove (T/G) flanges are also available.

Material Combinations

Gasket performance is defined by the metal winding and filler pairing. Kaxite Sealing offers a comprehensive selection for specific media, temperature and pressure requirements.

Filler Material Properties

• Flexible Graphite (Grafoil®): excellent thermal and chemical resistance, low creep relaxation, performs in oxidizing atmospheres up to 450°C, non-stick. Continuous service up to 550°C in inert atmospheres.
• PTFE (Teflon®): superior chemical inertness, low friction, ideal for corrosive media and clean systems. Continuous service from -200°C to +260°C.
• Ceramic / Mica / Non-Asbestos: used for extremely high-temperature applications above 500°C where graphite may oxidize. Service up to 1000°C, with good thermal and electrical insulation.

Applications of Spiral Wound Gaskets

• Chemical processing: reactors, columns, heat exchangers, pumps and valves handling acids, bases and solvents.
• Petrochemical and refinery: crude oil, hydrocracking, catalytic reforming and sour gas lines.
• Power generation: high-pressure steam, feedwater and condensate systems.
• Oil and gas: wellhead, pipeline and API 6A flanges, including NACE MR0175 sour service.
• Marine and offshore: seawater, ballast and fuel systems on ships and platforms.
• Heat exchangers: shell-and-tube, plate and air-cooled exchangers with thermal cycling.

How to Select the Right Spiral Wound Gasket

1. Identify the medium. Acids, bases and solvents point to PTFE filler; high-temperature steam and hydrocarbons point to graphite filler.
2. Confirm temperature and pressure. Match the metal and filler to continuous and peak temperatures, and to the flange pressure class.
3. Choose the winding metal. SS304/316 for general service; Alloy 20, Hastelloy, Monel or Titanium for corrosive media.
4. Choose the filler. Graphite for high temperature; PTFE for chemical inertness; ceramic or mica for above 500°C.
5. Select the flange facing. RF or RTJ per ASME B16.20; FF, M/F or T/G for custom flanges.
6. Decide on inner and outer rings. Outer ring is standard; inner ring is recommended for high-pressure, vacuum and high-velocity service.

Frequently Asked Questions

Get a Custom Spiral Wound Gasket Quote

Send us your flange size, pressure class, medium, temperature and target quantity. Our engineers will recommend the right winding metal and filler, and reply with a quotation within 24 hours.